1 /* Job execution and handling for GNU Make.
2 Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free
4 Software Foundation, Inc.
5 This file is part of GNU Make.
7 GNU Make is free software; you can redistribute it and/or modify it under the
8 terms of the GNU General Public License as published by the Free Software
9 Foundation; either version 3 of the License, or (at your option) any later
12 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
14 A PARTICULAR PURPOSE. See the GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License along with
17 this program. If not, see <http://www.gnu.org/licenses/>. */
32 /* Default shell to use. */
36 char *default_shell
= "sh.exe";
37 int no_default_sh_exe
= 1;
38 int batch_mode_shell
= 1;
41 #elif defined (_AMIGA)
43 char default_shell
[] = "";
44 extern int MyExecute (char **);
45 int batch_mode_shell
= 0;
47 #elif defined (__MSDOS__)
49 /* The default shell is a pointer so we can change it if Makefile
50 says so. It is without an explicit path so we get a chance
51 to search the $PATH for it (since MSDOS doesn't have standard
52 directories we could trust). */
53 char *default_shell
= "command.com";
54 int batch_mode_shell
= 0;
56 #elif defined (__EMX__)
58 char *default_shell
= "/bin/sh";
59 int batch_mode_shell
= 0;
64 char default_shell
[] = "";
65 int batch_mode_shell
= 0;
67 #elif defined (__riscos__)
69 char default_shell
[] = "";
70 int batch_mode_shell
= 0;
74 char default_shell
[] = "/bin/sh";
75 int batch_mode_shell
= 0;
81 static int execute_by_shell
;
82 static int dos_pid
= 123;
84 int dos_command_running
;
85 #endif /* __MSDOS__ */
88 # include <proto/dos.h>
89 static int amiga_pid
= 123;
90 static int amiga_status
;
91 static char amiga_bname
[32];
92 static int amiga_batch_file
;
97 # include <processes.h>
100 # include <lib$routines.h>
101 static void vmsWaitForChildren (int *);
105 # include <windows.h>
107 # include <process.h>
108 # include "sub_proc.h"
110 # include "pathstuff.h"
111 #endif /* WINDOWS32 */
114 # include <process.h>
117 #if defined (HAVE_SYS_WAIT_H) || defined (HAVE_UNION_WAIT)
118 # include <sys/wait.h>
122 # define WAIT_NOHANG(status) waitpid (-1, (status), WNOHANG)
123 #else /* Don't have waitpid. */
128 # define WAIT_NOHANG(status) wait3 ((status), WNOHANG, (struct rusage *) 0)
129 # endif /* Have wait3. */
130 #endif /* Have waitpid. */
132 #if !defined (wait) && !defined (POSIX)
136 #ifndef HAVE_UNION_WAIT
141 # define WTERMSIG(x) ((x) & 0x7f)
144 # define WCOREDUMP(x) ((x) & 0x80)
147 # define WEXITSTATUS(x) (((x) >> 8) & 0xff)
150 # define WIFSIGNALED(x) (WTERMSIG (x) != 0)
153 # define WIFEXITED(x) (WTERMSIG (x) == 0)
156 #else /* Have `union wait'. */
158 # define WAIT_T union wait
160 # define WTERMSIG(x) ((x).w_termsig)
163 # define WCOREDUMP(x) ((x).w_coredump)
166 # define WEXITSTATUS(x) ((x).w_retcode)
169 # define WIFSIGNALED(x) (WTERMSIG(x) != 0)
172 # define WIFEXITED(x) (WTERMSIG(x) == 0)
175 #endif /* Don't have `union wait'. */
177 #ifndef HAVE_UNISTD_H
189 /* Different systems have different requirements for pid_t.
190 Plus we have to support gettext string translation... Argh. */
194 static char pidstring
[100];
196 sprintf (pidstring
, "%Id", pid
);
198 sprintf (pidstring
, "%lu", (unsigned long) pid
);
203 int getloadavg (double loadavg
[], int nelem
);
204 int start_remote_job (char **argv
, char **envp
, int stdin_fd
, int *is_remote
,
205 int *id_ptr
, int *used_stdin
);
206 int start_remote_job_p (int);
207 int remote_status (int *exit_code_ptr
, int *signal_ptr
, int *coredump_ptr
,
210 RETSIGTYPE
child_handler (int);
211 static void free_child (struct child
*);
212 static void start_job_command (struct child
*child
);
213 static int load_too_high (void);
214 static int job_next_command (struct child
*);
215 static int start_waiting_job (struct child
*);
217 /* Chain of all live (or recently deceased) children. */
219 struct child
*children
= 0;
221 /* Number of children currently running. */
223 unsigned int job_slots_used
= 0;
225 /* Nonzero if the `good' standard input is in use. */
227 static int good_stdin_used
= 0;
229 /* Chain of children waiting to run until the load average goes down. */
231 static struct child
*waiting_jobs
= 0;
233 /* Non-zero if we use a *real* shell (always so on Unix). */
237 /* Number of jobs started in the current second. */
239 unsigned long job_counter
= 0;
241 /* Number of jobserver tokens this instance is currently using. */
243 unsigned int jobserver_tokens
= 0;
247 * The macro which references this function is defined in make.h.
250 w32_kill(int pid
, int sig
)
252 return ((process_kill((HANDLE
)pid
, sig
) == TRUE
) ? 0 : -1);
255 /* This function creates a temporary file name with an extension specified
257 * Return an xmalloc'ed string of a newly created temp file and its
258 * file descriptor, or die. */
260 create_batch_file (char const *base
, int unixy
, int *fd
)
262 const char *const ext
= unixy
? "sh" : "bat";
263 const char *error_string
= NULL
;
264 char temp_path
[MAXPATHLEN
]; /* need to know its length */
265 unsigned path_size
= GetTempPath(sizeof temp_path
, temp_path
);
268 const unsigned sizemax
= strlen (base
) + strlen (ext
) + 10;
272 path_size
= GetCurrentDirectory (sizeof temp_path
, temp_path
);
276 while (path_size
> 0 &&
277 path_size
+ sizemax
< sizeof temp_path
&&
280 unsigned size
= sprintf (temp_path
+ path_size
,
282 temp_path
[path_size
- 1] == '\\' ? "" : "\\",
284 HANDLE h
= CreateFile (temp_path
, /* file name */
285 GENERIC_READ
| GENERIC_WRITE
, /* desired access */
286 0, /* no share mode */
287 NULL
, /* default security attributes */
288 CREATE_NEW
, /* creation disposition */
289 FILE_ATTRIBUTE_NORMAL
| /* flags and attributes */
290 FILE_ATTRIBUTE_TEMPORARY
, /* we'll delete it */
291 NULL
); /* no template file */
293 if (h
== INVALID_HANDLE_VALUE
)
295 const DWORD er
= GetLastError();
297 if (er
== ERROR_FILE_EXISTS
|| er
== ERROR_ALREADY_EXISTS
)
300 /* the temporary path is not guaranteed to exist */
301 else if (path_is_dot
== 0)
303 path_size
= GetCurrentDirectory (sizeof temp_path
, temp_path
);
309 error_string
= map_windows32_error_to_string (er
);
315 const unsigned final_size
= path_size
+ size
+ 1;
316 char *const path
= xmalloc (final_size
);
317 memcpy (path
, temp_path
, final_size
);
318 *fd
= _open_osfhandle ((long)h
, 0);
323 for (p
= path
; (ch
= *p
) != 0; ++p
)
327 return path
; /* good return */
332 if (error_string
== NULL
)
333 error_string
= _("Cannot create a temporary file\n");
334 fatal (NILF
, error_string
);
339 #endif /* WINDOWS32 */
342 /* returns whether path is assumed to be a unix like shell. */
344 _is_unixy_shell (const char *path
)
346 /* list of non unix shells */
347 const char *known_os2shells
[] = {
359 /* find the rightmost '/' or '\\' */
360 const char *name
= strrchr (path
, '/');
361 const char *p
= strrchr (path
, '\\');
364 if (name
&& p
) /* take the max */
365 name
= (name
> p
) ? name
: p
;
366 else if (p
) /* name must be 0 */
368 else if (!name
) /* name and p must be 0 */
371 if (*name
== '/' || *name
== '\\') name
++;
374 while (known_os2shells
[i
] != NULL
) {
375 if (strcasecmp (name
, known_os2shells
[i
]) == 0)
376 return 0; /* not a unix shell */
380 /* in doubt assume a unix like shell */
386 /* Write an error message describing the exit status given in
387 EXIT_CODE, EXIT_SIG, and COREDUMP, for the target TARGET_NAME.
388 Append "(ignored)" if IGNORED is nonzero. */
391 child_error (const char *target_name
,
392 int exit_code
, int exit_sig
, int coredump
, int ignored
)
394 if (ignored
&& silent_flag
)
398 if (!(exit_code
& 1))
400 (ignored
? _("*** [%s] Error 0x%x (ignored)")
401 : _("*** [%s] Error 0x%x")),
402 target_name
, exit_code
);
405 error (NILF
, ignored
? _("[%s] Error %d (ignored)") :
406 _("*** [%s] Error %d"),
407 target_name
, exit_code
);
409 error (NILF
, "*** [%s] %s%s",
410 target_name
, strsignal (exit_sig
),
411 coredump
? _(" (core dumped)") : "");
416 /* Handle a dead child. This handler may or may not ever be installed.
418 If we're using the jobserver feature, we need it. First, installing it
419 ensures the read will interrupt on SIGCHLD. Second, we close the dup'd
420 read FD to ensure we don't enter another blocking read without reaping all
421 the dead children. In this case we don't need the dead_children count.
423 If we don't have either waitpid or wait3, then make is unreliable, but we
424 use the dead_children count to reap children as best we can. */
426 static unsigned int dead_children
= 0;
429 child_handler (int sig UNUSED
)
440 /* The signal handler must called only once! */
441 signal (SIGCHLD
, SIG_DFL
);
444 /* This causes problems if the SIGCHLD interrupts a printf().
