1 /* Job execution and handling for GNU Make.
2 Copyright (C) 1988, 89, 90, 91, 92, 93, 94 Free Software Foundation, Inc.
3 This file is part of GNU Make.
5 GNU Make is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 GNU Make is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNU Make; see the file COPYING. If not, write to
17 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
26 /* Default path to search for executables. */
27 static char default_path
[] = ":/bin:/usr/bin";
29 /* Default shell to use. */
30 char default_shell
[] = "/bin/sh";
34 static int dos_pid
= 123;
35 static int dos_status
;
36 static char *dos_bname
;
37 static char *dos_bename
;
38 static int dos_batch_file
;
42 /* If NGROUPS_MAX == 0 then try other methods for finding a real value. */
43 #if defined (NGROUPS_MAX) && NGROUPS_MAX == 0
45 #endif /* NGROUPS_MAX == 0 */
49 #define GET_NGROUPS_MAX sysconf (_SC_NGROUPS_MAX)
50 #else /* Not POSIX. */
51 #define NGROUPS_MAX NGROUPS
55 #ifdef HAVE_SYS_WAIT_H
60 #define WAIT_NOHANG(status) waitpid (-1, (status), WNOHANG)
61 #else /* Don't have waitpid. */
66 #define WAIT_NOHANG(status) wait3 ((status), WNOHANG, (struct rusage *) 0)
67 #endif /* Have wait3. */
68 #endif /* Have waitpid. */
70 #if !defined (wait) && !defined (POSIX)
74 #ifndef HAVE_UNION_WAIT
79 #define WTERMSIG(x) ((x) & 0x7f)
82 #define WCOREDUMP(x) ((x) & 0x80)
85 #define WEXITSTATUS(x) (((x) >> 8) & 0xff)
88 #define WIFSIGNALED(x) (WTERMSIG (x) != 0)
91 #define WIFEXITED(x) (WTERMSIG (x) == 0)
94 #else /* Have `union wait'. */
96 #define WAIT_T union wait
98 #define WTERMSIG(x) ((x).w_termsig)
101 #define WCOREDUMP(x) ((x).w_coredump)
104 #define WEXITSTATUS(x) ((x).w_retcode)
107 #define WIFSIGNALED(x) (WTERMSIG(x) != 0)
110 #define WIFEXITED(x) (WTERMSIG(x) == 0)
113 #endif /* Don't have `union wait'. */
116 #ifndef HAVE_UNISTD_H
118 extern int execve ();
119 extern void _exit ();
120 extern int geteuid (), getegid ();
121 extern int setgid (), getgid ();
124 #ifndef getdtablesize
125 #ifdef HAVE_GETDTABLESIZE
126 extern int getdtablesize ();
128 #include <sys/param.h>
129 #define getdtablesize() NOFILE
130 #if !defined (NOFILE) && defined (NOFILES_MAX)
131 /* SCO 3.2 "devsys 4.2" defines NOFILES_{MIN,MAX} in lieu of NOFILE. */
132 #define NOFILE NOFILES_MAX
137 extern int getloadavg ();
138 extern int start_remote_job_p ();
139 extern int start_remote_job (), remote_status ();
141 RETSIGTYPE
child_handler ();
142 static void free_child (), start_job_command ();
143 static int load_too_high (), job_next_command ();
145 /* Chain of all live (or recently deceased) children. */
147 struct child
*children
= 0;
149 /* Number of children currently running. */
151 unsigned int job_slots_used
= 0;
153 /* Nonzero if the `good' standard input is in use. */
155 static int good_stdin_used
= 0;
157 /* Chain of children waiting to run until the load average goes down. */
159 static struct child
*waiting_jobs
= 0;
161 /* Write an error message describing the exit status given in
162 EXIT_CODE, EXIT_SIG, and COREDUMP, for the target TARGET_NAME.
163 Append "(ignored)" if IGNORED is nonzero. */
166 child_error (target_name
, exit_code
, exit_sig
, coredump
, ignored
)
168 int exit_code
, exit_sig
, coredump
;
172 error (ignored
? "[%s] Error %d (ignored)" :
174 target_name
, exit_code
);
177 char *coredump_string
= coredump
? " (core dumped)" : "";
178 if (exit_sig
> 0 && exit_sig
< NSIG
)
179 error ("*** [%s] %s%s",
180 target_name
, sys_siglist
[exit_sig
], coredump_string
);
182 error ("*** [%s] Signal %d%s", target_name
, exit_sig
, coredump_string
);
186 static unsigned int dead_children
= 0;
188 /* Notice that a child died.
