1 /* Job execution and handling for GNU Make.
2 Copyright (C) 1988, 89, 90, 91, 92, 93, 94, 1995 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 shell to use. */
27 char default_shell
[] = "/bin/sh";
31 static int dos_pid
= 123;
32 static int dos_status
;
33 static char *dos_bname
;
34 static char *dos_bename
;
35 static int dos_batch_file
;
45 /* If NGROUPS_MAX == 0 then try other methods for finding a real value. */
46 #if defined (NGROUPS_MAX) && NGROUPS_MAX == 0
48 #endif /* NGROUPS_MAX == 0 */
52 #define GET_NGROUPS_MAX sysconf (_SC_NGROUPS_MAX)
53 #else /* Not POSIX. */
54 #define NGROUPS_MAX NGROUPS
58 #ifdef HAVE_SYS_WAIT_H
63 #define WAIT_NOHANG(status) waitpid (-1, (status), WNOHANG)
64 #else /* Don't have waitpid. */
69 #define WAIT_NOHANG(status) wait3 ((status), WNOHANG, (struct rusage *) 0)
70 #endif /* Have wait3. */
71 #endif /* Have waitpid. */
73 #if !defined (wait) && !defined (POSIX)
77 #ifndef HAVE_UNION_WAIT
82 #define WTERMSIG(x) ((x) & 0x7f)
85 #define WCOREDUMP(x) ((x) & 0x80)
88 #define WEXITSTATUS(x) (((x) >> 8) & 0xff)
91 #define WIFSIGNALED(x) (WTERMSIG (x) != 0)
94 #define WIFEXITED(x) (WTERMSIG (x) == 0)
97 #else /* Have `union wait'. */
99 #define WAIT_T union wait
101 #define WTERMSIG(x) ((x).w_termsig)
104 #define WCOREDUMP(x) ((x).w_coredump)
107 #define WEXITSTATUS(x) ((x).w_retcode)
110 #define WIFSIGNALED(x) (WTERMSIG(x) != 0)
113 #define WIFEXITED(x) (WTERMSIG(x) == 0)
116 #endif /* Don't have `union wait'. */
119 #ifndef HAVE_UNISTD_H
121 extern int execve ();
122 extern void _exit ();
123 extern int geteuid (), getegid ();
124 extern int setgid (), getgid ();
127 extern int getloadavg ();
128 extern int start_remote_job_p ();
129 extern int start_remote_job (), remote_status ();
131 RETSIGTYPE
child_handler ();
132 static void free_child (), start_job_command ();
133 static int load_too_high (), job_next_command ();
135 /* Chain of all live (or recently deceased) children. */
137 struct child
*children
= 0;
139 /* Number of children currently running. */
141 unsigned int job_slots_used
= 0;
143 /* Nonzero if the `good' standard input is in use. */
145 static int good_stdin_used
= 0;
147 /* Chain of children waiting to run until the load average goes down. */
149 static struct child
*waiting_jobs
= 0;
151 /* Write an error message describing the exit status given in
152 EXIT_CODE, EXIT_SIG, and COREDUMP, for the target TARGET_NAME.
153 Append "(ignored)" if IGNORED is nonzero. */
156 child_error (target_name
, exit_code
, exit_sig
, coredump
, ignored
)
158 int exit_code
, exit_sig
, coredump
;
161 if (ignored
&& silent_flag
)
165 error (ignored
? "[%s] Error %d (ignored)" :
167 target_name
, exit_code
);
169 error ("*** [%s] %s%s",
170 target_name
, strsignal (exit_sig
),
171 coredump
? " (core dumped)" : "");
174 static unsigned int dead_children
= 0;
176 /* Notice that a child died.
177 reap_children should be called when convenient. */
185 printf ("Got a SIGCHLD; %d unreaped children.\n", dead_children
);
188 extern int shell_function_pid
, shell_function_completed
;
190 /* Reap dead children, storing the returned status and the new command
191 state (`cs_finished') in the `file' member of the `struct child' for the
192 dead child, and removing the child from the chain. If BLOCK nonzero,
193 reap at least one child, waiting for it to die if necessary. If ERR is
194 nonzero, print an error message first. */
197 reap_children (block
, err
)
202 while ((children
!= 0 || shell_function_pid
!= 0) &&
203 (block
|| dead_children
> 0))
207 int exit_code
, exit_sig
, coredump
;
208 register struct child
*lastc
, *c
;
210 int any_remote
, any_local
;
212 if (err
&& dead_children
== 0)
214 /* We might block for a while, so let the user know why. */
216 error ("*** Waiting for unfinished jobs....");
219 /* We have one less dead child to reap.