445 DB (DB_JOBS, (_("Got a SIGCHLD; %u unreaped children.\n"), dead_children));
449 extern int shell_function_pid
, shell_function_completed
;
451 /* Reap all dead children, storing the returned status and the new command
452 state (`cs_finished') in the `file' member of the `struct child' for the
453 dead child, and removing the child from the chain. In addition, if BLOCK
454 nonzero, we block in this function until we've reaped at least one
455 complete child, waiting for it to die if necessary. If ERR is nonzero,
456 print an error message first. */
459 reap_children (int block
, int err
)
463 /* Initially, assume we have some. */
468 # define REAP_MORE reap_more
470 # define REAP_MORE dead_children
475 We have at least one child outstanding OR a shell function in progress,
477 We're blocking for a complete child OR there are more children to reap
479 we'll keep reaping children. */
481 while ((children
!= 0 || shell_function_pid
!= 0)
482 && (block
|| REAP_MORE
))
486 int exit_code
, exit_sig
, coredump
;
487 register struct child
*lastc
, *c
;
489 int any_remote
, any_local
;
494 static int printed
= 0;
496 /* We might block for a while, so let the user know why.
497 Only print this message once no matter how many jobs are left. */
500 error (NILF
, _("*** Waiting for unfinished jobs...."));
504 /* We have one less dead child to reap. As noted in
505 child_handler() above, this count is completely unimportant for
506 all modern, POSIX-y systems that support wait3() or waitpid().
507 The rest of this comment below applies only to early, broken
508 pre-POSIX systems. We keep the count only because... it's there...
510 The test and decrement are not atomic; if it is compiled into:
511 register = dead_children - 1;
512 dead_children = register;
513 a SIGCHLD could come between the two instructions.
514 child_handler increments dead_children.
515 The second instruction here would lose that increment. But the
516 only effect of dead_children being wrong is that we might wait
517 longer than necessary to reap a child, and lose some parallelism;
518 and we might print the "Waiting for unfinished jobs" message above
519 when not necessary. */
521 if (dead_children
> 0)
525 any_local
= shell_function_pid
!= 0;
526 for (c
= children
; c
!= 0; c
= c
->next
)
528 any_remote
|= c
->remote
;
529 any_local
|= ! c
->remote
;
530 DB (DB_JOBS
, (_("Live child %p (%s) PID %s %s\n"),
531 c
, c
->file
->name
, pid2str (c
->pid
),
532 c
->remote
? _(" (remote)") : ""));
538 /* First, check for remote children. */
540 pid
= remote_status (&exit_code
, &exit_sig
, &coredump
, 0);
545 /* We got a remote child. */
549 /* A remote status command failed miserably. Punt. */
551 pfatal_with_name ("remote_status");
555 /* No remote children. Check for local children. */
556 #if !defined(__MSDOS__) && !defined(_AMIGA) && !defined(WINDOWS32)
560 vmsWaitForChildren (&status
);
565 pid
= WAIT_NOHANG (&status
);
568 EINTRLOOP(pid
, wait (&status
));
576 /* The wait*() failed miserably. Punt. */
577 pfatal_with_name ("wait");
581 /* We got a child exit; chop the status word up. */
582 exit_code
= WEXITSTATUS (status
);
583 exit_sig
= WIFSIGNALED (status
) ? WTERMSIG (status
) : 0;
584 coredump
= WCOREDUMP (status
);
586 /* If we have started jobs in this second, remove one. */
592 /* No local children are dead. */
595 if (!block
|| !any_remote
)
598 /* Now try a blocking wait for a remote child. */
599 pid
= remote_status (&exit_code
, &exit_sig
, &coredump
, 1);
601 goto remote_status_lose
;
603 /* No remote children either. Finally give up. */
606 /* We got a remote child. */
609 #endif /* !__MSDOS__, !Amiga, !WINDOWS32. */
612 /* Life is very different on MSDOS. */
615 exit_code
= WEXITSTATUS (status
);
616 if (exit_code
== 0xff)
618 exit_sig
= WIFSIGNALED (status
) ? WTERMSIG (status
) : 0;
620 #endif /* __MSDOS__ */
624 status
= amiga_status
;
625 exit_code
= amiga_status
;
638 /* Record the thread ID of the main process, so that we
639 could suspend it in the signal handler. */
642 hcTID
= GetCurrentThread ();
643 hcPID
= GetCurrentProcess ();
644 if (!DuplicateHandle (hcPID
, hcTID
, hcPID
, &main_thread
, 0,
645 FALSE
, DUPLICATE_SAME_ACCESS
))
647 DWORD e
= GetLastError ();
649 "Determine main thread ID (Error %ld: %s)\n",
650 e
, map_windows32_error_to_string(e
));
653 DB (DB_VERBOSE
, ("Main thread handle = %p\n", main_thread
));
656 /* wait for anything to finish */
657 hPID
= process_wait_for_any();
661 /* was an error found on this process? */
662 werr
= process_last_err(hPID
);
665 exit_code
= process_exit_code(hPID
);
668 fprintf(stderr
, "make (e=%d): %s",
669 exit_code
, map_windows32_error_to_string(exit_code
));
672 exit_sig
= process_signal(hPID
);
674 /* cleanup process */
675 process_cleanup(hPID
);
681 #endif /* WINDOWS32 */
684 /* Check if this is the child of the `shell' function. */
685 if (!remote
&& pid
== shell_function_pid
)
687 /* It is. Leave an indicator for the `shell' function. */
688 if (exit_sig
== 0 && exit_code
== 127)
689 shell_function_completed
= -1;
691 shell_function_completed
= 1;
695 child_failed
= exit_sig
!= 0 || exit_code
!= 0;
697 /* Search for a child matching the deceased one. */
699 for (c
= children
; c
!= 0; lastc
= c
, c
= c
->next
)
700 if (c
->remote
== remote
&& c
->pid
== pid
)
704 /* An unknown child died.
705 Ignore it; it was inherited from our invoker. */
708 DB (DB_JOBS
, (child_failed
709 ? _("Reaping losing child %p PID %s %s\n")
710 : _("Reaping winning child %p PID %s %s\n"),
711 c
, pid2str (c
->pid
), c
->remote
? _(" (remote)") : ""));
713 if (c
->sh_batch_file
) {
714 DB (DB_JOBS
, (_("Cleaning up temp batch file %s\n"),
717 /* just try and remove, don't care if this fails */
718 remove (c
->sh_batch_file
);
720 /* all done with memory */
721 free (c
->sh_batch_file
);
722 c
->sh_batch_file
= NULL
;
725 /* If this child had the good stdin, say it is now free. */
729 dontcare
= c
->dontcare
;
731 if (child_failed
&& !c
->noerror
&& !ignore_errors_flag
)
733 /* The commands failed. Write an error message,
734 delete non-precious targets, and abort. */
735 static int delete_on_error
= -1;
738 child_error (c
->file
->name
, exit_code
, exit_sig
, coredump
, 0);
740 c
->file
->update_status
= 2;
741 if (delete_on_error
== -1)
743 struct file
*f
= lookup_file (".DELETE_ON_ERROR");
744 delete_on_error
= f
!= 0 && f
->is_target
;
746 if (exit_sig
!= 0 || delete_on_error
)
747 delete_child_targets (c
);
753 /* The commands failed, but we don't care. */
754 child_error (c
->file
->name
,
755 exit_code
, exit_sig
, coredump
, 1);
759 /* If there are more commands to run, try to start them. */
760 if (job_next_command (c
))
762 if (handling_fatal_signal
)
764 /* Never start new commands while we are dying.
765 Since there are more commands that wanted to be run,
766 the target was not completely remade. So we treat
767 this as if a command had failed. */
768 c
->file
->update_status
= 2;
772 /* Check again whether to start remotely.
773 Whether or not we want to changes over time.
774 Also, start_remote_job may need state set up
775 by start_remote_job_p. */
776 c
->remote
= start_remote_job_p (0);
777 start_job_command (c
);
778 /* Fatal signals are left blocked in case we were
779 about to put that child on the chain. But it is
780 already there, so it is safe for a fatal signal to
781 arrive now; it will clean up this child's targets. */
783 if (c
->file
->command_state
== cs_running
)
784 /* We successfully started the new command.
785 Loop to reap more children. */
789 if (c
->file
->update_status
!= 0)
790 /* We failed to start the commands. */
791 delete_child_targets (c
);
794 /* There are no more commands. We got through them all
795 without an unignored error. Now the target has been
796 successfully updated. */
797 c
->file
->update_status
= 0;
800 /* When we get here, all the commands for C->file are finished
801 (or aborted) and C->file->update_status contains 0 or 2. But
802 C->file->command_state is still cs_running if all the commands
803 ran; notice_finish_file looks for cs_running to tell it that
804 it's interesting to check the file's modtime again now. */
806 if (! handling_fatal_signal
)
807 /* Notice if the target of the commands has been changed.