189 reap_children should be called when convenient. */
197 printf ("Got a SIGCHLD; %d unreaped children.\n", dead_children
);
200 extern int shell_function_pid
, shell_function_completed
;
202 /* Reap dead children, storing the returned status and the new command
203 state (`cs_finished') in the `file' member of the `struct child' for the
204 dead child, and removing the child from the chain. If BLOCK nonzero,
205 reap at least one child, waiting for it to die if necessary. If ERR is
206 nonzero, print an error message first. */
209 reap_children (block
, err
)
214 while ((children
!= 0 || shell_function_pid
!= 0) &&
215 (block
|| dead_children
> 0))
219 int exit_code
, exit_sig
, coredump
;
220 register struct child
*lastc
, *c
;
222 int any_remote
, any_local
;
224 if (err
&& dead_children
== 0)
226 /* We might block for a while, so let the user know why. */
228 error ("*** Waiting for unfinished jobs....");
231 /* We have one less dead child to reap.
232 The test and decrement are not atomic; if it is compiled into:
233 register = dead_children - 1;
234 dead_children = register;
235 a SIGCHLD could come between the two instructions.
236 child_handler increments dead_children.
237 The second instruction here would lose that increment. But the
238 only effect of dead_children being wrong is that we might wait
239 longer than necessary to reap a child, and lose some parallelism;
240 and we might print the "Waiting for unfinished jobs" message above
241 when not necessary. */
243 if (dead_children
!= 0)
247 any_local
= shell_function_pid
!= -1;
248 for (c
= children
; c
!= 0; c
= c
->next
)
250 any_remote
|= c
->remote
;
251 any_local
|= ! c
->remote
;
253 printf ("Live child 0x%08lx PID %d%s\n",
254 (unsigned long int) c
,
255 c
->pid
, c
->remote
? " (remote)" : "");
258 /* First, check for remote children. */
260 pid
= remote_status (&exit_code
, &exit_sig
, &coredump
, 0);
270 pfatal_with_name ("remote_status");
275 /* No remote children. Check for local children. */
281 pid
= WAIT_NOHANG (&status
);
284 pid
= wait (&status
);
295 pfatal_with_name ("wait");
299 /* No local children. */
300 if (block
&& any_remote
)
302 /* Now try a blocking wait for a remote child. */
303 pid
= remote_status (&exit_code
, &exit_sig
, &coredump
, 1);
305 goto remote_status_lose
;
307 /* No remote children either. Finally give up. */
310 /* We got a remote child. */
318 /* Chop the status word up. */
319 exit_code
= WEXITSTATUS (status
);
320 exit_sig
= WIFSIGNALED (status
) ? WTERMSIG (status
) : 0;
321 coredump
= WCOREDUMP (status
);
324 /* Life is very different on MSDOS. */
327 exit_code
= dos_status
;
330 #endif /* Not MSDOS. */
333 /* We got a remote child. */
336 /* Check if this is the child of the `shell' function. */
337 if (!remote
&& pid
== shell_function_pid
)
339 /* It is. Leave an indicator for the `shell' function. */
340 if (exit_sig
== 0 && exit_code
== 127)
341 shell_function_completed
= -1;
343 shell_function_completed
= 1;
347 child_failed
= exit_sig
!= 0 || exit_code
!= 0;
349 /* Search for a child matching the deceased one. */
351 for (c
= children
; c
!= 0; lastc
= c
, c
= c
->next
)
352 if (c
->remote
== remote
&& c
->pid
== pid
)
357 /* An unknown child died. */
359 sprintf (buf
, "Unknown%s job %d", remote
? " remote" : "", pid
);
361 child_error (buf
, exit_code
, exit_sig
, coredump
,
364 error ("%s finished.", buf
);
369 printf ("Reaping %s child 0x%08lx PID %d%s\n",
370 child_failed
? "losing" : "winning",
371 (unsigned long int) c
,
372 c
->pid
, c
->remote
? " (remote)" : "");
374 /* If this child had the good stdin, say it is now free. */
378 if (child_failed
&& !c
->noerror
&& !ignore_errors_flag
)
380 /* The commands failed. Write an error message,
381 delete non-precious targets, and abort. */
382 child_error (c
->file
->name
, exit_code
, exit_sig
, coredump
, 0);
383 c
->file
->update_status
= 1;
385 delete_child_targets (c
);
391 /* The commands failed, but we don't care. */
392 child_error (c
->file
->name
,
393 exit_code
, exit_sig
, coredump
, 1);
397 /* If there are more commands to run, try to start them. */
398 if (job_next_command (c
))
400 if (handling_fatal_signal
)
402 /* Never start new commands while we are dying.