220 The test and decrement are not atomic; if it is compiled into:
221 register = dead_children - 1;
222 dead_children = register;
223 a SIGCHLD could come between the two instructions.
224 child_handler increments dead_children.
225 The second instruction here would lose that increment. But the
226 only effect of dead_children being wrong is that we might wait
227 longer than necessary to reap a child, and lose some parallelism;
228 and we might print the "Waiting for unfinished jobs" message above
229 when not necessary. */
231 if (dead_children
!= 0)
235 any_local
= shell_function_pid
!= -1;
236 for (c
= children
; c
!= 0; c
= c
->next
)
238 any_remote
|= c
->remote
;
239 any_local
|= ! c
->remote
;
241 printf ("Live child 0x%08lx PID %d%s\n",
242 (unsigned long int) c
,
243 c
->pid
, c
->remote
? " (remote)" : "");
246 /* First, check for remote children. */
248 pid
= remote_status (&exit_code
, &exit_sig
, &coredump
, 0);
258 pfatal_with_name ("remote_status");
263 /* No remote children. Check for local children. */
269 pid
= WAIT_NOHANG (&status
);
272 pid
= wait (&status
);
283 pfatal_with_name ("wait");
287 /* No local children. */
288 if (block
&& any_remote
)
290 /* Now try a blocking wait for a remote child. */
291 pid
= remote_status (&exit_code
, &exit_sig
, &coredump
, 1);
293 goto remote_status_lose
;
295 /* No remote children either. Finally give up. */
298 /* We got a remote child. */
306 /* Chop the status word up. */
307 exit_code
= WEXITSTATUS (status
);
308 exit_sig
= WIFSIGNALED (status
) ? WTERMSIG (status
) : 0;
309 coredump
= WCOREDUMP (status
);
312 /* Life is very different on MSDOS. */
315 exit_code
= dos_status
;
318 #endif /* Not MSDOS. */
321 /* We got a remote child. */
324 /* Check if this is the child of the `shell' function. */
325 if (!remote
&& pid
== shell_function_pid
)
327 /* It is. Leave an indicator for the `shell' function. */
328 if (exit_sig
== 0 && exit_code
== 127)
329 shell_function_completed
= -1;
331 shell_function_completed
= 1;
335 child_failed
= exit_sig
!= 0 || exit_code
!= 0;
337 /* Search for a child matching the deceased one. */
339 for (c
= children
; c
!= 0; lastc
= c
, c
= c
->next
)
340 if (c
->remote
== remote
&& c
->pid
== pid
)
345 /* An unknown child died. */
347 sprintf (buf
, "Unknown%s job %d", remote
? " remote" : "", pid
);
349 child_error (buf
, exit_code
, exit_sig
, coredump
,
352 error ("%s finished.", buf
);
357 printf ("Reaping %s child 0x%08lx PID %d%s\n",
358 child_failed
? "losing" : "winning",
359 (unsigned long int) c
,
360 c
->pid
, c
->remote
? " (remote)" : "");
362 /* If this child had the good stdin, say it is now free. */
366 if (child_failed
&& !c
->noerror
&& !ignore_errors_flag
)
368 /* The commands failed. Write an error message,
369 delete non-precious targets, and abort. */
370 static int delete_on_error
= -1;
371 child_error (c
->file
->name
, exit_code
, exit_sig
, coredump
, 0);
372 c
->file
->update_status
= 2;
373 if (delete_on_error
== -1)
375 struct file
*f
= lookup_file (".DELETE_ON_ERROR");
376 delete_on_error
= f
!= 0 && f
->is_target
;
378 if (exit_sig
!= 0 || delete_on_error
)
379 delete_child_targets (c
);
385 /* The commands failed, but we don't care. */
386 child_error (c
->file
->name
,
387 exit_code
, exit_sig
, coredump
, 1);
391 /* If there are more commands to run, try to start them. */
392 if (job_next_command (c
))
394 if (handling_fatal_signal
)
396 /* Never start new commands while we are dying.