808 This also propagates its values for command_state and
809 update_status to its also_make files. */
810 notice_finished_file (c
->file
);
812 DB (DB_JOBS
, (_("Removing child %p PID %s%s from chain.\n"),
813 c
, pid2str (c
->pid
), c
->remote
? _(" (remote)") : ""));
815 /* Block fatal signals while frobnicating the list, so that
816 children and job_slots_used are always consistent. Otherwise
817 a fatal signal arriving after the child is off the chain and
818 before job_slots_used is decremented would believe a child was
819 live and call reap_children again. */
822 /* There is now another slot open. */
823 if (job_slots_used
> 0)
826 /* Remove the child from the chain and free it. */
830 lastc
->next
= c
->next
;
836 /* If the job failed, and the -k flag was not given, die,
837 unless we are already in the process of dying. */
838 if (!err
&& child_failed
&& !dontcare
&& !keep_going_flag
&&
839 /* fatal_error_signal will die with the right signal. */
840 !handling_fatal_signal
)
843 /* Only block for one child. */
850 /* Free the storage allocated for CHILD. */
853 free_child (struct child
*child
)
855 if (!jobserver_tokens
)
856 fatal (NILF
, "INTERNAL: Freeing child %p (%s) but no tokens left!\n",
857 child
, child
->file
->name
);
859 /* If we're using the jobserver and this child is not the only outstanding
860 job, put a token back into the pipe for it. */
862 if (job_fds
[1] >= 0 && jobserver_tokens
> 1)
867 /* Write a job token back to the pipe. */
869 EINTRLOOP (r
, write (job_fds
[1], &token
, 1));
871 pfatal_with_name (_("write jobserver"));
873 DB (DB_JOBS
, (_("Released token for child %p (%s).\n"),
874 child
, child
->file
->name
));
879 if (handling_fatal_signal
) /* Don't bother free'ing if about to die. */
882 if (child
->command_lines
!= 0)
884 register unsigned int i
;
885 for (i
= 0; i
< child
->file
->cmds
->ncommand_lines
; ++i
)
886 free (child
->command_lines
[i
]);
887 free (child
->command_lines
);
890 if (child
->environment
!= 0)
892 register char **ep
= child
->environment
;
895 free (child
->environment
);
902 extern sigset_t fatal_signal_set
;
909 (void) sigprocmask (SIG_BLOCK
, &fatal_signal_set
, (sigset_t
*) 0);
911 # ifdef HAVE_SIGSETMASK
912 (void) sigblock (fatal_signal_mask
);
922 sigemptyset (&empty
);
923 sigprocmask (SIG_SETMASK
, &empty
, (sigset_t
*) 0);
927 #ifdef MAKE_JOBSERVER
929 job_noop (int sig UNUSED
)
932 /* Set the child handler action flags to FLAGS. */
934 set_child_handler_action_flags (int set_handler
, int set_alarm
)
939 /* The child handler must be turned off here. */
940 signal (SIGCHLD
, SIG_DFL
);
943 memset (&sa
, '\0', sizeof sa
);
944 sa
.sa_handler
= child_handler
;
945 sa
.sa_flags
= set_handler
? 0 : SA_RESTART
;
947 sigaction (SIGCHLD
, &sa
, NULL
);
949 #if defined SIGCLD && SIGCLD != SIGCHLD
950 sigaction (SIGCLD
, &sa
, NULL
);
955 /* If we're about to enter the read(), set an alarm to wake up in a
956 second so we can check if the load has dropped and we can start more
957 work. On the way out, turn off the alarm and set SIG_DFL. */
958 alarm (set_handler
? 1 : 0);
959 sa
.sa_handler
= set_handler
? job_noop
: SIG_DFL
;
961 sigaction (SIGALRM
, &sa
, NULL
);
968 /* Start a job to run the commands specified in CHILD.
969 CHILD is updated to reflect the commands and ID of the child process.
971 NOTE: On return fatal signals are blocked! The caller is responsible
972 for calling `unblock_sigs', once the new child is safely on the chain so
973 it can be cleaned up in the event of a fatal signal. */
976 start_job_command (struct child
*child
)
978 #if !defined(_AMIGA) && !defined(WINDOWS32)
979 static int bad_stdin
= -1;
982 /* Must be volatile to silence bogus GCC warning about longjmp/vfork. */
990 /* If we have a completely empty commandset, stop now. */
991 if (!child
->command_ptr
)
994 /* Combine the flags parsed for the line itself with
995 the flags specified globally for this target. */
996 flags
= (child
->file
->command_flags
997 | child
->file
->cmds
->lines_flags
[child
->command_line
- 1]);
999 p
= child
->command_ptr
;
1000 child
->noerror
= ((flags
& COMMANDS_NOERROR
) != 0);
1005 flags
|= COMMANDS_SILENT
;
1007 flags
|= COMMANDS_RECURSE
;
1010 else if (!isblank ((unsigned char)*p
))
1015 /* Update the file's command flags with any new ones we found. We only
1016 keep the COMMANDS_RECURSE setting. Even this isn't 100% correct; we are
1017 now marking more commands recursive than should be in the case of
1018 multiline define/endef scripts where only one line is marked "+". In
1019 order to really fix this, we'll have to keep a lines_flags for every
1020 actual line, after expansion. */
1021 child
->file
->cmds
->lines_flags
[child
->command_line
- 1]
1022 |= flags
& COMMANDS_RECURSE
;
1024 /* Figure out an argument list from this command line. */
1031 argv
= construct_command_argv (p
, &end
, child
->file
,
1032 child
->file
->cmds
->lines_flags
[child
->command_line
- 1],
1033 &child
->sh_batch_file
);
1036 child
->command_ptr
= NULL
;
1040 child
->command_ptr
= end
;
1044 /* If -q was given, say that updating `failed' if there was any text on the
1045 command line, or `succeeded' otherwise. The exit status of 1 tells the
1046 user that -q is saying `something to do'; the exit status for a random
1048 if (argv
!= 0 && question_flag
&& !(flags
& COMMANDS_RECURSE
))
1054 child
->file
->update_status
= 1;
1055 notice_finished_file (child
->file
);
1059 if (touch_flag
&& !(flags
& COMMANDS_RECURSE
))
1061 /* Go on to the next command. It might be the recursive one.
1062 We construct ARGV only to find the end of the command line. */
1077 execute_by_shell
= 0; /* in case construct_command_argv sets it */
1079 /* This line has no commands. Go to the next. */
1080 if (job_next_command (child
))
1081 start_job_command (child
);
1084 /* No more commands. Make sure we're "running"; we might not be if
1085 (e.g.) all commands were skipped due to -n. */
1086 set_command_state (child
->file
, cs_running
);
1087 child
->file
->update_status
= 0;
1088 notice_finished_file (child
->file
);
1093 /* Print out the command. If silent, we call `message' with null so it
1094 can log the working directory before the command's own error messages
1097 message (0, (just_print_flag
|| (!(flags
& COMMANDS_SILENT
) && !silent_flag
))
1098 ? "%s" : (char *) 0, p
);
1100 /* Tell update_goal_chain that a command has been started on behalf of
1101 this target. It is important that this happens here and not in
1102 reap_children (where we used to do it), because reap_children might be
1103 reaping children from a different target. We want this increment to
1104 guaranteedly indicate that a command was started for the dependency
1105 chain (i.e., update_file recursion chain) we are processing. */
1109 /* Optimize an empty command. People use this for timestamp rules,
1110 so avoid forking a useless shell. Do this after we increment
1111 commands_started so make still treats this special case as if it
1112 performed some action (makes a difference as to what messages are
1115 #if !defined(VMS) && !defined(_AMIGA)
1117 #if defined __MSDOS__ || defined (__EMX__)
1118 unixy_shell
/* the test is complicated and we already did it */
1120 (argv
[0] && !strcmp (argv
[0], "/bin/sh"))
1123 && argv
[1][0] == '-' && argv
[1][1] == 'c' && argv
[1][2] == '\0')
1124 && (argv
[2] && argv
[2][0] == ':' && argv
[2][1] == '\0')
1131 #endif /* !VMS && !_AMIGA */
1133 /* If -n was given, recurse to get the next line in the sequence. */
1135 if (just_print_flag
&& !(flags
& COMMANDS_RECURSE
))
1144 /* Flush the output streams so they won't have things written twice. */
1150 #if !defined(WINDOWS32) && !defined(_AMIGA) && !defined(__MSDOS__)
1152 /* Set up a bad standard input that reads from a broken pipe. */
1154 if (bad_stdin
== -1)
1156 /* Make a file descriptor that is the read end of a broken pipe.
1157 This will be used for some children's standard inputs. */
1161 /* Close the write side. */
1162 (void) close (pd
[1]);
1163 /* Save the read side. */
1166 /* Set the descriptor to close on exec, so it does not litter any
1167 child's descriptor table. When it is dup2'd onto descriptor 0,
1168 that descriptor will not close on exec. */
1169 CLOSE_ON_EXEC (bad_stdin
);
1173 #endif /* !WINDOWS32 && !_AMIGA && !__MSDOS__ */
1175 /* Decide whether to give this child the `good' standard input
1176 (one that points to the terminal or whatever), or the `bad' one
1177 that points to the read side of a broken pipe. */
1179 child
->good_stdin
= !good_stdin_used
;
1180 if (child
->good_stdin
)
1181 good_stdin_used
= 1;
1188 /* Set up the environment for the child. */
1189 if (child
->environment
== 0)
1190 child
->environment
= target_environment (child
->file
);
1193 #if !defined(__MSDOS__) && !defined(_AMIGA) && !defined(WINDOWS32)
1196 /* start_waiting_job has set CHILD->remote if we can start a remote job. */
1199 int is_remote
, id
, used_stdin
;
1200 if (start_remote_job (argv
, child
->environment
,
1201 child
->good_stdin
? 0 : bad_stdin
,
1202 &is_remote
, &id
, &used_stdin
))
1203 /* Don't give up; remote execution may fail for various reasons. If
1204 so, simply run the job locally. */
1208 if (child
->good_stdin
&& !used_stdin
)
1210 child
->good_stdin
= 0;
1211 good_stdin_used
= 0;
1213 child
->remote
= is_remote
;
1220 /* Fork the child process. */
1222 char **parent_environ
;
1230 if (!child_execute_job (argv
, child
)) {
1232 perror_with_name ("vfork", "");
1238 parent_environ
= environ
;
1241 /* If we aren't running a recursive command and we have a jobserver
1242 pipe, close it before exec'ing. */
1243 if (!(flags
& COMMANDS_RECURSE
) && job_fds
[0] >= 0)
1245 CLOSE_ON_EXEC (job_fds
[0]);
1246 CLOSE_ON_EXEC (job_fds
[1]);
1249 CLOSE_ON_EXEC (job_rfd
);
1251 /* Never use fork()/exec() here! Use spawn() instead in exec_command() */
1252 child
->pid
= child_execute_job (child
->good_stdin
? 0 : bad_stdin
, 1,
1253 argv
, child
->environment