403 Since there are more commands that wanted to be run,
404 the target was not completely remade. So we treat
405 this as if a command had failed. */
406 c
->file
->update_status
= 1;
410 /* Check again whether to start remotely.
411 Whether or not we want to changes over time.
412 Also, start_remote_job may need state set up
413 by start_remote_job_p. */
414 c
->remote
= start_remote_job_p ();
415 start_job_command (c
);
416 if (c
->file
->command_state
== cs_running
)
417 /* We successfully started the new command.
418 Loop to reap more children. */
422 if (c
->file
->update_status
!= 0)
423 /* We failed to start the commands. */
424 delete_child_targets (c
);
427 /* There are no more commands. We got through them all
428 without an unignored error. Now the target has been
429 successfully updated. */
430 c
->file
->update_status
= 0;
433 /* When we get here, all the commands for C->file are finished
434 (or aborted) and C->file->update_status contains 0 or 1. But
435 C->file->command_state is still cs_running if all the commands
436 ran; notice_finish_file looks for cs_running to tell it that
437 it's interesting to check the file's modtime again now. */
439 if (! handling_fatal_signal
)
440 /* Notice if the target of the commands has been changed.
441 This also propagates its values for command_state and
442 update_status to its also_make files. */
443 notice_finished_file (c
->file
);
446 printf ("Removing child 0x%08lx PID %d%s from chain.\n",
447 (unsigned long int) c
,
448 c
->pid
, c
->remote
? " (remote)" : "");
450 /* Remove the child from the chain and free it. */
454 lastc
->next
= c
->next
;
455 if (! handling_fatal_signal
) /* Avoid nonreentrancy. */
458 /* There is now another slot open. */
461 /* If the job failed, and the -k flag was not given, die,
462 unless we are already in the process of dying. */
463 if (!err
&& child_failed
&& !keep_going_flag
)
467 /* Only block for one child. */
472 /* Free the storage allocated for CHILD. */
476 register struct child
*child
;
478 if (child
->command_lines
!= 0)
480 register unsigned int i
;
481 for (i
= 0; i
< child
->file
->cmds
->ncommand_lines
; ++i
)
482 free (child
->command_lines
[i
]);
483 free ((char *) child
->command_lines
);
486 if (child
->environment
!= 0)
488 register char **ep
= child
->environment
;
491 free ((char *) child
->environment
);
494 free ((char *) child
);
505 extern sigset_t fatal_signal_set
;
511 sigemptyset (&empty
);
512 sigprocmask (SIG_SETMASK
, &empty
, (sigset_t
*) 0);
517 /* Start a job to run the commands specified in CHILD.
518 CHILD is updated to reflect the commands and ID of the child process. */
521 start_job_command (child
)
522 register struct child
*child
;
524 static int bad_stdin
= -1;
526 int flags
= child
->file
->cmds
->lines_flags
[child
->command_line
- 1];
529 p
= child
->command_ptr
;
530 child
->noerror
= flags
& COMMANDS_NOERROR
;
534 flags
|= COMMANDS_SILENT
;
536 flags
|= COMMANDS_RECURSE
;
539 else if (!isblank (*p
) && *p
!= '+')
544 /* If -q was given, just say that updating `failed'. The exit status of
545 1 tells the user that -q is saying `something to do'; the exit status
546 for a random error is 2. */
547 if (question_flag
&& !(flags
& COMMANDS_RECURSE
))
549 child
->file
->update_status
= 1;
550 notice_finished_file (child
->file
);
554 /* There may be some preceding whitespace left if there
555 was nothing but a backslash on the first line. */
558 /* Figure out an argument list from this command line. */
562 argv
= construct_command_argv (p
, &end
, child
->file
);
564 child
->command_ptr
= NULL
;
568 child
->command_ptr
= end
;
572 if (touch_flag
&& !(flags
& COMMANDS_RECURSE
))
574 /* Go on to the next command. It might be the recursive one.