397 Since there are more commands that wanted to be run,
398 the target was not completely remade. So we treat
399 this as if a command had failed. */
400 c
->file
->update_status
= 2;
404 /* Check again whether to start remotely.
405 Whether or not we want to changes over time.
406 Also, start_remote_job may need state set up
407 by start_remote_job_p. */
408 c
->remote
= start_remote_job_p ();
409 start_job_command (c
);
410 if (c
->file
->command_state
== cs_running
)
411 /* We successfully started the new command.
412 Loop to reap more children. */
416 if (c
->file
->update_status
!= 0)
417 /* We failed to start the commands. */
418 delete_child_targets (c
);
421 /* There are no more commands. We got through them all
422 without an unignored error. Now the target has been
423 successfully updated. */
424 c
->file
->update_status
= 0;
427 /* When we get here, all the commands for C->file are finished
428 (or aborted) and C->file->update_status contains 0 or 2. But
429 C->file->command_state is still cs_running if all the commands
430 ran; notice_finish_file looks for cs_running to tell it that
431 it's interesting to check the file's modtime again now. */
433 if (! handling_fatal_signal
)
434 /* Notice if the target of the commands has been changed.
435 This also propagates its values for command_state and
436 update_status to its also_make files. */
437 notice_finished_file (c
->file
);
440 printf ("Removing child 0x%08lx PID %d%s from chain.\n",
441 (unsigned long int) c
,
442 c
->pid
, c
->remote
? " (remote)" : "");
444 /* Remove the child from the chain and free it. */
448 lastc
->next
= c
->next
;
449 if (! handling_fatal_signal
) /* Avoid nonreentrancy. */
452 /* There is now another slot open. */
455 /* If the job failed, and the -k flag was not given, die,
456 unless we are already in the process of dying. */
457 if (!err
&& child_failed
&& !keep_going_flag
)
461 /* Only block for one child. */
466 /* Free the storage allocated for CHILD. */
470 register struct child
*child
;
472 if (child
->command_lines
!= 0)
474 register unsigned int i
;
475 for (i
= 0; i
< child
->file
->cmds
->ncommand_lines
; ++i
)
476 free (child
->command_lines
[i
]);
477 free ((char *) child
->command_lines
);
480 if (child
->environment
!= 0)
482 register char **ep
= child
->environment
;
485 free ((char *) child
->environment
);
488 free ((char *) child
);
499 extern sigset_t fatal_signal_set
;
505 sigemptyset (&empty
);
506 sigprocmask (SIG_SETMASK
, &empty
, (sigset_t
*) 0);
511 /* Start a job to run the commands specified in CHILD.
512 CHILD is updated to reflect the commands and ID of the child process. */
515 start_job_command (child
)
516 register struct child
*child
;
518 static int bad_stdin
= -1;
523 /* Combine the flags parsed for the line itself with
524 the flags specified globally for this target. */
525 flags
= (child
->file
->command_flags
526 | child
->file
->cmds
->lines_flags
[child
->command_line
- 1]);
528 p
= child
->command_ptr
;
529 child
->noerror
= flags
& COMMANDS_NOERROR
;
533 flags
|= COMMANDS_SILENT
;
535 flags
|= COMMANDS_RECURSE
;
538 else if (!isblank (*p
) && *p
!= '+')
543 /* If -q was given, just say that updating `failed'. The exit status of
544 1 tells the user that -q is saying `something to do'; the exit status
545 for a random error is 2. */
546 if (question_flag
&& !(flags
& COMMANDS_RECURSE
))
548 child
->file
->update_status
= 1;
549 notice_finished_file (child
->file
);
553 /* There may be some preceding whitespace left if there
554 was nothing but a backslash on the first line. */
557 /* Figure out an argument list from this command line. */
561 argv
= construct_command_argv (p
, &end
, child
->file
);
563 child
->command_ptr
= NULL
;
567 child
->command_ptr
= end
;
571 if (touch_flag
&& !(flags
& COMMANDS_RECURSE
))
573 /* Go on to the next command. It might be the recursive one.