);
1258 perror_with_name ("spawn", "");
1262 /* undo CLOSE_ON_EXEC() after the child process has been started */
1263 if (!(flags
& COMMANDS_RECURSE
) && job_fds
[0] >= 0)
1265 fcntl (job_fds
[0], F_SETFD
, 0);
1266 fcntl (job_fds
[1], F_SETFD
, 0);
1269 fcntl (job_rfd
, F_SETFD
, 0);
1271 #else /* !__EMX__ */
1273 child
->pid
= vfork ();
1274 environ
= parent_environ
; /* Restore value child may have clobbered. */
1275 if (child
->pid
== 0)
1277 /* We are the child side. */
1280 /* If we aren't running a recursive command and we have a jobserver
1281 pipe, close it before exec'ing. */
1282 if (!(flags
& COMMANDS_RECURSE
) && job_fds
[0] >= 0)
1290 #ifdef SET_STACK_SIZE
1291 /* Reset limits, if necessary. */
1292 if (stack_limit
.rlim_cur
)
1293 setrlimit (RLIMIT_STACK
, &stack_limit
);
1296 child_execute_job (child
->good_stdin
? 0 : bad_stdin
, 1,
1297 argv
, child
->environment
);
1299 else if (child
->pid
< 0)
1303 perror_with_name ("vfork", "");
1306 # endif /* !__EMX__ */
1310 #else /* __MSDOS__ or Amiga or WINDOWS32 */
1318 /* We call `system' to do the job of the SHELL, since stock DOS
1319 shell is too dumb. Our `system' knows how to handle long
1320 command lines even if pipes/redirection is needed; it will only
1321 call COMMAND.COM when its internal commands are used. */
1322 if (execute_by_shell
)
1324 char *cmdline
= argv
[0];
1325 /* We don't have a way to pass environment to `system',
1326 so we need to save and restore ours, sigh... */
1327 char **parent_environ
= environ
;
1329 environ
= child
->environment
;
1331 /* If we have a *real* shell, tell `system' to call
1332 it to do everything for us. */
1335 /* A *real* shell on MSDOS may not support long
1336 command lines the DJGPP way, so we must use `system'. */
1337 cmdline
= argv
[2]; /* get past "shell -c" */
1340 dos_command_running
= 1;
1341 proc_return
= system (cmdline
);
1342 environ
= parent_environ
;
1343 execute_by_shell
= 0; /* for the next time */
1347 dos_command_running
= 1;
1348 proc_return
= spawnvpe (P_WAIT
, argv
[0], argv
, child
->environment
);
1351 /* Need to unblock signals before turning off
1352 dos_command_running, so that child's signals
1353 will be treated as such (see fatal_error_signal). */
1355 dos_command_running
= 0;
1357 /* If the child got a signal, dos_status has its
1358 high 8 bits set, so be careful not to alter them. */
1359 if (proc_return
== -1)
1362 dos_status
|= (proc_return
& 0xff);
1364 child
->pid
= dos_pid
++;
1366 #endif /* __MSDOS__ */
1368 amiga_status
= MyExecute (argv
);
1371 child
->pid
= amiga_pid
++;
1372 if (amiga_batch_file
)
1374 amiga_batch_file
= 0;
1375 DeleteFile (amiga_bname
); /* Ignore errors. */
1383 /* make UNC paths safe for CreateProcess -- backslash format */
1385 if (arg0
&& arg0
[0] == '/' && arg0
[1] == '/')
1386 for ( ; arg0
&& *arg0
; arg0
++)
1390 /* make sure CreateProcess() has Path it needs */
1391 sync_Path_environment();
1393 hPID
= process_easy(argv
, child
->environment
);
1395 if (hPID
!= INVALID_HANDLE_VALUE
)
1396 child
->pid
= (int) hPID
;
1401 _("process_easy() failed to launch process (e=%ld)\n"),
1402 process_last_err(hPID
));
1403 for (i
= 0; argv
[i
]; i
++)
1404 fprintf(stderr
, "%s ", argv
[i
]);
1405 fprintf(stderr
, _("\nCounted %d args in failed launch\n"), i
);
1409 #endif /* WINDOWS32 */
1410 #endif /* __MSDOS__ or Amiga or WINDOWS32 */
1412 /* Bump the number of jobs started in this second. */
1415 /* We are the parent side. Set the state to
1416 say the commands are running and return. */
1418 set_command_state (child
->file
, cs_running
);
1420 /* Free the storage used by the child's argument list. */
1429 child
->file
->update_status
= 2;
1430 notice_finished_file (child
->file
);
1434 /* Try to start a child running.
1435 Returns nonzero if the child was started (and maybe finished), or zero if
1436 the load was too high and the child was put on the `waiting_jobs' chain. */
1439 start_waiting_job (struct child
*c
)
1441 struct file
*f
= c
->file
;
1443 /* If we can start a job remotely, we always want to, and don't care about
1444 the local load average. We record that the job should be started
1445 remotely in C->remote for start_job_command to test. */
1447 c
->remote
= start_remote_job_p (1);
1449 /* If we are running at least one job already and the load average
1450 is too high, make this one wait. */
1452 && ((job_slots_used
> 0 && load_too_high ())
1454 || (process_used_slots () >= MAXIMUM_WAIT_OBJECTS
)
1458 /* Put this child on the chain of children waiting for the load average
1460 set_command_state (f
, cs_running
);
1461 c
->next
= waiting_jobs
;
1466 /* Start the first command; reap_children will run later command lines. */
1467 start_job_command (c
);
1469 switch (f
->command_state
)
1473 DB (DB_JOBS
, (_("Putting child %p (%s) PID %s%s on the chain.\n"),
1474 c
, c
->file
->name
, pid2str (c
->pid
),
1475 c
->remote
? _(" (remote)") : ""));
1477 /* One more job slot is in use. */
1482 case cs_not_started
:
1483 /* All the command lines turned out to be empty. */
1484 f
->update_status
= 0;
1488 notice_finished_file (f
);
1493 assert (f
->command_state
== cs_finished
);
1500 /* Create a `struct child' for FILE and start its commands running. */
1503 new_job (struct file
*file
)
1505 struct commands
*cmds
= file
->cmds
;
1510 /* Let any previously decided-upon jobs that are waiting
1511 for the load to go down start before this new one. */
1512 start_waiting_jobs ();
1514 /* Reap any children that might have finished recently. */
1515 reap_children (0, 0);
1517 /* Chop the commands up into lines if they aren't already. */
1518 chop_commands (cmds
);
1520 /* Expand the command lines and store the results in LINES. */
1521 lines
= xmalloc (cmds
->ncommand_lines
* sizeof (char *));
1522 for (i
= 0; i
< cmds
->ncommand_lines
; ++i
)
1524 /* Collapse backslash-newline combinations that are inside variable
1525 or function references. These are left alone by the parser so
1526 that they will appear in the echoing of commands (where they look
1527 nice); and collapsed by construct_command_argv when it tokenizes.
1528 But letting them survive inside function invocations loses because
1529 we don't want the functions to see them as part of the text. */
1531 char *in
, *out
, *ref
;
1533 /* IN points to where in the line we are scanning.
1534 OUT points to where in the line we are writing.
1535 When we collapse a backslash-newline combination,
1536 IN gets ahead of OUT. */
1538 in
= out
= cmds
->command_lines
[i
];
1539 while ((ref
= strchr (in
, '$')) != 0)
1541 ++ref
; /* Move past the $. */
1544 /* Copy the text between the end of the last chunk
1545 we processed (where IN points) and the new chunk
1546 we are about to process (where REF points). */
1547 memmove (out
, in
, ref
- in
);
1549 /* Move both pointers past the boring stuff. */
1553 if (*ref
== '(' || *ref
== '{')
1555 char openparen
= *ref
;
1556 char closeparen
= openparen
== '(' ? ')' : '}';
1560 *out
++ = *in
++; /* Copy OPENPAREN. */
1561 /* IN now points past the opening paren or brace.
1562 Count parens or braces until it is matched. */
1566 if (*in
== closeparen
&& --count
< 0)
1568 else if (*in
== '\\' && in
[1] == '\n')
1570 /* We have found a backslash-newline inside a
1571 variable or function reference. Eat it and
1572 any following whitespace. */
1575 for (p
= in
- 1; p
> ref
&& *p
== '\\'; --p
)
1579 /* There were two or more backslashes, so this is
1580 not really a continuation line. We don't collapse
1581 the quoting backslashes here as is done in
1582 collapse_continuations, because the line will
1583 be collapsed again after expansion. */
1587 /* Skip the backslash, newline and
1588 any following whitespace. */
1589 in
= next_token (in
+ 2);
1591 /* Discard any preceding whitespace that has
1592 already been written to the output. */
1594 && isblank ((unsigned char)out
[-1]))
1597 /* Replace it all with a single space. */
1603 if (*in
== openparen
)
1612 /* There are no more references in this line to worry about.
1613 Copy the remaining uninteresting text to the output. */
1615 memmove (out
, in
, strlen (in
) + 1);
1617 /* Finally, expand the line. */
1618 lines
[i
] = allocated_variable_expand_for_file (cmds
->command_lines
[i
],
1622 /* Start the command sequence, record it in a new
1623 `struct child', and add that to the chain. */
1625 c
= xcalloc (sizeof (struct child
));
1627 c
->command_lines
= lines
;
1628 c
->sh_batch_file
= NULL
;
1630 /* Cache dontcare flag because file->dontcare can be changed once we
1631 return. Check dontcare inheritance mechanism for details. */
1632 c
->dontcare
= file
->dontcare
;
1634 /* Fetch the first command line to be run. */
1635 job_next_command (c
);
1637 /* Wait for a job slot to be freed up. If we allow an infinite number
1638 don't bother; also job_slots will == 0 if we're using the jobserver. */
1641 while (job_slots_used
== job_slots
)
1642 reap_children (1, 0);
1644 #ifdef MAKE_JOBSERVER
1645 /* If we are controlling multiple jobs make sure we have a token before
1646 starting the child. */
1648 /* This can be inefficient. There's a decent chance that this job won't
1649 actually have to run any subprocesses: the command script may be empty
1650 or otherwise optimized away. It would be nice if we could defer
1651 obtaining a token until just before we need it, in start_job_command.
1652 To do that we'd need to keep track of whether we'd already obtained a
1653 token (since start_job_command is called for each line of the job, not
1654 just once). Also more thought needs to go into the entire algorithm;
1655 this is where the old parallel job code waits, so... */
1657 else if (job_fds
[0] >= 0)
1664 DB (DB_JOBS
, ("Need a job token; we %shave children\n",
1665 children
? "" : "don't "));
1667 /* If we don't already have a job started, use our "free" token. */
1668 if (!jobserver_tokens
)
1671 /* Read a token. As long as there's no token available we'll block.
