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gcc.gnu.org Git - gcc.git/blob - gcc/pexecute.c
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1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
2 with other subprocesses), and wait for it.
3 Copyright (C) 1996, 1997 Free Software Foundation, Inc.
5 This file is part of the libiberty library.
6 Libiberty is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public
8 License as published by the Free Software Foundation; either
9 version 2 of the License, or (at your option) any later version.
11 Libiberty is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with libiberty; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* This file exports two functions: pexecute and pwait. */
23 /* This file lives in at least two places: libiberty and gcc.
24 Don't change one without the other. */
34 #include "gansidecl.h"
35 /* ??? Need to find a suitable header file. */
36 #define PEXECUTE_FIRST 1
37 #define PEXECUTE_LAST 2
38 #define PEXECUTE_ONE (PEXECUTE_FIRST + PEXECUTE_LAST)
39 #define PEXECUTE_SEARCH 4
40 #define PEXECUTE_VERBOSE 8
42 #include "libiberty.h"
45 /* stdin file number. */
46 #define STDIN_FILE_NO 0
48 /* stdout file number. */
49 #define STDOUT_FILE_NO 1
51 /* value of `pipe': port index for reading. */
54 /* value of `pipe': port index for writing. */
57 static char *install_error_msg
= "installation problem, cannot exec `%s'";
59 /* pexecute: execute a program.
61 PROGRAM and ARGV are the arguments to execv/execvp.
63 THIS_PNAME is name of the calling program (i.e. argv[0]).
65 TEMP_BASE is the path name, sans suffix, of a temporary file to use
66 if needed. This is currently only needed for MSDOS ports that don't use
67 GO32 (do any still exist?). Ports that don't need it can pass NULL.
69 (FLAGS & PEXECUTE_SEARCH) is non-zero if $PATH should be searched
70 (??? It's not clear that GCC passes this flag correctly).
71 (FLAGS & PEXECUTE_FIRST) is nonzero for the first process in chain.
72 (FLAGS & PEXECUTE_FIRST) is nonzero for the last process in chain.
73 FIRST_LAST could be simplified to only mark the last of a chain of processes
74 but that requires the caller to always mark the last one (and not give up
75 early if some error occurs). It's more robust to require the caller to
76 mark both ends of the chain.
78 The result is the pid on systems like Unix where we fork/exec and on systems
79 like WIN32 and OS2 where we use spawn. It is up to the caller to wait for
82 The result is the WEXITSTATUS on systems like MSDOS where we spawn and wait
85 Upon failure, ERRMSG_FMT and ERRMSG_ARG are set to the text of the error
86 message with an optional argument (if not needed, ERRMSG_ARG is set to
87 NULL), and -1 is returned. `errno' is available to the caller to use.
89 pwait: cover function for wait.
91 PID is the process id of the task to wait for.
92 STATUS is the `status' argument to wait.
93 FLAGS is currently unused (allows future enhancement without breaking
94 upward compatibility). Pass 0 for now.
96 The result is the pid of the child reaped,
97 or -1 for failure (errno says why).
99 On systems that don't support waiting for a particular child, PID is
100 ignored. On systems like MSDOS that don't really multitask pwait
101 is just a mechanism to provide a consistent interface for the caller.
103 pfinish: finish generation of script
105 pfinish is necessary for systems like MPW where a script is generated that
106 runs the requested programs.
111 /* MSDOS doesn't multitask, but for the sake of a consistent interface
112 the code behaves like it does. pexecute runs the program, tucks the
113 exit code away, and returns a "pid". pwait must be called to fetch the
118 /* For communicating information from pexecute to pwait. */
119 static int last_pid
= 0;
120 static int last_status
= 0;
121 static int last_reaped
= 0;
124 pexecute (program
, argv
, this_pname
, temp_base
, errmsg_fmt
, errmsg_arg
, flags
)
127 const char *this_pname
;
128 const char *temp_base
;
129 char **errmsg_fmt
, **errmsg_arg
;
138 if ((flags
& PEXECUTE_ONE
) != PEXECUTE_ONE
)
142 /* ??? What are the possible return values from spawnv? */
143 rc
= (flags
& PEXECUTE_SEARCH
? spawnvp
: spawnv
) (1, program
, argv
);
147 int i
, el
= flags
& PEXECUTE_SEARCH
? 4 : 0;
149 scmd
= (char *) xmalloc (strlen (program
) + strlen (temp_base
) + 6 + el
);
150 rf
= scmd
+ strlen(program
) + 2 + el
;
151 sprintf (scmd
, "%s%s @%s.gp", program
,
152 (flags
& PEXECUTE_SEARCH
? ".exe" : ""), temp_base
);
153 argfile
= fopen (rf
, "w");
156 int errno_save
= errno
;
159 *errmsg_fmt
= "cannot open `%s.gp'";
160 *errmsg_arg
= temp_base
;
164 for (i
=1; argv
[i
]; i
++)
167 for (cp
= argv
[i
]; *cp
; cp
++)
169 if (*cp
== '"' || *cp
== '\'' || *cp
== '\\' || isspace (*cp
))
170 fputc ('\\', argfile
);
171 fputc (*cp
, argfile
);
173 fputc ('\n', argfile
);
180 int errno_save
= errno
;
189 *errmsg_fmt
= install_error_msg
;
190 *errmsg_arg
= program
;
194 /* Tuck the status away for pwait, and return a "pid". */
195 last_status
= rc
<< 8;
200 pwait (pid
, status
, flags
)
205 /* On MSDOS each pexecute must be followed by it's associated pwait. */
207 /* Called twice for the same child? */
208 || pid
== last_reaped
)
210 /* ??? ECHILD would be a better choice. Can we use it here? */
214 /* ??? Here's an opportunity to canonicalize the values in STATUS.