574 We construct ARGV only to find the end of the command line. */
576 free ((char *) argv
);
583 /* This line has no commands. Go to the next. */
584 if (job_next_command (child
))
585 start_job_command (child
);
588 /* No more commands. All done. */
589 child
->file
->update_status
= 0;
590 notice_finished_file (child
->file
);
595 /* Print out the command. If silent, we call `message' with null so it
596 can log the working directory before the command's own error messages
599 message ((just_print_flag
|| (!(flags
& COMMANDS_SILENT
) && !silent_flag
))
600 ? (char *) 0 : "%s", p
);
602 /* Tell update_goal_chain that a command has been started on behalf of
603 this target. It is important that this happens here and not in
604 reap_children (where we used to do it), because reap_children might be
605 reaping children from a different target. We want this increment to
606 guaranteedly indicate that a command was started for the dependency
607 chain (i.e., update_file recursion chain) we are processing. */
611 /* If -n was given, recurse to get the next line in the sequence. */
613 if (just_print_flag
&& !(flags
& COMMANDS_RECURSE
))
616 free ((char *) argv
);
620 /* Flush the output streams so they won't have things written twice. */
625 /* Set up a bad standard input that reads from a broken pipe. */
629 /* Make a file descriptor that is the read end of a broken pipe.
630 This will be used for some children's standard inputs. */
634 /* Close the write side. */
635 (void) close (pd
[1]);
636 /* Save the read side. */
639 /* Set the descriptor to close on exec, so it does not litter any
640 child's descriptor table. When it is dup2'd onto descriptor 0,
641 that descriptor will not close on exec. */
646 (void) fcntl (bad_stdin
, F_SETFD
, FD_CLOEXEC
);
651 /* Decide whether to give this child the `good' standard input
652 (one that points to the terminal or whatever), or the `bad' one
653 that points to the read side of a broken pipe. */
655 child
->good_stdin
= !good_stdin_used
;
656 if (child
->good_stdin
)
661 /* Set up the environment for the child. */
662 if (child
->environment
== 0)
663 child
->environment
= target_environment (child
->file
);
667 /* start_waiting_job has set CHILD->remote if we can start a remote job. */
670 int is_remote
, id
, used_stdin
;
671 if (start_remote_job (argv
, child
->environment
,
672 child
->good_stdin
? 0 : bad_stdin
,
673 &is_remote
, &id
, &used_stdin
))
677 if (child
->good_stdin
&& !used_stdin
)
679 child
->good_stdin
= 0;
682 child
->remote
= is_remote
;
688 /* Fork the child process. */
690 char **parent_environ
;
693 (void) sigprocmask (SIG_BLOCK
, &fatal_signal_set
, (sigset_t
*) 0);
695 #ifdef HAVE_SIGSETMASK
696 (void) sigblock (fatal_signal_mask
);
701 parent_environ
= environ
;
702 child
->pid
= vfork ();
703 environ
= parent_environ
; /* Restore value child may have clobbered. */
706 /* We are the child side. */
708 child_execute_job (child
->good_stdin
? 0 : bad_stdin
, 1,
709 argv
, child
->environment
);
711 else if (child
->pid
< 0)
715 perror_with_name ("vfork", "");
721 dos_status
= spawnvpe (P_WAIT
, argv
[0], argv
, child
->environment
);
723 child
->pid
= dos_pid
++;
727 remove (dos_bname
); /* Ignore errors. */
728 if (access (dos_bename
, 0))
734 #endif /* Not MSDOS. */
736 /* We are the parent side. Set the state to
737 say the commands are running and return. */
739 set_command_state (child
->file
, cs_running
);
741 /* Free the storage used by the child's argument list. */
744 free ((char *) argv
);
749 child
->file
->update_status
= 2;
750 notice_finished_file (child
->file
);
753 /* Try to start a child running.