1672 We enable interruptible system calls before the read(2) so that if
1673 we get a SIGCHLD while we're waiting, we'll return with EINTR and
1674 we can process the death(s) and return tokens to the free pool.
1676 Once we return from the read, we immediately reinstate restartable
1677 system calls. This allows us to not worry about checking for
1678 EINTR on all the other system calls in the program.
1680 There is one other twist: there is a span between the time
1681 reap_children() does its last check for dead children and the time
1682 the read(2) call is entered, below, where if a child dies we won't
1683 notice. This is extremely serious as it could cause us to
1684 deadlock, given the right set of events.
1686 To avoid this, we do the following: before we reap_children(), we
1687 dup(2) the read FD on the jobserver pipe. The read(2) call below
1688 uses that new FD. In the signal handler, we close that FD. That
1689 way, if a child dies during the section mentioned above, the
1690 read(2) will be invoked with an invalid FD and will return
1691 immediately with EBADF. */
1693 /* Make sure we have a dup'd FD. */
1696 DB (DB_JOBS
, ("Duplicate the job FD\n"));
1697 job_rfd
= dup (job_fds
[0]);
1700 /* Reap anything that's currently waiting. */
1701 reap_children (0, 0);
1703 /* Kick off any jobs we have waiting for an opportunity that
1704 can run now (ie waiting for load). */
1705 start_waiting_jobs ();
1707 /* If our "free" slot has become available, use it; we don't need an
1709 if (!jobserver_tokens
)
1712 /* There must be at least one child already, or we have no business
1713 waiting for a token. */
1715 fatal (NILF
, "INTERNAL: no children as we go to sleep on read\n");
1717 /* Set interruptible system calls, and read() for a job token. */
1718 set_child_handler_action_flags (1, waiting_jobs
!= NULL
);
1719 got_token
= read (job_rfd
, &token
, 1);
1720 saved_errno
= errno
;
1721 set_child_handler_action_flags (0, waiting_jobs
!= NULL
);
1723 /* If we got one, we're done here. */
1726 DB (DB_JOBS
, (_("Obtained token for child %p (%s).\n"),
1731 /* If the error _wasn't_ expected (EINTR or EBADF), punt. Otherwise,
1732 go back and reap_children(), and try again. */
1733 errno
= saved_errno
;
1734 if (errno
!= EINTR
&& errno
!= EBADF
)
1735 pfatal_with_name (_("read jobs pipe"));
1737 DB (DB_JOBS
, ("Read returned EBADF.\n"));
1743 /* The job is now primed. Start it running.
1744 (This will notice if there is in fact no recipe.) */
1745 if (cmds
->fileinfo
.filenm
)
1746 DB (DB_BASIC
, (_("Invoking recipe from %s:%lu to update target `%s'.\n"),
1747 cmds
->fileinfo
.filenm
, cmds
->fileinfo
.lineno
,
1750 DB (DB_BASIC
, (_("Invoking builtin recipe to update target `%s'.\n"),
1754 start_waiting_job (c
);
1756 if (job_slots
== 1 || not_parallel
)
1757 /* Since there is only one job slot, make things run linearly.
1758 Wait for the child to die, setting the state to `cs_finished'. */
1759 while (file
->command_state
== cs_running
)
1760 reap_children (1, 0);
1765 /* Move CHILD's pointers to the next command for it to execute.
1766 Returns nonzero if there is another command. */
1769 job_next_command (struct child
*child
)
1771 while (child
->command_ptr
== 0 || *child
->command_ptr
== '\0')
1773 /* There are no more lines in the expansion of this line. */
1774 if (child
->command_line
== child
->file
->cmds
->ncommand_lines
)
1776 /* There are no more lines to be expanded. */
1777 child
->command_ptr
= 0;
1781 /* Get the next line to run. */
1782 child
->command_ptr
= child
->command_lines
[child
->command_line
++];
1787 /* Determine if the load average on the system is too high to start a new job.
1788 The real system load average is only recomputed once a second. However, a
1789 very parallel make can easily start tens or even hundreds of jobs in a
1790 second, which brings the system to its knees for a while until that first
1791 batch of jobs clears out.
1793 To avoid this we use a weighted algorithm to try to account for jobs which
1794 have been started since the last second, and guess what the load average
1795 would be now if it were computed.
1797 This algorithm was provided by Thomas Riedl <thomas.riedl@siemens.com>,
1800 ! calculate something load-oid and add to the observed sys.load,
1801 ! so that latter can catch up:
1802 ! - every job started increases jobctr;
1803 ! - every dying job decreases a positive jobctr;
1804 ! - the jobctr value gets zeroed every change of seconds,
1805 ! after its value*weight_b is stored into the 'backlog' value last_sec
1806 ! - weight_a times the sum of jobctr and last_sec gets
1807 ! added to the observed sys.load.
1809 ! The two weights have been tried out on 24 and 48 proc. Sun Solaris-9
1810 ! machines, using a several-thousand-jobs-mix of cpp, cc, cxx and smallish
1811 ! sub-shelled commands (rm, echo, sed...) for tests.
1812 ! lowering the 'direct influence' factor weight_a (e.g. to 0.1)
1813 ! resulted in significant excession of the load limit, raising it
1814 ! (e.g. to 0.5) took bad to small, fast-executing jobs and didn't
1815 ! reach the limit in most test cases.
1817 ! lowering the 'history influence' weight_b (e.g. to 0.1) resulted in
1818 ! exceeding the limit for longer-running stuff (compile jobs in
1819 ! the .5 to 1.5 sec. range),raising it (e.g. to 0.5) overrepresented
1820 ! small jobs' effects.
1824 #define LOAD_WEIGHT_A 0.25
1825 #define LOAD_WEIGHT_B 0.25
1828 load_too_high (void)
1830 #if defined(__MSDOS__) || defined(VMS) || defined(_AMIGA) || defined(__riscos__)
1833 static double last_sec
;
1834 static time_t last_now
;
1839 /* sub_proc.c cannot wait for more than MAXIMUM_WAIT_OBJECTS children */
1840 if (process_used_slots () >= MAXIMUM_WAIT_OBJECTS
)
1844 if (max_load_average
< 0)
1847 /* Find the real system load average. */
1849 if (getloadavg (&load
, 1) != 1)
1851 static int lossage
= -1;
1852 /* Complain only once for the same error. */
1853 if (lossage
== -1 || errno
!= lossage
)
1856 /* An errno value of zero means getloadavg is just unsupported. */
1858 _("cannot enforce load limits on this operating system"));
1860 perror_with_name (_("cannot enforce load limit: "), "getloadavg");
1867 /* If we're in a new second zero the counter and correct the backlog
1868 value. Only keep the backlog for one extra second; after that it's 0. */
1872 if (last_now
== now
- 1)
1873 last_sec
= LOAD_WEIGHT_B
* job_counter
;
1881 /* Try to guess what the load would be right now. */
1882 guess
= load
+ (LOAD_WEIGHT_A
* (job_counter
+ last_sec
));
1884 DB (DB_JOBS
, ("Estimated system load = %f (actual = %f) (max requested = %f)\n",
1885 guess
, load
, max_load_average
));
1887 return guess
>= max_load_average
;
1891 /* Start jobs that are waiting for the load to be lower. */
1894 start_waiting_jobs (void)
1898 if (waiting_jobs
== 0)
1903 /* Check for recently deceased descendants. */
1904 reap_children (0, 0);
1906 /* Take a job off the waiting list. */
1908 waiting_jobs
= job
->next
;
1910 /* Try to start that job. We break out of the loop as soon
1911 as start_waiting_job puts one back on the waiting list. */
1913 while (start_waiting_job (job
) && waiting_jobs
!= 0);
1920 /* EMX: Start a child process. This function returns the new pid. */
1921 # if defined __EMX__
1923 child_execute_job (int stdin_fd
, int stdout_fd
, char **argv
, char **envp
)
1926 /* stdin_fd == 0 means: nothing to do for stdin;
1927 stdout_fd == 1 means: nothing to do for stdout */
1928 int save_stdin
= (stdin_fd
!= 0) ? dup (0) : 0;
1929 int save_stdout
= (stdout_fd
!= 1) ? dup (1): 1;
1931 /* < 0 only if dup() failed */
1933 fatal (NILF
, _("no more file handles: could not duplicate stdin\n"));
1934 if (save_stdout
< 0)
1935 fatal (NILF
, _("no more file handles: could not duplicate stdout\n"));
1937 /* Close unnecessary file handles for the child. */
1938 if (save_stdin
!= 0)
1939 CLOSE_ON_EXEC (save_stdin
);
1940 if (save_stdout
!= 1)
1941 CLOSE_ON_EXEC (save_stdout
);
1943 /* Connect the pipes to the child process. */
1945 (void) dup2 (stdin_fd
, 0);
1947 (void) dup2 (stdout_fd
, 1);
1949 /* stdin_fd and stdout_fd must be closed on exit because we are
1950 still in the parent process */
1952 CLOSE_ON_EXEC (stdin_fd
);
1954 CLOSE_ON_EXEC (stdout_fd
);
1956 /* Run the command. */
1957 pid
= exec_command (argv
, envp
);
1959 /* Restore stdout/stdin of the parent and close temporary FDs. */
1962 if (dup2 (save_stdin
, 0) != 0)
1963 fatal (NILF
, _("Could not restore stdin\n"));
1970 if (dup2 (save_stdout
, 1) != 1)
1971 fatal (NILF
, _("Could not restore stdout\n"));
1973 close (save_stdout
);
1979 #elif !defined (_AMIGA) && !defined (__MSDOS__) && !defined (VMS)