216 *status
= last_status
;
217 last_reaped
= last_pid
;
227 extern int _spawnv ();
228 extern int _spawnvp ();
232 #define fix_argv(argvec) (argvec)
236 /* This is a kludge to get around the Microsoft C spawn functions' propensity
237 to remove the outermost set of double quotes from all arguments. */
245 for (i
= 1; argvec
[i
] != 0; i
++)
248 char *temp
, *newtemp
;
252 for (j
= 0; j
< len
; j
++)
256 newtemp
= (char *) xmalloc (len
+ 2);
257 strncpy (newtemp
, temp
, j
);
259 strncpy (&newtemp
[j
+1], &temp
[j
], len
-j
);
270 return (char * const *) argvec
;
273 #endif /* ! defined (__CYGWIN32__) */
276 pexecute (program
, argv
, this_pname
, temp_base
, errmsg_fmt
, errmsg_arg
, flags
)
279 const char *this_pname
;
280 const char *temp_base
;
282 const char **errmsg_arg
;
287 if ((flags
& PEXECUTE_ONE
) != PEXECUTE_ONE
)
289 pid
= (flags
& PEXECUTE_SEARCH
? _spawnvp
: _spawnv
)
290 (_P_NOWAIT
, program
, fix_argv (argv
));
293 *errmsg_fmt
= install_error_msg
;
294 *errmsg_arg
= program
;
301 pwait (pid
, status
, flags
)
308 pid
= cwait (&termstat
, pid
, WAIT_CHILD
);
310 /* ??? Here's an opportunity to canonicalize the values in STATUS.
313 /* cwait returns the child process exit code in termstat.
314 A value of 3 indicates that the child caught a signal, but not
315 which one. Since only SIGABRT, SIGFPE and SIGINT do anything, we
320 *status
= (((termstat
) & 0xff) << 8);
329 /* ??? Does OS2 have process.h? */
330 extern int spawnv ();
331 extern int spawnvp ();
334 pexecute (program
, argv
, this_pname
, temp_base
, errmsg_fmt
, errmsg_arg
, flags
)
337 const char *this_pname
;
338 const char *temp_base
;
339 char **errmsg_fmt
, **errmsg_arg
;
344 if ((flags
& PEXECUTE_ONE
) != PEXECUTE_ONE
)
346 /* ??? Presumably 1 == _P_NOWAIT. */
347 pid
= (flags
& PEXECUTE_SEARCH
? spawnvp
: spawnv
) (1, program
, argv
);
350 *errmsg_fmt
= install_error_msg
;
351 *errmsg_arg
= program
;
358 pwait (pid
, status
, flags
)
363 /* ??? Here's an opportunity to canonicalize the values in STATUS.
365 int pid
= wait (status
);
373 /* MPW pexecute doesn't actually run anything; instead, it writes out
374 script commands that, when run, will do the actual executing.
376 For example, in GCC's case, GCC will write out several script commands:
383 and then exit. None of the above programs will have run yet. The task
384 that called GCC will then execute the script and cause cpp,etc. to run.
385 The caller must invoke pfinish before calling exit. This adds
386 the finishing touches to the generated script. */
388 static int first_time
= 1;
391 pexecute (program
, argv
, this_pname
, temp_base
, errmsg_fmt
, errmsg_arg
, flags
)
394 const char *this_pname
;
395 const char *temp_base
;
396 char **errmsg_fmt
, **errmsg_arg
;
399 char tmpprogram
[255];
403 mpwify_filename (program
, tmpprogram
);
406 printf ("Set Failed 0\n");
410 fputs ("If {Failed} == 0\n", stdout
);
411 /* If being verbose, output a copy of the command. It should be
412 accurate enough and escaped enough to be "clickable". */
413 if (flags
& PEXECUTE_VERBOSE
)
415 fputs ("\tEcho ", stdout
);
416 fputc ('\'', stdout
);
417 fputs (tmpprogram
, stdout
);
418 fputc ('\'', stdout
);
420 for (i
=1; argv
[i
]; i
++)
422 fputc ('\'', stdout
);
423 /* See if we have an argument that needs fixing. */
424 if (strchr(argv
[i
], '/'))
426 tmpname
= (char *) xmalloc (256);
427 mpwify_filename (argv
[i
], tmpname
);
430 for (cp
= argv
[i
]; *cp
; cp
++)
432 /* Write an Option-d escape char in front of special chars. */
433 if (strchr("'+", *cp
))
434 fputc ('\266', stdout
);
437 fputc ('\'', stdout
);
440 fputs ("\n", stdout
);
442 fputs ("\t", stdout
);
443 fputs (tmpprogram
, stdout
);
446 for (i
=1; argv
[i
]; i
++)
448 /* See if we have an argument that needs fixing. */
449 if (strchr(argv
[i
], '/'))
451 tmpname
= (char *) xmalloc (256);
452 mpwify_filename (argv
[i
], tmpname
);
455 if (strchr (argv
[i
], ' '))
456 fputc ('\'', stdout
);
457 for (cp
= argv
[i
]; *cp
; cp
++)
459 /* Write an Option-d escape char in front of special chars. */
460 if (strchr("'+", *cp
))
461 fputc ('\266', stdout
);
464 if (strchr (argv
[i
], ' '))
465 fputc ('\'', stdout
);
469 fputs ("\n", stdout
);
471 /* Output commands that arrange to clean up and exit if a failure occurs.