575 We construct ARGV only to find the end of the command line. */
577 free ((char *) argv
);
583 /* This line has no commands. Go to the next. */
584 if (job_next_command (child
))
585 start_job_command (child
);
586 child
->file
->update_status
= 0;
590 /* Print out the command. */
592 if (just_print_flag
|| (!(flags
& COMMANDS_SILENT
) && !silent_flag
))
595 /* Tell update_goal_chain that a command has been started on behalf of
596 this target. It is important that this happens here and not in
597 reap_children (where we used to do it), because reap_children might be
598 reaping children from a different target. We want this increment to
599 guaranteedly indicate that a command was started for the dependency
600 chain (i.e., update_file recursion chain) we are processing. */
604 /* If -n was given, recurse to get the next line in the sequence. */
606 if (just_print_flag
&& !(flags
& COMMANDS_RECURSE
))
609 free ((char *) argv
);
610 if (job_next_command (child
))
611 start_job_command (child
);
612 child
->file
->update_status
= 0;
616 /* Flush the output streams so they won't have things written twice. */
621 /* Set up a bad standard input that reads from a broken pipe. */
625 /* Make a file descriptor that is the read end of a broken pipe.
626 This will be used for some children's standard inputs. */
630 /* Close the write side. */
631 (void) close (pd
[1]);
632 /* Save the read side. */
637 /* Decide whether to give this child the `good' standard input
638 (one that points to the terminal or whatever), or the `bad' one
639 that points to the read side of a broken pipe. */
641 child
->good_stdin
= !good_stdin_used
;
642 if (child
->good_stdin
)
647 /* Set up the environment for the child. */
648 if (child
->environment
== 0)
649 child
->environment
= target_environment (child
->file
);
653 /* start_waiting_job has set CHILD->remote if we can start a remote job. */
656 int is_remote
, id
, used_stdin
;
657 if (start_remote_job (argv
, child
->environment
,
658 child
->good_stdin
? 0 : bad_stdin
,
659 &is_remote
, &id
, &used_stdin
))
663 if (child
->good_stdin
&& !used_stdin
)
665 child
->good_stdin
= 0;
668 child
->remote
= is_remote
;
674 /* Fork the child process. */
677 (void) sigprocmask (SIG_BLOCK
, &fatal_signal_set
, (sigset_t
*) 0);
679 #ifdef HAVE_SIGSETMASK
680 (void) sigblock (fatal_signal_mask
);
685 child
->pid
= vfork ();
688 /* We are the child side. */
690 child_execute_job (child
->good_stdin
? 0 : bad_stdin
, 1,
691 argv
, child
->environment
);
693 else if (child
->pid
< 0)
697 perror_with_name ("vfork", "");
703 dos_status
= spawnvpe (P_WAIT
, argv
[0], argv
, child
->environment
);
705 child
->pid
= dos_pid
++;
709 remove (dos_bname
); /* Ignore errors. */
710 if (access (dos_bename
, 0))
716 #endif /* Not MSDOS. */
718 /* We are the parent side. Set the state to
719 say the commands are running and return. */
721 set_command_state (child
->file
, cs_running
);
723 /* Free the storage used by the child's argument list. */
726 free ((char *) argv
);
731 child
->file
->update_status
= 2;
732 notice_finished_file (child
->file
);
735 /* Try to start a child running.
736 Returns nonzero if the child was started (and maybe finished), or zero if
737 the load was too high and the child was put on the `waiting_jobs' chain. */
740 start_waiting_job (c
)
743 /* If we can start a job remotely, we always want to, and don't care about
744 the local load average. We record that the job should be started
745 remotely in C->remote for start_job_command to test. */
747 c
->remote
= start_remote_job_p ();
749 /* If this job is to be started locally, and we are already running
750 some jobs, make this one wait if the load average is too high. */
751 if (!c
->remote
&& job_slots_used
> 0 && load_too_high ())
753 /* Put this child on the chain of children waiting
754 for the load average to go down. */
755 c
->file
->command_state
= cs_running
;
756 c
->next
= waiting_jobs
;
761 /* Start the first command; reap_children will run later command lines. */
762 start_job_command (c
);
764 switch (c
->file
->command_state
)
769 printf ("Putting child 0x%08lx PID %05d%s on the chain.\n",
770 (unsigned long int) c
,
771 c
->pid
, c
->remote
? " (remote)" : "");
773 /* One more job slot is in use. */
779 /* All the command lines turned out to be empty. */
780 c
->file
->update_status
= 0;
784 notice_finished_file (c
->file
);
789 assert (c
->file
->command_state
== cs_finished
);
796 /* Create a `struct child' for FILE and start its commands running. */
800 register struct file
*file
;
802 register struct commands
*cmds
= file
->cmds
;
803 register struct child
*c
;
805 register unsigned int i
;
807 /* Let any previously decided-upon jobs that are waiting
808 for the load to go down start before this new one. */
809 start_waiting_jobs ();
811 /* Reap any children that might have finished recently. */
812 reap_children (0, 0);
814 /* Chop the commands up into lines if they aren't already. */
815 chop_commands (cmds
);
818 /* Wait for a job slot to be freed up. */
819 while (job_slots_used
== job_slots
)
820 reap_children (1, 0);
822 /* Expand the command lines and store the results in LINES. */
823 lines
= (char **) xmalloc (cmds
->ncommand_lines
* sizeof (char *));
824 for (i
= 0; i
< cmds
->ncommand_lines
; ++i
)
826 /* Collapse backslash-newline combinations that are inside variable
827 or function references. These are left alone by the parser so
828 that they will appear in the echoing of commands (where they look
829 nice); and collapsed by construct_command_argv when it tokenizes.