754 Returns nonzero if the child was started (and maybe finished), or zero if
755 the load was too high and the child was put on the `waiting_jobs' chain. */
758 start_waiting_job (c
)
761 /* If we can start a job remotely, we always want to, and don't care about
762 the local load average. We record that the job should be started
763 remotely in C->remote for start_job_command to test. */
765 c
->remote
= start_remote_job_p ();
767 /* If this job is to be started locally, and we are already running
768 some jobs, make this one wait if the load average is too high. */
769 if (!c
->remote
&& job_slots_used
> 0 && load_too_high ())
771 /* Put this child on the chain of children waiting
772 for the load average to go down. */
773 set_command_state (c
->file
, cs_running
);
774 c
->next
= waiting_jobs
;
779 /* Start the first command; reap_children will run later command lines. */
780 start_job_command (c
);
782 switch (c
->file
->command_state
)
787 printf ("Putting child 0x%08lx PID %05d%s on the chain.\n",
788 (unsigned long int) c
,
789 c
->pid
, c
->remote
? " (remote)" : "");
791 /* One more job slot is in use. */
797 /* All the command lines turned out to be empty. */
798 c
->file
->update_status
= 0;
802 notice_finished_file (c
->file
);
807 assert (c
->file
->command_state
== cs_finished
);
814 /* Create a `struct child' for FILE and start its commands running. */
818 register struct file
*file
;
820 register struct commands
*cmds
= file
->cmds
;
821 register struct child
*c
;
823 register unsigned int i
;
825 /* Let any previously decided-upon jobs that are waiting
826 for the load to go down start before this new one. */
827 start_waiting_jobs ();
829 /* Reap any children that might have finished recently. */
830 reap_children (0, 0);
832 /* Chop the commands up into lines if they aren't already. */
833 chop_commands (cmds
);
836 /* Wait for a job slot to be freed up. */
837 while (job_slots_used
== job_slots
)
838 reap_children (1, 0);
840 /* Expand the command lines and store the results in LINES. */
841 lines
= (char **) xmalloc (cmds
->ncommand_lines
* sizeof (char *));
842 for (i
= 0; i
< cmds
->ncommand_lines
; ++i
)
844 /* Collapse backslash-newline combinations that are inside variable
845 or function references. These are left alone by the parser so
846 that they will appear in the echoing of commands (where they look
847 nice); and collapsed by construct_command_argv when it tokenizes.
848 But letting them survive inside function invocations loses because
849 we don't want the functions to see them as part of the text. */
851 char *in
, *out
, *ref
;
853 /* IN points to where in the line we are scanning.
854 OUT points to where in the line we are writing.
855 When we collapse a backslash-newline combination,
856 IN gets ahead out OUT. */
858 in
= out
= cmds
->command_lines
[i
];
859 while ((ref
= index (in
, '$')) != 0)
861 ++ref
; /* Move past the $. */
864 /* Copy the text between the end of the last chunk
865 we processed (where IN points) and the new chunk
866 we are about to process (where REF points). */
867 bcopy (in
, out
, ref
- in
);
869 /* Move both pointers past the boring stuff. */
873 if (*ref
== '(' || *ref
== '{')
875 char openparen
= *ref
;
876 char closeparen
= openparen
== '(' ? ')' : '}';
880 *out
++ = *in
++; /* Copy OPENPAREN. */
881 /* IN now points past the opening paren or brace.
882 Count parens or braces until it is matched. */
886 if (*in
== closeparen
&& --count
< 0)
888 else if (*in
== '\\' && in
[1] == '\n')
890 /* We have found a backslash-newline inside a
891 variable or function reference. Eat it and
892 any following whitespace. */
895 for (p
= in
- 1; p
> ref
&& *p
== '\\'; --p
)
899 /* There were two or more backslashes, so this is
900 not really a continuation line. We don't collapse
901 the quoting backslashes here as is done in
902 collapse_continuations, because the line will
903 be collapsed again after expansion. */
907 /* Skip the backslash, newline and
908 any following whitespace. */
909 in
= next_token (in
+ 2);
911 /* Discard any preceding whitespace that has
912 already been written to the output. */
913 while (out
> ref
&& isblank (out
[-1]))
916 /* Replace it all with a single space. */
922 if (*in
== openparen
)
931 /* There are no more references in this line to worry about.
932 Copy the remaining uninteresting text to the output. */
936 /* Finally, expand the line. */
937 lines
[i
] = allocated_variable_expand_for_file (cmds
->command_lines
[i
],
941 /* Start the command sequence, record it in a new
942 `struct child', and add that to the chain. */
944 c
= (struct child
*) xmalloc (sizeof (struct child
));
946 c
->command_lines
= lines
;
951 /* Fetch the first command line to be run. */
952 job_next_command (c
);
954 /* The job is now primed. Start it running.
955 (This will notice if there are in fact no commands.) */
956 start_waiting_job (c
);
959 /* Since there is only one job slot, make things run linearly.