1982 Replace the current process with one executing the command in ARGV.
1983 STDIN_FD and STDOUT_FD are used as the process's stdin and stdout; ENVP is
1984 the environment of the new program. This function does not return. */
1986 child_execute_job (int stdin_fd
, int stdout_fd
, char **argv
, char **envp
)
1989 (void) dup2 (stdin_fd
, 0);
1991 (void) dup2 (stdout_fd
, 1);
1993 (void) close (stdin_fd
);
1995 (void) close (stdout_fd
);
1997 /* Run the command. */
1998 exec_command (argv
, envp
);
2000 #endif /* !AMIGA && !__MSDOS__ && !VMS */
2001 #endif /* !WINDOWS32 */
2004 /* Replace the current process with one running the command in ARGV,
2005 with environment ENVP. This function does not return. */
2007 /* EMX: This function returns the pid of the child process. */
2013 exec_command (char **argv
, char **envp
)
2016 /* to work around a problem with signals and execve: ignore them */
2018 signal (SIGCHLD
,SIG_IGN
);
2020 /* Run the program. */
2021 execve (argv
[0], argv
, envp
);
2022 perror_with_name ("execve: ", argv
[0]);
2023 _exit (EXIT_FAILURE
);
2029 int exit_code
= EXIT_FAILURE
;
2031 /* make sure CreateProcess() has Path it needs */
2032 sync_Path_environment();
2034 /* launch command */
2035 hPID
= process_easy(argv
, envp
);
2037 /* make sure launch ok */
2038 if (hPID
== INVALID_HANDLE_VALUE
)
2042 _("process_easy() failed to launch process (e=%ld)\n"),
2043 process_last_err(hPID
));
2044 for (i
= 0; argv
[i
]; i
++)
2045 fprintf(stderr
, "%s ", argv
[i
]);
2046 fprintf(stderr
, _("\nCounted %d args in failed launch\n"), i
);
2050 /* wait and reap last child */
2051 hWaitPID
= process_wait_for_any();
2054 /* was an error found on this process? */
2055 err
= process_last_err(hWaitPID
);
2058 exit_code
= process_exit_code(hWaitPID
);
2061 fprintf(stderr
, "make (e=%d, rc=%d): %s",
2062 err
, exit_code
, map_windows32_error_to_string(err
));
2064 /* cleanup process */
2065 process_cleanup(hWaitPID
);
2067 /* expect to find only last pid, warn about other pids reaped */
2068 if (hWaitPID
== hPID
)
2072 _("make reaped child pid %Iu, still waiting for pid %Iu\n"),
2073 (DWORD_PTR
)hWaitPID
, (DWORD_PTR
)hPID
);
2076 /* return child's exit code as our exit code */
2079 #else /* !WINDOWS32 */
2085 /* Be the user, permanently. */
2090 /* Run the program. */
2091 pid
= spawnvpe (P_NOWAIT
, argv
[0], argv
, envp
);
2096 /* the file might have a strange shell extension */
2097 if (errno
== ENOENT
)
2102 /* Run the program. */
2104 execvp (argv
[0], argv
);
2106 # endif /* !__EMX__ */
2111 error (NILF
, _("%s: Command not found"), argv
[0]);
2115 /* The file is not executable. Try it as a shell script. */
2116 extern char *getenv ();
2123 /* Do not use $SHELL from the environment */
2124 struct variable
*p
= lookup_variable ("SHELL", 5);
2130 shell
= getenv ("SHELL");
2133 shell
= default_shell
;
2136 while (argv
[argc
] != 0)
2144 new_argv
= alloca ((1 + argc
+ 1) * sizeof (char *));
2145 new_argv
[0] = shell
;
2156 new_argv
[i
] = argv
[0];
2159 new_argv
[i
+ argc
] = argv
[argc
];
2164 pid
= spawnvpe (P_NOWAIT
, shell
, new_argv
, envp
);
2168 execvp (shell
, new_argv
);
2170 if (errno
== ENOENT
)
2171 error (NILF
, _("%s: Shell program not found"), shell
);
2173 perror_with_name ("execvp: ", shell
);
2179 /* this nasty error was driving me nuts :-( */
2180 error (NILF
, _("spawnvpe: environment space might be exhausted"));
2185 perror_with_name ("execvp: ", argv
[0]);
2194 #endif /* !WINDOWS32 */
2197 #else /* On Amiga */
2198 void exec_command (char **argv
)
2203 void clean_tmp (void)
2205 DeleteFile (amiga_bname
);
2208 #endif /* On Amiga */
2211 /* Figure out the argument list necessary to run LINE as a command. Try to
2212 avoid using a shell. This routine handles only ' quoting, and " quoting
2213 when no backslash, $ or ` characters are seen in the quotes. Starting
2214 quotes may be escaped with a backslash. If any of the characters in
2215 sh_chars[] is seen, or any of the builtin commands listed in sh_cmds[]
2216 is the first word of a line, the shell is used.
2218 If RESTP is not NULL, *RESTP is set to point to the first newline in LINE.
2219 If *RESTP is NULL, newlines will be ignored.
2221 SHELL is the shell to use, or nil to use the default shell.
2222 IFS is the value of $IFS, or nil (meaning the default).
2224 FLAGS is the value of lines_flags for this command line. It is
2225 used in the WINDOWS32 port to check whether + or $(MAKE) were found
2226 in this command line, in which case the effect of just_print_flag
2230 construct_command_argv_internal (char *line
, char **restp
, char *shell
,
2231 char *shellflags
, char *ifs
, int flags
,
2232 char **batch_filename_ptr
)
2235 /* MSDOS supports both the stock DOS shell and ports of Unixy shells.
2236 We call `system' for anything that requires ``slow'' processing,
2237 because DOS shells are too dumb. When $SHELL points to a real
2238 (unix-style) shell, `system' just calls it to do everything. When
2239 $SHELL points to a DOS shell, `system' does most of the work
2240 internally, calling the shell only for its internal commands.
2241 However, it looks on the $PATH first, so you can e.g. have an
2242 external command named `mkdir'.
2244 Since we call `system', certain characters and commands below are
2245 actually not specific to COMMAND.COM, but to the DJGPP implementation
2246 of `system'. In particular:
2248 The shell wildcard characters are in DOS_CHARS because they will
2249 not be expanded if we call the child via `spawnXX'.
2251 The `;' is in DOS_CHARS, because our `system' knows how to run
2252 multiple commands on a single line.
2254 DOS_CHARS also include characters special to 4DOS/NDOS, so we
2255 won't have to tell one from another and have one more set of
2256 commands and special characters. */
2257 static char sh_chars_dos
[] = "*?[];|<>%^&()";
2258 static char *sh_cmds_dos
[] = { "break", "call", "cd", "chcp", "chdir", "cls",
2259 "copy", "ctty", "date", "del", "dir", "echo",
2260 "erase", "exit", "for", "goto", "if", "md",
2261 "mkdir", "path", "pause", "prompt", "rd",
2262 "rmdir", "rem", "ren", "rename", "set",
2263 "shift", "time", "type", "ver", "verify",
2266 static char sh_chars_sh
[] = "#;\"*?[]&|<>(){}$`^";
2267 static char *sh_cmds_sh
[] = { "cd", "echo", "eval", "exec", "exit", "login",
2268 "logout", "set", "umask", "wait", "while",
2269 "for", "case", "if", ":", ".", "break",
2270 "continue", "export", "read", "readonly",
2271 "shift", "times", "trap", "switch", "unset",
2276 #elif defined (__EMX__)
2277 static char sh_chars_dos
[] = "*?[];|<>%^&()";
2278 static char *sh_cmds_dos
[] = { "break", "call", "cd", "chcp", "chdir", "cls",
2279 "copy", "ctty", "date", "del", "dir", "echo",
2280 "erase", "exit", "for", "goto", "if", "md",
2281 "mkdir", "path", "pause", "prompt", "rd",
2282 "rmdir", "rem", "ren", "rename", "set",
2283 "shift", "time", "type", "ver", "verify",
2286 static char sh_chars_os2
[] = "*?[];|<>%^()\"'&";
2287 static char *sh_cmds_os2
[] = { "call", "cd", "chcp", "chdir", "cls", "copy",
2288 "date", "del", "detach", "dir", "echo",
2289 "endlocal", "erase", "exit", "for", "goto", "if",
2290 "keys", "md", "mkdir", "move", "path", "pause",
2291 "prompt", "rd", "rem", "ren", "rename", "rmdir",
2292 "set", "setlocal", "shift", "start", "time",
2293 "type", "ver", "verify", "vol", ":", 0 };
2295 static char sh_chars_sh
[] = "#;\"*?[]&|<>(){}$`^~'";
2296 static char *sh_cmds_sh
[] = { "echo", "cd", "eval", "exec", "exit", "login",
2297 "logout", "set", "umask", "wait", "while",
2298 "for", "case", "if", ":", ".", "break",
2299 "continue", "export", "read", "readonly",
2300 "shift", "times", "trap", "switch", "unset",
2305 #elif defined (_AMIGA)
2306 static char sh_chars
[] = "#;\"|<>()?*$`";
2307 static char *sh_cmds
[] = { "cd", "eval", "if", "delete", "echo", "copy",
2308 "rename", "set", "setenv", "date", "makedir",
2309 "skip", "else", "endif", "path", "prompt",
2310 "unset", "unsetenv", "version",
2312 #elif defined (WINDOWS32)
2313 static char sh_chars_dos
[] = "\"|&<>";
2314 static char *sh_cmds_dos
[] = { "assoc", "break", "call", "cd", "chcp",
2315 "chdir", "cls", "color", "copy", "ctty",
2316 "date", "del", "dir", "echo", "echo.",
2317 "endlocal", "erase", "exit", "for", "ftype",