830 But letting them survive inside function invocations loses because
831 we don't want the functions to see them as part of the text. */
833 char *in
, *out
, *ref
;
835 /* IN points to where in the line we are scanning.
836 OUT points to where in the line we are writing.
837 When we collapse a backslash-newline combination,
838 IN gets ahead out OUT. */
840 in
= out
= cmds
->command_lines
[i
];
841 while ((ref
= index (in
, '$')) != 0)
843 ++ref
; /* Move past the $. */
846 /* Copy the text between the end of the last chunk
847 we processed (where IN points) and the new chunk
848 we are about to process (where REF points). */
849 bcopy (in
, out
, ref
- in
);
851 /* Move both pointers past the boring stuff. */
855 if (*ref
== '(' || *ref
== '{')
857 char openparen
= *ref
;
858 char closeparen
= openparen
== '(' ? ')' : '}';
862 *out
++ = *in
++; /* Copy OPENPAREN. */
863 /* IN now points past the opening paren or brace.
864 Count parens or braces until it is matched. */
868 if (*in
== closeparen
&& --count
< 0)
870 else if (*in
== '\\' && in
[1] == '\n')
872 /* We have found a backslash-newline inside a
873 variable or function reference. Eat it and
874 any following whitespace. */
877 for (p
= in
- 1; p
> ref
&& *p
== '\\'; --p
)
881 /* There were two or more backslashes, so this is
882 not really a continuation line. We don't collapse
883 the quoting backslashes here as is done in
884 collapse_continuations, because the line will
885 be collapsed again after expansion. */
889 /* Skip the backslash, newline and
890 any following whitespace. */
891 in
= next_token (in
+ 2);
893 /* Discard any preceding whitespace that has
894 already been written to the output. */
895 while (out
> ref
&& isblank (out
[-1]))
898 /* Replace it all with a single space. */
904 if (*in
== openparen
)
913 /* There are no more references in this line to worry about.
914 Copy the remaining uninteresting text to the output. */
918 /* Finally, expand the line. */
919 lines
[i
] = allocated_variable_expand_for_file (cmds
->command_lines
[i
],
923 /* Start the command sequence, record it in a new
924 `struct child', and add that to the chain. */
926 c
= (struct child
*) xmalloc (sizeof (struct child
));
928 c
->command_lines
= lines
;
933 /* Fetch the first command line to be run. */
934 if (! job_next_command (c
))
936 /* There were no commands! */
938 c
->file
->update_status
= 0;
942 /* The job is now primed. Start it running. */
943 start_waiting_job (c
);
946 /* Since there is only one job slot, make things run linearly.
947 Wait for the child to die, setting the state to `cs_finished'. */
948 while (file
->command_state
== cs_running
)
949 reap_children (1, 0);
953 /* Move CHILD's pointers to the next command for it to execute.
954 Returns nonzero if there is another command. */
957 job_next_command (child
)
960 if (child
->command_ptr
== 0 || *child
->command_ptr
== '\0')
962 /* There are no more lines in the expansion of this line. */
963 if (child
->command_line
== child
->file
->cmds
->ncommand_lines
)
965 /* There are no more lines to be expanded. */
966 child
->command_ptr
= 0;
970 /* Get the next line to run. */
971 child
->command_ptr
= child
->command_lines
[child
->command_line
++];
982 extern int getloadavg ();
985 if (max_load_average
< 0)
989 if (getloadavg (&load
, 1) != 1)
991 static int lossage
= -1;
992 /* Complain only once for the same error. */
993 if (lossage
== -1 || errno
!= lossage
)
996 /* An errno value of zero means getloadavg is just unsupported. */
997 error ("cannot enforce load limits on this operating system");
999 perror_with_name ("cannot enforce load limit: ", "getloadavg");
1006 return load
>= max_load_average
;
1010 /* Start jobs that are waiting for the load to be lower. */
1013 start_waiting_jobs ()
1017 if (waiting_jobs
== 0)
1022 /* Check for recently deceased descendants. */
1023 reap_children (0, 0);
1025 /* Take a job off the waiting list. */
1027 waiting_jobs
= job
->next
;
1029 /* Try to start that job. We break out of the loop as soon
1030 as start_waiting_job puts one back on the waiting list. */
1031 } while (start_waiting_job (job
) && waiting_jobs
!= 0);
1034 /* Replace the current process with one executing the command in ARGV.