960 Wait for the child to die, setting the state to `cs_finished'. */
961 while (file
->command_state
== cs_running
)
962 reap_children (1, 0);
965 /* Move CHILD's pointers to the next command for it to execute.
966 Returns nonzero if there is another command. */
969 job_next_command (child
)
972 while (child
->command_ptr
== 0 || *child
->command_ptr
== '\0')
974 /* There are no more lines in the expansion of this line. */
975 if (child
->command_line
== child
->file
->cmds
->ncommand_lines
)
977 /* There are no more lines to be expanded. */
978 child
->command_ptr
= 0;
982 /* Get the next line to run. */
983 child
->command_ptr
= child
->command_lines
[child
->command_line
++];
994 extern int getloadavg ();
997 if (max_load_average
< 0)
1001 if (getloadavg (&load
, 1) != 1)
1003 static int lossage
= -1;
1004 /* Complain only once for the same error. */
1005 if (lossage
== -1 || errno
!= lossage
)
1008 /* An errno value of zero means getloadavg is just unsupported. */
1009 error ("cannot enforce load limits on this operating system");
1011 perror_with_name ("cannot enforce load limit: ", "getloadavg");
1018 return load
>= max_load_average
;
1022 /* Start jobs that are waiting for the load to be lower. */
1025 start_waiting_jobs ()
1029 if (waiting_jobs
== 0)
1034 /* Check for recently deceased descendants. */
1035 reap_children (0, 0);
1037 /* Take a job off the waiting list. */
1039 waiting_jobs
= job
->next
;
1041 /* Try to start that job. We break out of the loop as soon
1042 as start_waiting_job puts one back on the waiting list. */
1043 } while (start_waiting_job (job
) && waiting_jobs
!= 0);
1046 /* Replace the current process with one executing the command in ARGV.
1047 STDIN_FD and STDOUT_FD are used as the process's stdin and stdout; ENVP is
1048 the environment of the new program. This function does not return. */
1051 child_execute_job (stdin_fd
, stdout_fd
, argv
, envp
)
1052 int stdin_fd
, stdout_fd
;
1053 char **argv
, **envp
;
1056 (void) dup2 (stdin_fd
, 0);
1058 (void) dup2 (stdout_fd
, 1);
1060 (void) close (stdin_fd
);
1062 (void) close (stdout_fd
);
1064 /* Run the command. */
1065 exec_command (argv
, envp
);
1068 /* Replace the current process with one running the command in ARGV,
1069 with environment ENVP. This function does not return. */
1072 exec_command (argv
, envp
)
1073 char **argv
, **envp
;
1075 /* Be the user, permanently. */
1078 /* Run the program. */
1080 execvp (argv
[0], argv
);
1085 error ("%s: Command not found", argv
[0]);
1089 /* The file is not executable. Try it as a shell script. */
1090 extern char *getenv ();
1095 shell
= getenv ("SHELL");
1097 shell
= default_shell
;
1100 while (argv
[argc
] != 0)
1103 new_argv
= (char **) alloca ((1 + argc
+ 1) * sizeof (char *));
1104 new_argv
[0] = shell
;
1105 new_argv
[1] = argv
[0];
1108 new_argv
[1 + argc
] = argv
[argc
];
1112 execvp (shell
, new_argv
);
1113 if (errno
== ENOENT
)
1114 error ("%s: Shell program not found", shell
);
1116 perror_with_name ("execvp: ", shell
);
1121 perror_with_name ("execvp: ", argv
[0]);
1128 /* Figure out the argument list necessary to run LINE as a command. Try to
1129 avoid using a shell. This routine handles only ' quoting, and " quoting
1130 when no backslash, $ or ` characters are seen in the quotes. Starting
1131 quotes may be escaped with a backslash. If any of the characters in
1132 sh_chars[] is seen, or any of the builtin commands listed in sh_cmds[]
1133 is the first word of a line, the shell is used.