2318 "goto", "if", "if", "md", "mkdir", "path",
2319 "pause", "prompt", "rd", "rem", "ren",
2320 "rename", "rmdir", "set", "setlocal",
2321 "shift", "time", "title", "type", "ver",
2322 "verify", "vol", ":", 0 };
2323 static char sh_chars_sh
[] = "#;\"*?[]&|<>(){}$`^";
2324 static char *sh_cmds_sh
[] = { "cd", "eval", "exec", "exit", "login",
2325 "logout", "set", "umask", "wait", "while", "for",
2326 "case", "if", ":", ".", "break", "continue",
2327 "export", "read", "readonly", "shift", "times",
2328 "trap", "switch", "test",
2329 #ifdef BATCH_MODE_ONLY_SHELL
2335 #elif defined(__riscos__)
2336 static char sh_chars
[] = "";
2337 static char *sh_cmds
[] = { 0 };
2338 #else /* must be UNIX-ish */
2339 static char sh_chars
[] = "#;\"*?[]&|<>(){}$`^~!";
2340 static char *sh_cmds
[] = { ".", ":", "break", "case", "cd", "continue",
2341 "eval", "exec", "exit", "export", "for", "if",
2342 "login", "logout", "read", "readonly", "set",
2343 "shift", "switch", "test", "times", "trap",
2344 "ulimit", "umask", "unset", "wait", "while", 0 };
2345 # ifdef HAVE_DOS_PATHS
2346 /* This is required if the MSYS/Cygwin ports (which do not define
2347 WINDOWS32) are compiled with HAVE_DOS_PATHS defined, which uses
2348 sh_chars_sh[] directly (see below). */
2349 static char *sh_chars_sh
= sh_chars
;
2350 # endif /* HAVE_DOS_PATHS */
2356 int instring
, word_has_equals
, seen_nonequals
, last_argument_was_empty
;
2357 char **new_argv
= 0;
2363 sh_cmds
= sh_cmds_dos
;
2364 sh_chars
= sh_chars_dos
;
2366 sh_cmds
= sh_cmds_sh
;
2367 sh_chars
= sh_chars_sh
;
2369 #endif /* WINDOWS32 */
2374 /* Make sure not to bother processing an empty line. */
2375 while (isblank ((unsigned char)*line
))
2380 /* See if it is safe to parse commands internally. */
2382 shell
= default_shell
;
2384 else if (strcmp (shell
, default_shell
))
2386 char *s1
= _fullpath (NULL
, shell
, 0);
2387 char *s2
= _fullpath (NULL
, default_shell
, 0);
2389 slow_flag
= strcmp ((s1
? s1
: ""), (s2
? s2
: ""));
2398 #else /* not WINDOWS32 */
2399 #if defined (__MSDOS__) || defined (__EMX__)
2400 else if (strcasecmp (shell
, default_shell
))
2402 extern int _is_unixy_shell (const char *_path
);
2404 DB (DB_BASIC
, (_("$SHELL changed (was `%s', now `%s')\n"),
2405 default_shell
, shell
));
2406 unixy_shell
= _is_unixy_shell (shell
);
2407 /* we must allocate a copy of shell: construct_command_argv() will free
2408 * shell after this function returns. */
2409 default_shell
= xstrdup (shell
);
2413 sh_chars
= sh_chars_sh
;
2414 sh_cmds
= sh_cmds_sh
;
2418 sh_chars
= sh_chars_dos
;
2419 sh_cmds
= sh_cmds_dos
;
2421 if (_osmode
== OS2_MODE
)
2423 sh_chars
= sh_chars_os2
;
2424 sh_cmds
= sh_cmds_os2
;
2428 #else /* !__MSDOS__ */
2429 else if (strcmp (shell
, default_shell
))
2431 #endif /* !__MSDOS__ && !__EMX__ */
2432 #endif /* not WINDOWS32 */
2435 for (ap
= ifs
; *ap
!= '\0'; ++ap
)
2436 if (*ap
!= ' ' && *ap
!= '\t' && *ap
!= '\n')
2439 if (shellflags
!= 0)
2440 if (shellflags
[0] != '-'
2441 || ((shellflags
[1] != 'c' || shellflags
[2] != '\0')
2442 && (shellflags
[1] != 'e' || shellflags
[2] != 'c' || shellflags
[3] != '\0')))
2445 i
= strlen (line
) + 1;
2447 /* More than 1 arg per character is impossible. */
2448 new_argv
= xmalloc (i
* sizeof (char *));
2450 /* All the args can fit in a buffer as big as LINE is. */
2451 ap
= new_argv
[0] = argstr
= xmalloc (i
);
2454 /* I is how many complete arguments have been found. */
2456 instring
= word_has_equals
= seen_nonequals
= last_argument_was_empty
= 0;
2457 for (p
= line
; *p
!= '\0'; ++p
)
2463 /* Inside a string, just copy any char except a closing quote
2464 or a backslash-newline combination. */
2468 if (ap
== new_argv
[0] || *(ap
-1) == '\0')
2469 last_argument_was_empty
= 1;
2471 else if (*p
== '\\' && p
[1] == '\n')
2473 /* Backslash-newline is handled differently depending on what
2474 kind of string we're in: inside single-quoted strings you
2475 keep them; in double-quoted strings they disappear.
2476 For DOS/Windows/OS2, if we don't have a POSIX shell,
2477 we keep the pre-POSIX behavior of removing the
2478 backslash-newline. */
2480 #if defined (__MSDOS__) || defined (__EMX__) || defined (WINDOWS32)
2491 else if (*p
== '\n' && restp
!= NULL
)
2493 /* End of the command line. */
2497 /* Backslash, $, and ` are special inside double quotes.
2498 If we see any of those, punt.
2499 But on MSDOS, if we use COMMAND.COM, double and single
2500 quotes have the same effect. */
2501 else if (instring
== '"' && strchr ("\\$`", *p
) != 0 && unixy_shell
)
2506 else if (strchr (sh_chars
, *p
) != 0)
2507 /* Not inside a string, but it's a special char. */
2510 else if (*p
== '.' && p
[1] == '.' && p
[2] == '.' && p
[3] != '.')
2511 /* `...' is a wildcard in DJGPP. */
2515 /* Not a special char. */
2519 /* Equals is a special character in leading words before the
2520 first word with no equals sign in it. This is not the case
2521 with sh -k, but we never get here when using nonstandard
2523 if (! seen_nonequals
&& unixy_shell
)
2525 word_has_equals
= 1;
2530 /* Backslash-newline has special case handling, ref POSIX.
2531 We're in the fastpath, so emulate what the shell would do. */
2534 /* Throw out the backslash and newline. */
2537 /* If there's nothing in this argument yet, skip any
2538 whitespace before the start of the next word. */
2539 if (ap
== new_argv
[i
])
2540 p
= next_token (p
+ 1) - 1;
2542 else if (p
[1] != '\0')
2544 #ifdef HAVE_DOS_PATHS
2545 /* Only remove backslashes before characters special to Unixy
2546 shells. All other backslashes are copied verbatim, since
2547 they are probably DOS-style directory separators. This
2548 still leaves a small window for problems, but at least it
2549 should work for the vast majority of naive users. */
2552 /* A dot is only special as part of the "..."
2554 if (strneq (p
+ 1, ".\\.\\.", 5))
2562 if (p
[1] != '\\' && p
[1] != '\''
2563 && !isspace ((unsigned char)p
[1])
2564 && strchr (sh_chars_sh
, p
[1]) == 0)
2565 /* back up one notch, to copy the backslash */
2567 #endif /* HAVE_DOS_PATHS */
2569 /* Copy and skip the following char. */
2582 /* End of the command line. */
2587 /* Newlines are not special. */
2593 /* We have the end of an argument.
2594 Terminate the text of the argument. */
2597 last_argument_was_empty
= 0;
2599 /* Update SEEN_NONEQUALS, which tells us if every word
2600 heretofore has contained an `='. */
2601 seen_nonequals
|= ! word_has_equals
;
2602 if (word_has_equals
&& ! seen_nonequals
)
2603 /* An `=' in a word before the first
2604 word without one is magical. */
2606 word_has_equals
= 0; /* Prepare for the next word. */
2608 /* If this argument is the command name,
2609 see if it is a built-in shell command.
2610 If so, have the shell handle it. */
2614 for (j
= 0; sh_cmds
[j
] != 0; ++j
)
2616 if (streq (sh_cmds
[j
], new_argv
[0]))
2619 /* Non-Unix shells are case insensitive. */
2621 && strcasecmp (sh_cmds
[j
], new_argv
[0]) == 0)
2627 /* Ignore multiple whitespace chars. */
2628 p
= next_token (p
) - 1;
2639 /* Let the shell deal with an unterminated quote. */
2642 /* Terminate the last argument and the argument list. */
2645 if (new_argv
[i
][0] != '\0' || last_argument_was_empty
)
2652 for (j
= 0; sh_cmds
[j
] != 0; ++j
)
2653 if (streq (sh_cmds
[j
], new_argv
[0]))
2657 if (new_argv
[0] == 0)
2659 /* Line was empty. */
2668 /* We must use the shell. */
2672 /* Free the old argument list we were working on. */
2678 execute_by_shell
= 1; /* actually, call `system' if shell isn't unixy */
2687 buffer
= xmalloc (strlen (line
)+1);
2690 for (dptr
=buffer
; *ptr
; )
2692 if (*ptr
== '\\' && ptr
[1] == '\n')
2694 else if (*ptr
== '@') /* Kludge: multiline commands */
2704 new_argv
= xmalloc (2 * sizeof (char *));
2705 new_argv
[0] = buffer
;
2708 #else /* Not Amiga */
2711 * Not eating this whitespace caused things like
2715 * which gave the shell fits. I think we have to eat
2716 * whitespace here, but this code should be considered
2717 * suspicious if things start failing....
2720 /* Make sure not to bother processing an empty line. */
2721 while (isspace ((unsigned char)*line
))
2725 #endif /* WINDOWS32 */
2728 /* SHELL may be a multi-word command. Construct a command line
2729 "$(SHELL) $(.SHELLFLAGS) LINE", with all special chars in LINE escaped.