1035 STDIN_FD and STDOUT_FD are used as the process's stdin and stdout; ENVP is
1036 the environment of the new program. This function does not return. */
1039 child_execute_job (stdin_fd
, stdout_fd
, argv
, envp
)
1040 int stdin_fd
, stdout_fd
;
1041 char **argv
, **envp
;
1044 (void) dup2 (stdin_fd
, 0);
1046 (void) dup2 (stdout_fd
, 1);
1048 /* Free up file descriptors. */
1051 int max
= getdtablesize ();
1052 for (d
= 3; d
< max
; ++d
)
1056 /* Run the command. */
1057 exec_command (argv
, envp
);
1060 /* Search PATH for FILE.
1061 If successful, store the full pathname in PROGRAM and return 1.
1062 If not sucessful, return zero. */
1065 search_path (file
, path
, program
)
1066 char *file
, *path
, *program
;
1068 if (path
== 0 || path
[0] == '\0')
1069 path
= default_path
;
1073 strpbrk (file
, "/\\:")
1079 strcpy (program
, file
);
1086 #ifdef HAVE_GETGROUPS
1087 #ifndef HAVE_UNISTD_H
1088 extern int getgroups ();
1090 static int ngroups
= -1;
1092 static GETGROUPS_T groups
[NGROUPS_MAX
];
1093 #define ngroups_max NGROUPS_MAX
1095 static GETGROUPS_T
*groups
= 0;
1096 static int ngroups_max
;
1099 ngroups_max
= GET_NGROUPS_MAX
;
1100 groups
= (GETGROUPS_T
*) malloc (ngroups_max
* sizeof (GETGROUPS_T
));
1103 if (groups
!= 0 && ngroups
== -1)
1104 ngroups
= getgroups (ngroups_max
, groups
);
1105 #endif /* Have getgroups. */
1107 len
= strlen (file
) + 1;
1114 p
= index (path
, PATH_SEPARATOR_CHAR
);
1116 p
= path
+ strlen (path
);
1119 bcopy (file
, program
, len
);
1122 bcopy (path
, program
, p
- path
);
1123 program
[p
- path
] = '/';
1124 bcopy (file
, program
+ (p
- path
) + 1, len
);
1127 if (safe_stat (program
, &st
) == 0
1128 && S_ISREG (st
.st_mode
))
1130 if (st
.st_uid
== geteuid ())
1131 perm
= (st
.st_mode
& 0100);
1132 else if (st
.st_gid
== getegid ())
1133 perm
= (st
.st_mode
& 0010);
1136 #ifdef HAVE_GETGROUPS
1138 for (i
= 0; i
< ngroups
; ++i
)
1139 if (groups
[i
] == st
.st_gid
)
1142 perm
= (st
.st_mode
& 0010);
1144 #endif /* Have getgroups. */
1145 perm
= (st
.st_mode
& 0001);
1153 } while (*path
!= '\0');
1159 /* Replace the current process with one running the command in ARGV,
1160 with environment ENVP. This function does not return. */
1163 exec_command (argv
, envp
)
1164 char **argv
, **envp
;
1171 for (ep
= envp
; *ep
!= 0; ++ep
)
1173 if (shell
== 0 && !strncmp(*ep
, "SHELL=", 6))
1175 else if (path
== 0 && !strncmp(*ep
, "PATH=", 5))
1177 else if (path
!= 0 && shell
!= 0)
1181 /* Be the user, permanently. */
1184 if (!search_path (argv
[0], path
, program
))
1185 error ("%s: Command not found", argv
[0]);
1188 /* Run the program. */
1189 execve (program
, argv
, envp
);
1191 if (errno
== ENOEXEC
)
1193 PATH_VAR (shell_program
);
1196 shell_path
= default_shell
;
1199 if (search_path (shell
, path
, shell_program
))
1200 shell_path
= shell_program
;
1204 error ("%s: Shell program not found", shell
);
1208 if (shell_path
!= 0)
1214 while (argv
[argc
] != 0)
1217 new_argv
= (char **) alloca ((1 + argc
+ 1) * sizeof (char *));
1218 new_argv
[0] = shell_path
;
1219 new_argv
[1] = program
;
1222 new_argv
[1 + argc
] = argv
[argc
];
1226 execve (shell_path
, new_argv
, envp
);
1227 perror_with_name ("execve: ", shell_path
);
1231 perror_with_name ("execve: ", program
);
1237 /* Figure out the argument list necessary to run LINE as a command.