1135 If RESTP is not NULL, *RESTP is set to point to the first newline in LINE.
1136 If *RESTP is NULL, newlines will be ignored.
1138 SHELL is the shell to use, or nil to use the default shell.
1139 IFS is the value of $IFS, or nil (meaning the default). */
1142 construct_command_argv_internal (line
, restp
, shell
, ifs
)
1143 char *line
, **restp
;
1147 static char sh_chars
[] = "\"|<>";
1148 static char *sh_cmds
[] = { "break", "call", "cd", "chcp", "chdir", "cls",
1149 "copy", "ctty", "date", "del", "dir", "echo",
1150 "erase", "exit", "for", "goto", "if", "if", "md",
1151 "mkdir", "path", "pause", "prompt", "rem", "ren",
1152 "rename", "set", "shift", "time", "type",
1153 "ver", "verify", "vol", ":", 0 };
1155 static char sh_chars
[] = "#;\"*?[]&|<>(){}$`^";
1156 static char *sh_cmds
[] = { "cd", "eval", "exec", "exit", "login",
1157 "logout", "set", "umask", "wait", "while", "for",
1158 "case", "if", ":", ".", "break", "continue",
1159 "export", "read", "readonly", "shift", "times",
1160 "trap", "switch", 0 };
1166 int instring
, word_has_equals
, seen_nonequals
;
1167 char **new_argv
= 0;
1172 /* Make sure not to bother processing an empty line. */
1173 while (isblank (*line
))
1178 /* See if it is safe to parse commands internally. */
1180 shell
= default_shell
;
1181 else if (strcmp (shell
, default_shell
))
1185 for (ap
= ifs
; *ap
!= '\0'; ++ap
)
1186 if (*ap
!= ' ' && *ap
!= '\t' && *ap
!= '\n')
1189 i
= strlen (line
) + 1;
1191 /* More than 1 arg per character is impossible. */
1192 new_argv
= (char **) xmalloc (i
* sizeof (char *));
1194 /* All the args can fit in a buffer as big as LINE is. */
1195 ap
= new_argv
[0] = (char *) xmalloc (i
);
1198 /* I is how many complete arguments have been found. */
1200 instring
= word_has_equals
= seen_nonequals
= 0;
1201 for (p
= line
; *p
!= '\0'; ++p
)
1209 /* Inside a string, just copy any char except a closing quote
1210 or a backslash-newline combination. */
1213 else if (*p
== '\\' && p
[1] == '\n')
1214 goto swallow_escaped_newline
;
1215 else if (*p
== '\n' && restp
!= NULL
)
1217 /* End of the command line. */
1221 /* Backslash, $, and ` are special inside double quotes.
1222 If we see any of those, punt. */
1223 else if (instring
== '"' && index ("\\$`", *p
) != 0)
1228 else if (index (sh_chars
, *p
) != 0)
1229 /* Not inside a string, but it's a special char. */
1232 /* Not a special char. */
1236 /* Equals is a special character in leading words before the
1237 first word with no equals sign in it. This is not the case
1238 with sh -k, but we never get here when using nonstandard
1240 if (! seen_nonequals
)
1242 word_has_equals
= 1;
1247 /* Backslash-newline combinations are eaten. */
1250 swallow_escaped_newline
:
1252 /* Eat the backslash, the newline, and following whitespace,
1253 replacing it all with a single space. */
1256 /* If there is a tab after a backslash-newline,
1257 remove it from the source line which will be echoed,
1258 since it was most likely used to line
1259 up the continued line with the previous one. */
1267 if (ap
!= new_argv
[i
])
1268 /* Treat this as a space, ending the arg.
1269 But if it's at the beginning of the arg, it should
1270 just get eaten, rather than becoming an empty arg. */
1273 p
= next_token (p
) - 1;
1276 else if (p
[1] != '\0')
1277 /* Copy and skip the following char. */
1289 /* End of the command line. */
1294 /* Newlines are not special. */
1301 /* We have the end of an argument.
1302 Terminate the text of the argument. */
1306 /* Update SEEN_NONEQUALS, which tells us if every word
1307 heretofore has contained an `='. */
1308 seen_nonequals
|= ! word_has_equals
;
1309 if (word_has_equals
&& ! seen_nonequals
)
1310 /* An `=' in a word before the first
1311 word without one is magical. */
1313 word_has_equals
= 0; /* Prepare for the next word. */
1315 /* If this argument is the command name,
1316 see if it is a built-in shell command.