472 We have to be careful to collect the status from the program that was
473 run, rather than some other script command. Also, we don't exit
474 immediately, since necessary cleanups are at the end of the script. */
475 fputs ("\tSet TmpStatus {Status}\n", stdout
);
476 fputs ("\tIf {TmpStatus} != 0\n", stdout
);
477 fputs ("\t\tSet Failed {TmpStatus}\n", stdout
);
478 fputs ("\tEnd\n", stdout
);
479 fputs ("End\n", stdout
);
481 /* We're just composing a script, can't fail here. */
486 pwait (pid
, status
, flags
)
495 /* Write out commands that will exit with the correct error code
496 if something in the script failed. */
501 printf ("\tExit \"{Failed}\"\n");
506 /* include for Unix-like environments but not for Dos-like environments */
507 #if ! defined (__MSDOS__) && ! defined (OS2) && ! defined (MPW) \
508 && ! defined (_WIN32)
511 #define vfork() (decc$$alloc_vfork_blocks() >= 0 ? \
512 lib$get_current_invo_context(decc$$get_vfork_jmpbuf()) : -1)
520 extern int execvp ();
523 pexecute (program
, argv
, this_pname
, temp_base
, errmsg_fmt
, errmsg_arg
, flags
)
526 const char *this_pname
;
527 const char *temp_base
;
528 char **errmsg_fmt
, **errmsg_arg
;
531 int (*func
)() = (flags
& PEXECUTE_SEARCH
? execvp
: execv
);
534 int input_desc
, output_desc
;
535 int retries
, sleep_interval
;
536 /* Pipe waiting from last process, to be used as input for the next one.
537 Value is STDIN_FILE_NO if no pipe is waiting
538 (i.e. the next command is the first of a group). */
539 static int last_pipe_input
;
541 /* If this is the first process, initialize. */
542 if (flags
& PEXECUTE_FIRST
)
543 last_pipe_input
= STDIN_FILE_NO
;
545 input_desc
= last_pipe_input
;
547 /* If this isn't the last process, make a pipe for its output,
548 and record it as waiting to be the input to the next process. */
549 if (! (flags
& PEXECUTE_LAST
))
553 *errmsg_fmt
= "pipe";
557 output_desc
= pdes
[WRITE_PORT
];
558 last_pipe_input
= pdes
[READ_PORT
];
563 output_desc
= STDOUT_FILE_NO
;
564 last_pipe_input
= STDIN_FILE_NO
;
567 /* Fork a subprocess; wait and retry if it fails. */
569 for (retries
= 0; retries
< 4; retries
++)
574 sleep (sleep_interval
);
583 *errmsg_fmt
= "fork";
585 *errmsg_fmt
= "vfork";
592 /* Move the input and output pipes into place, if necessary. */
593 if (input_desc
!= STDIN_FILE_NO
)
595 close (STDIN_FILE_NO
);
599 if (output_desc
!= STDOUT_FILE_NO
)
601 close (STDOUT_FILE_NO
);
606 /* Close the parent's descs that aren't wanted here. */
607 if (last_pipe_input
!= STDIN_FILE_NO
)
608 close (last_pipe_input
);
610 /* Exec the program. */
611 (*func
) (program
, argv
);
613 /* Note: Calling fprintf and exit here doesn't seem right for vfork. */
614 fprintf (stderr
, "%s: ", this_pname
);
615 fprintf (stderr
, install_error_msg
, program
);
617 fprintf (stderr
, ": %s\n", my_strerror (errno
));
619 fprintf (stderr
, ": %s\n", xstrerror (errno
));
626 /* In the parent, after forking.
627 Close the descriptors that we made for this child. */
628 if (input_desc
!= STDIN_FILE_NO
)
630 if (output_desc
!= STDOUT_FILE_NO
)
633 /* Return child's process number. */
639 pwait (pid
, status
, flags
)
644 /* ??? Here's an opportunity to canonicalize the values in STATUS.
647 pid
= waitpid (-1, status
, 0);
654 #endif /* ! __MSDOS__ && ! OS2 && ! MPW && ! _WIN32 */
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