1238 Try to avoid using a shell. This routine handles only ' quoting.
1239 Starting quotes may be escaped with a backslash. If any of the
1240 characters in sh_chars[] is seen, or any of the builtin commands
1241 listed in sh_cmds[] is the first word of a line, the shell is used.
1243 If RESTP is not NULL, *RESTP is set to point to the first newline in LINE.
1244 If *RESTP is NULL, newlines will be ignored.
1246 SHELL is the shell to use, or nil to use the default shell.
1247 IFS is the value of $IFS, or nil (meaning the default). */
1250 construct_command_argv_internal (line
, restp
, shell
, ifs
)
1251 char *line
, **restp
;
1255 static char sh_chars
[] = "\"|<>";
1256 static char *sh_cmds
[] = { "break", "call", "cd", "chcp", "chdir", "cls",
1257 "copy", "ctty", "date", "del", "dir", "echo",
1258 "erase", "exit", "for", "goto", "if", "if", "md",
1259 "mkdir", "path", "pause", "prompt", "rem", "ren",
1260 "rename", "set", "shift", "time", "type",
1261 "ver", "verify", "vol", ":", 0 };
1263 static char sh_chars
[] = "#;\"*?[]&|<>(){}$`^";
1264 static char *sh_cmds
[] = { "cd", "eval", "exec", "exit", "login",
1265 "logout", "set", "umask", "wait", "while", "for",
1266 "case", "if", ":", ".", "break", "continue",
1267 "export", "read", "readonly", "shift", "times",
1268 "trap", "switch", 0 };
1274 int instring
, word_has_equals
, seen_nonequals
;
1275 char **new_argv
= 0;
1280 /* Make sure not to bother processing an empty line. */
1281 while (isblank (*line
))
1286 /* See if it is safe to parse commands internally. */
1288 shell
= default_shell
;
1289 else if (strcmp (shell
, default_shell
))
1293 for (ap
= ifs
; *ap
!= '\0'; ++ap
)
1294 if (*ap
!= ' ' && *ap
!= '\t' && *ap
!= '\n')
1297 i
= strlen (line
) + 1;
1299 /* More than 1 arg per character is impossible. */
1300 new_argv
= (char **) xmalloc (i
* sizeof (char *));
1302 /* All the args can fit in a buffer as big as LINE is. */
1303 ap
= new_argv
[0] = (char *) xmalloc (i
);
1306 /* I is how many complete arguments have been found. */
1308 instring
= word_has_equals
= seen_nonequals
= 0;
1309 for (p
= line
; *p
!= '\0'; ++p
)
1317 /* Inside a string, just copy any char except a closing quote
1318 or a backslash-newline combination. */
1321 else if (*p
== '\\' && p
[1] == '\n')
1322 goto swallow_escaped_newline
;
1323 else if (*p
== '\n' && restp
!= NULL
)
1325 /* End of the command line. */
1332 else if (index (sh_chars
, *p
) != 0)
1333 /* Not inside a string, but it's a special char. */
1336 /* Not a special char. */
1340 /* Equals is a special character in leading words before the
1341 first word with no equals sign in it. This is not the case
1342 with sh -k, but we never get here when using nonstandard
1344 if (! seen_nonequals
)
1346 word_has_equals
= 1;
1351 /* Backslash-newline combinations are eaten. */
1354 swallow_escaped_newline
:
1356 /* Eat the backslash, the newline, and following whitespace,
1357 replacing it all with a single space. */
1360 /* If there is a tab after a backslash-newline,
1361 remove it from the source line which will be echoed,
1362 since it was most likely used to line
1363 up the continued line with the previous one. */
1371 if (ap
!= new_argv
[i
])
1372 /* Treat this as a space, ending the arg.
1373 But if it's at the beginning of the arg, it should
1374 just get eaten, rather than becoming an empty arg. */
1377 p
= next_token (p
) - 1;
1380 else if (p
[1] != '\0')
1381 /* Copy and skip the following char. */
1392 /* End of the command line. */
1397 /* Newlines are not special. */
1404 /* We have the end of an argument.
1405 Terminate the text of the argument. */
1409 /* Update SEEN_NONEQUALS, which tells us if every word
1410 heretofore has contained an `='. */
1411 seen_nonequals
|= ! word_has_equals
;
1412 if (word_has_equals
&& ! seen_nonequals
)
1413 /* An `=' in a word before the first
1414 word without one is magical. */
1416 word_has_equals
= 0; /* Prepare for the next word. */
1418 /* If this argument is the command name,
1419 see if it is a built-in shell command.