1317 If so, have the shell handle it. */
1321 for (j
= 0; sh_cmds
[j
] != 0; ++j
)
1322 if (streq (sh_cmds
[j
], new_argv
[0]))
1326 /* Ignore multiple whitespace chars. */
1328 /* Next iteration should examine the first nonwhite char. */
1340 /* Let the shell deal with an unterminated quote. */
1343 /* Terminate the last argument and the argument list. */
1346 if (new_argv
[i
][0] != '\0')
1353 for (j
= 0; sh_cmds
[j
] != 0; ++j
)
1354 if (streq (sh_cmds
[j
], new_argv
[0]))
1358 if (new_argv
[0] == 0)
1359 /* Line was empty. */
1365 /* We must use the shell. */
1369 /* Free the old argument list we were working on. */
1380 dos_bname
= tempnam (".", "mk");
1381 for (i
= 0; dos_bname
[i
] != '\0'; ++i
)
1382 if (dos_bname
[i
] == '/')
1383 dos_bname
[i
] = '\\';
1384 dos_bename
= (char *) xmalloc (strlen (dos_bname
) + 5);
1385 strcpy (dos_bename
, dos_bname
);
1386 strcat (dos_bname
, ".bat");
1387 strcat (dos_bename
, ".err");
1389 batch
= fopen (dos_bename
, "w"); /* Create a file. */
1392 batch
= fopen (dos_bname
, "w");
1393 fputs ("@echo off\n", batch
);
1394 fputs (line
, batch
);
1395 fprintf (batch
, "\nif errorlevel 1 del %s\n", dos_bename
);
1397 new_argv
= (char **) xmalloc(2 * sizeof(char *));
1398 new_argv
[0] = strdup (dos_bname
);
1401 #else /* Not MSDOS. */
1403 /* SHELL may be a multi-word command. Construct a command line
1404 "SHELL -c LINE", with all special chars in LINE escaped.
1405 Then recurse, expanding this command line to get the final
1408 unsigned int shell_len
= strlen (shell
);
1409 static char minus_c
[] = " -c ";
1410 unsigned int line_len
= strlen (line
);
1412 char *new_line
= (char *) alloca (shell_len
+ (sizeof (minus_c
) - 1)
1413 + (line_len
* 2) + 1);
1416 bcopy (shell
, ap
, shell_len
);
1418 bcopy (minus_c
, ap
, sizeof (minus_c
) - 1);
1419 ap
+= sizeof (minus_c
) - 1;
1420 for (p
= line
; *p
!= '\0'; ++p
)
1422 if (restp
!= NULL
&& *p
== '\n')
1427 else if (*p
== '\\' && p
[1] == '\n')
1429 /* Eat the backslash, the newline, and following whitespace,
1430 replacing it all with a single space (which is escaped
1434 /* If there is a tab after a backslash-newline,
1435 remove it from the source line which will be echoed,
1436 since it was most likely used to line
1437 up the continued line with the previous one. */
1448 if (*p
== '\\' || *p
== '\'' || *p
== '"'
1450 || index (sh_chars
, *p
) != 0)
1456 new_argv
= construct_command_argv_internal (new_line
, (char **) NULL
,
1457 (char *) 0, (char *) 0);
1464 /* Figure out the argument list necessary to run LINE as a command. Try to
1465 avoid using a shell. This routine handles only ' quoting, and " quoting
1466 when no backslash, $ or ` characters are seen in the quotes. Starting
1467 quotes may be escaped with a backslash. If any of the characters in
1468 sh_chars[] is seen, or any of the builtin commands listed in sh_cmds[]
1469 is the first word of a line, the shell is used.
1471 If RESTP is not NULL, *RESTP is set to point to the first newline in LINE.
1472 If *RESTP is NULL, newlines will be ignored.
1474 FILE is the target whose commands these are. It is used for
1475 variable expansion for $(SHELL) and $(IFS). */
1478 construct_command_argv (line
, restp
, file
)
1479 char *line
, **restp
;
1486 /* Turn off --warn-undefined-variables while we expand SHELL and IFS. */
1487 int save
= warn_undefined_variables_flag
;
1488 warn_undefined_variables_flag
= 0;
1490 shell
= allocated_variable_expand_for_file ("$(SHELL)", file
);
1491 ifs
= allocated_variable_expand_for_file ("$(IFS)", file
);
1493 warn_undefined_variables_flag
= save
;
1496 argv
= construct_command_argv_internal (line
, restp
, shell
, ifs
);