2730 Then recurse, expanding this command line to get the final
2733 unsigned int shell_len
= strlen (shell
);
2734 unsigned int line_len
= strlen (line
);
2735 unsigned int sflags_len
= strlen (shellflags
);
2737 char *new_line
= alloca (shell_len
+ 1 + sflags_len
+ 1
2738 + (line_len
*2) + 1);
2739 char *command_ptr
= NULL
; /* used for batch_mode_shell mode */
2741 # ifdef __EMX__ /* is this necessary? */
2743 shellflags
[0] = '/'; /* "/c" */
2747 memcpy (ap
, shell
, shell_len
);
2750 memcpy (ap
, shellflags
, sflags_len
);
2754 for (p
= line
; *p
!= '\0'; ++p
)
2756 if (restp
!= NULL
&& *p
== '\n')
2761 else if (*p
== '\\' && p
[1] == '\n')
2763 /* POSIX says we keep the backslash-newline. If we don't have a
2764 POSIX shell on DOS/Windows/OS2, mimic the pre-POSIX behavior
2765 and remove the backslash/newline. */
2766 #if defined (__MSDOS__) || defined (__EMX__) || defined (WINDOWS32)
2767 # define PRESERVE_BSNL unixy_shell
2769 # define PRESERVE_BSNL 1
2774 /* Only non-batch execution needs another backslash,
2775 because it will be passed through a recursive
2776 invocation of this function. */
2777 if (!batch_mode_shell
)
2785 /* DOS shells don't know about backslash-escaping. */
2786 if (unixy_shell
&& !batch_mode_shell
&&
2787 (*p
== '\\' || *p
== '\'' || *p
== '"'
2788 || isspace ((unsigned char)*p
)
2789 || strchr (sh_chars
, *p
) != 0))
2792 else if (unixy_shell
&& strneq (p
, "...", 3))
2794 /* The case of `...' wildcard again. */
2795 strcpy (ap
, "\\.\\.\\");
2802 if (ap
== new_line
+ shell_len
+ sflags_len
+ 2)
2803 /* Line was empty. */
2808 /* Some shells do not work well when invoked as 'sh -c xxx' to run a
2809 command line (e.g. Cygnus GNUWIN32 sh.exe on WIN32 systems). In these
2810 cases, run commands via a script file. */
2811 if (just_print_flag
&& !(flags
& COMMANDS_RECURSE
)) {
2812 /* Need to allocate new_argv, although it's unused, because
2813 start_job_command will want to free it and its 0'th element. */
2814 new_argv
= xmalloc(2 * sizeof (char *));
2815 new_argv
[0] = xstrdup ("");
2817 } else if ((no_default_sh_exe
|| batch_mode_shell
) && batch_filename_ptr
) {
2820 int id
= GetCurrentProcessId();
2823 /* create a file name */
2824 sprintf(fbuf
, "make%d", id
);
2825 *batch_filename_ptr
= create_batch_file (fbuf
, unixy_shell
, &temp_fd
);
2827 DB (DB_JOBS
, (_("Creating temporary batch file %s\n"),
2828 *batch_filename_ptr
));
2830 /* Create a FILE object for the batch file, and write to it the
2831 commands to be executed. Put the batch file in TEXT mode. */
2832 _setmode (temp_fd
, _O_TEXT
);
2833 batch
= _fdopen (temp_fd
, "wt");
2835 fputs ("@echo off\n", batch
);
2836 fputs (command_ptr
, batch
);
2837 fputc ('\n', batch
);
2839 DB (DB_JOBS
, (_("Batch file contents:%s\n\t%s\n"),
2840 !unixy_shell
? "\n\t@echo off" : "", command_ptr
));
2843 new_argv
= xmalloc(3 * sizeof (char *));
2845 new_argv
[0] = xstrdup (shell
);
2846 new_argv
[1] = *batch_filename_ptr
; /* only argv[0] gets freed later */
2848 new_argv
[0] = xstrdup (*batch_filename_ptr
);
2853 #endif /* WINDOWS32 */
2856 new_argv
= construct_command_argv_internal (new_line
, 0, 0, 0, 0, flags
, 0);
2859 else if (!unixy_shell
)
2861 /* new_line is local, must not be freed therefore
2862 We use line here instead of new_line because we run the shell
2864 size_t line_len
= strlen (line
);
2867 memcpy (new_line
, line
, line_len
+ 1);
2868 /* Replace all backslash-newline combination and also following tabs.
2869 Important: stop at the first '\n' because that's what the loop above
2870 did. The next line starting at restp[0] will be executed during the
2871 next call of this function. */
2872 while (*q
!= '\0' && *q
!= '\n')
2874 if (q
[0] == '\\' && q
[1] == '\n')
2875 q
+= 2; /* remove '\\' and '\n' */
2881 # ifndef NO_CMD_DEFAULT
2882 if (strnicmp (new_line
, "echo", 4) == 0
2883 && (new_line
[4] == ' ' || new_line
[4] == '\t'))
2885 /* the builtin echo command: handle it separately */
2886 size_t echo_len
= line_len
- 5;
2887 char *echo_line
= new_line
+ 5;
2889 /* special case: echo 'x="y"'
2890 cmd works this way: a string is printed as is, i.e., no quotes
2891 are removed. But autoconf uses a command like echo 'x="y"' to
2892 determine whether make works. autoconf expects the output x="y"
2893 so we will do exactly that.
2894 Note: if we do not allow cmd to be the default shell
2895 we do not need this kind of voodoo */
2896 if (echo_line
[0] == '\''
2897 && echo_line
[echo_len
- 1] == '\''
2898 && strncmp (echo_line
+ 1, "ac_maketemp=",
2899 strlen ("ac_maketemp=")) == 0)
2901 /* remove the enclosing quotes */
2902 memmove (echo_line
, echo_line
+ 1, echo_len
- 2);
2903 echo_line
[echo_len
- 2] = '\0';
2909 /* Let the shell decide what to do. Put the command line into the
2910 2nd command line argument and hope for the best ;-) */
2911 size_t sh_len
= strlen (shell
);
2913 /* exactly 3 arguments + NULL */
2914 new_argv
= xmalloc (4 * sizeof (char *));
2915 /* Exactly strlen(shell) + strlen("/c") + strlen(line) + 3 times
2916 the trailing '\0' */
2917 new_argv
[0] = xmalloc (sh_len
+ line_len
+ 5);
2918 memcpy (new_argv
[0], shell
, sh_len
+ 1);
2919 new_argv
[1] = new_argv
[0] + sh_len
+ 1;
2920 memcpy (new_argv
[1], "/c", 3);
2921 new_argv
[2] = new_argv
[1] + 3;
2922 memcpy (new_argv
[2], new_line
, line_len
+ 1);
2926 #elif defined(__MSDOS__)
2929 /* With MSDOS shells, we must construct the command line here
2930 instead of recursively calling ourselves, because we
2931 cannot backslash-escape the special characters (see above). */
2932 new_argv
= xmalloc (sizeof (char *));
2933 line_len
= strlen (new_line
) - shell_len
- sflags_len
- 2;
2934 new_argv
[0] = xmalloc (line_len
+ 1);
2935 strncpy (new_argv
[0],
2936 new_line
+ shell_len
+ sflags_len
+ 2, line_len
);
2937 new_argv
[0][line_len
] = '\0';
2941 fatal (NILF
, _("%s (line %d) Bad shell context (!unixy && !batch_mode_shell)\n"),
2942 __FILE__
, __LINE__
);
2945 #endif /* ! AMIGA */
2951 /* Figure out the argument list necessary to run LINE as a command. Try to
2952 avoid using a shell. This routine handles only ' quoting, and " quoting
2953 when no backslash, $ or ` characters are seen in the quotes. Starting
2954 quotes may be escaped with a backslash. If any of the characters in
2955 sh_chars[] is seen, or any of the builtin commands listed in sh_cmds[]
2956 is the first word of a line, the shell is used.
2958 If RESTP is not NULL, *RESTP is set to point to the first newline in LINE.
2959 If *RESTP is NULL, newlines will be ignored.
2961 FILE is the target whose commands these are. It is used for
2962 variable expansion for $(SHELL) and $(IFS). */
2965 construct_command_argv (char *line
, char **restp
, struct file
*file
,
2966 int cmd_flags
, char **batch_filename_ptr
)
2968 char *shell
, *ifs
, *shellflags
;
2980 && (isspace ((unsigned char)*cptr
)))
2985 && (!isspace((unsigned char)*cptr
)))
2990 argv
= xmalloc (argc
* sizeof (char *));
2999 && (isspace ((unsigned char)*cptr
)))
3003 DB (DB_JOBS
, ("argv[%d] = [%s]\n", argc
, cptr
));
3004 argv
[argc
++] = cptr
;
3006 && (!isspace((unsigned char)*cptr
)))
3013 /* Turn off --warn-undefined-variables while we expand SHELL and IFS. */
3014 int save
= warn_undefined_variables_flag
;
3015 warn_undefined_variables_flag
= 0;
3017 shell
= allocated_variable_expand_for_file ("$(SHELL)", file
);
3020 * Convert to forward slashes so that construct_command_argv_internal()
3024 char *p
= w32ify (shell
, 0);
3030 static const char *unixroot
= NULL
;
3031 static const char *last_shell
= "";
3032 static int init
= 0;
3035 unixroot
= getenv ("UNIXROOT");
3036 /* unixroot must be NULL or not empty */
3037 if (unixroot
&& unixroot
[0] == '\0') unixroot
= NULL
;
3041 /* if we have an unixroot drive and if shell is not default_shell
3042 (which means it's either cmd.exe or the test has already been
3043 performed) and if shell is an absolute path without drive letter,
3044 try whether it exists e.g.: if "/bin/sh" does not exist use
3045 "$UNIXROOT/bin/sh" instead. */
3046 if (unixroot
&& shell
&& strcmp (shell
, last_shell
) != 0
3047 && (shell
[0] == '/' || shell
[0] == '\\'))
3049 /* trying a new shell, check whether it exists */
3050 size_t size
= strlen (shell
);
3051 char *buf
= xmalloc (size
+ 7);
3052 memcpy (buf
, shell
, size
);
3053 memcpy (buf
+ size
, ".exe", 5); /* including the trailing '\0' */
3054 if (access (shell
, F_OK
) != 0 && access (buf
, F_OK
) != 0)
3056 /* try the same for the unixroot drive */
3057 memmove (buf
+ 2, buf
, size
+ 5);
3058 buf
[0] = unixroot
[0];
3059 buf
[1] = unixroot
[1];
3060 if (access (buf
, F_OK
) == 0)
3061 /* we have found a shell! */
3071 #endif /* __EMX__ */
3073 shellflags
= allocated_variable_expand_for_file ("$(.SHELLFLAGS)", file
);
3074 ifs
= allocated_variable_expand_for_file ("$(IFS)", file
);
3076 warn_undefined_variables_flag
= save
;
3079 argv
= construct_command_argv_internal (line
, restp
, shell
, shellflags
, ifs
,
3080 cmd_flags
, batch_filename_ptr
);
3089 #if !defined(HAVE_DUP2) && !defined(_AMIGA)
3091 dup2 (int old
, int new)
3106 #endif /* !HAPE_DUP2 && !_AMIGA */
3108 /* On VMS systems, include special VMS functions. */
3111 #include "vmsjobs.c"