1420 If so, have the shell handle it. */
1424 for (j
= 0; sh_cmds
[j
] != 0; ++j
)
1425 if (streq (sh_cmds
[j
], new_argv
[0]))
1429 /* Ignore multiple whitespace chars. */
1431 /* Next iteration should examine the first nonwhite char. */
1443 /* Let the shell deal with an unterminated quote. */
1446 /* Terminate the last argument and the argument list. */
1449 if (new_argv
[i
][0] != '\0')
1456 for (j
= 0; sh_cmds
[j
] != 0; ++j
)
1457 if (streq (sh_cmds
[j
], new_argv
[0]))
1461 if (new_argv
[0] == 0)
1462 /* Line was empty. */
1468 /* We must use the shell. */
1472 /* Free the old argument list we were working on. */
1483 dos_bname
= tempnam (".", "mk");
1484 for (i
= 0; dos_bname
[i
] != '\0'; ++i
)
1485 if (dos_bname
[i
] == '/')
1486 dos_bname
[i
] = '\\';
1487 dos_bename
= (char *) xmalloc (strlen (dos_bname
) + 5);
1488 strcpy (dos_bename
, dos_bname
);
1489 strcat (dos_bname
, ".bat");
1490 strcat (dos_bename
, ".err");
1492 batch
= fopen(bename
, "w"); /* Create a file. */
1495 batch
= fopen (dos_bname
, "w");
1496 fputs ("@echo off\n", batch
);
1497 fputs (line
, batch
);
1498 fprintf (batch
, "\nif errorlevel 1 del %s\n", dos_bename
);
1500 new_argv
= (char **) xmalloc(2 * sizeof(char *));
1501 new_argv
[0] = strdup (bname
);
1504 #else /* Not MSDOS. */
1506 /* SHELL may be a multi-word command. Construct a command line
1507 "SHELL -c LINE", with all special chars in LINE escaped.
1508 Then recurse, expanding this command line to get the final
1511 unsigned int shell_len
= strlen (shell
);
1512 static char minus_c
[] = " -c ";
1513 unsigned int line_len
= strlen (line
);
1515 char *new_line
= (char *) alloca (shell_len
+ (sizeof (minus_c
) - 1)
1516 + (line_len
* 2) + 1);
1519 bcopy (shell
, ap
, shell_len
);
1521 bcopy (minus_c
, ap
, sizeof (minus_c
) - 1);
1522 ap
+= sizeof (minus_c
) - 1;
1523 for (p
= line
; *p
!= '\0'; ++p
)
1525 if (restp
!= NULL
&& *p
== '\n')
1530 else if (*p
== '\\' && p
[1] == '\n')
1532 /* Eat the backslash, the newline, and following whitespace,
1533 replacing it all with a single space (which is escaped
1537 /* If there is a tab after a backslash-newline,
1538 remove it from the source line which will be echoed,
1539 since it was most likely used to line
1540 up the continued line with the previous one. */
1551 if (*p
== '\\' || *p
== '\''
1553 || index (sh_chars
, *p
) != 0)
1559 new_argv
= construct_command_argv_internal (new_line
, (char **) NULL
,
1560 (char *) 0, (char *) 0);
1567 /* Figure out the argument list necessary to run LINE as a command.
1568 Try to avoid using a shell. This routine handles only ' quoting.
1569 Starting quotes may be escaped with a backslash. If any of the
1570 characters in sh_chars[] is seen, or any of the builtin commands
1571 listed in sh_cmds[] is the first word of a line, the shell is used.
1573 If RESTP is not NULL, *RESTP is set to point to the first newline in LINE.
1574 If *RESTP is NULL, newlines will be ignored.
1576 FILE is the target whose commands these are. It is used for
1577 variable expansion for $(SHELL) and $(IFS). */
1580 construct_command_argv (line
, restp
, file
)
1581 char *line
, **restp
;
1588 /* Turn off --warn-undefined-variables while we expand SHELL and IFS. */
1589 int save
= warn_undefined_variables_flag
;
1590 warn_undefined_variables_flag
= 0;
1592 shell
= allocated_variable_expand_for_file ("$(SHELL)", file
);
1593 ifs
= allocated_variable_expand_for_file ("$(IFS)", file
);
1595 warn_undefined_variables_flag
= save
;
1598 argv
= construct_command_argv_internal (line
, restp
, shell
, ifs
);