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 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. */
31 #include "gansidecl.h"
32 /* ??? Need to find a suitable header file. */
33 #define PEXECUTE_FIRST 1
34 #define PEXECUTE_LAST 2
35 #define PEXECUTE_ONE (PEXECUTE_FIRST + PEXECUTE_LAST)
36 #define PEXECUTE_SEARCH 4
37 #define PEXECUTE_VERBOSE 8
39 #include "libiberty.h"
42 /* stdin file number. */
43 #define STDIN_FILE_NO 0
45 /* stdout file number. */
46 #define STDOUT_FILE_NO 1
48 /* value of `pipe': port index for reading. */
51 /* value of `pipe': port index for writing. */
54 static char *install_error_msg = "installation problem, cannot exec `%s'";
56 /* pexecute: execute a program.
58 PROGRAM and ARGV are the arguments to execv/execvp.
60 THIS_PNAME is name of the calling program (i.e. argv[0]).
62 TEMP_BASE is the path name, sans suffix, of a temporary file to use
63 if needed. This is currently only needed for MSDOS ports that don't use
64 GO32 (do any still exist?). Ports that don't need it can pass NULL.
66 (FLAGS & PEXECUTE_SEARCH) is non-zero if $PATH should be searched
67 (??? It's not clear that GCC passes this flag correctly).
68 (FLAGS & PEXECUTE_FIRST) is nonzero for the first process in chain.
69 (FLAGS & PEXECUTE_FIRST) is nonzero for the last process in chain.
70 FIRST_LAST could be simplified to only mark the last of a chain of processes
71 but that requires the caller to always mark the last one (and not give up
72 early if some error occurs). It's more robust to require the caller to
73 mark both ends of the chain.
75 The result is the pid on systems like Unix where we fork/exec and on systems
76 like WIN32 and OS2 where we use spawn. It is up to the caller to wait for
79 The result is the WEXITSTATUS on systems like MSDOS where we spawn and wait
82 Upon failure, ERRMSG_FMT and ERRMSG_ARG are set to the text of the error
83 message with an optional argument (if not needed, ERRMSG_ARG is set to
84 NULL), and -1 is returned. `errno' is available to the caller to use.
86 pwait: cover function for wait.
88 PID is the process id of the task to wait for.
89 STATUS is the `status' argument to wait.
90 FLAGS is currently unused (allows future enhancement without breaking
91 upward compatibility). Pass 0 for now.
93 The result is the pid of the child reaped,
94 or -1 for failure (errno says why).
96 On systems that don't support waiting for a particular child, PID is
97 ignored. On systems like MSDOS that don't really multitask pwait
98 is just a mechanism to provide a consistent interface for the caller.
100 pfinish: finish generation of script
102 pfinish is necessary for systems like MPW where a script is generated that
103 runs the requested programs.
108 /* MSDOS doesn't multitask, but for the sake of a consistent interface
109 the code behaves like it does. pexecute runs the program, tucks the
110 exit code away, and returns a "pid". pwait must be called to fetch the
115 /* For communicating information from pexecute to pwait. */
116 static int last_pid = 0;
117 static int last_status = 0;
118 static int last_reaped = 0;
121 pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
124 const char *this_pname;
125 const char *temp_base;
126 char **errmsg_fmt, **errmsg_arg;
135 if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
139 /* ??? What are the possible return values from spawnv? */
140 rc = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv);
144 int i, el = flags & PEXECUTE_SEARCH ? 4 : 0;
146 scmd = (char *) xmalloc (strlen (program) + strlen (temp_base) + 6 + el);
147 rf = scmd + strlen(program) + 2 + el;
148 sprintf (scmd, "%s%s @%s.gp", program,
149 (flags & PEXECUTE_SEARCH ? ".exe" : ""), temp_base);
150 argfile = fopen (rf, "w");
153 int errno_save = errno;
156 *errmsg_fmt = "cannot open `%s.gp'";
157 *errmsg_arg = temp_base;
161 for (i=1; argv[i]; i++)
164 for (cp = argv[i]; *cp; cp++)
166 if (*cp == '"' || *cp == '\'' || *cp == '\\' || isspace (*cp))
167 fputc ('\\', argfile);
168 fputc (*cp, argfile);
170 fputc ('\n', argfile);
177 int errno_save = errno;
186 *errmsg_fmt = install_error_msg;
187 *errmsg_arg = program;
191 /* Tuck the status away for pwait, and return a "pid". */
192 last_status = rc << 8;
197 pwait (pid, status, flags)
202 /* On MSDOS each pexecute must be followed by it's associated pwait. */
204 /* Called twice for the same child? */
205 || pid == last_reaped)
207 /* ??? ECHILD would be a better choice. Can we use it here? */
211 /* ??? Here's an opportunity to canonicalize the values in STATUS.
213 *status = last_status;
214 last_reaped = last_pid;
220 #if defined (_WIN32) && !defined (__CYGWIN32__)
223 /* ??? Why are these __spawnv{,p} and not _spawnv{,p}? */
224 extern int __spawnv ();
225 extern int __spawnvp ();
228 pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
231 const char *this_pname;
232 const char *temp_base;
233 char **errmsg_fmt, **errmsg_arg;
238 if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
240 pid = (flags & PEXECUTE_SEARCH ? __spawnvp : __spawnv) (_P_NOWAIT, program, argv);
243 *errmsg_fmt = install_error_msg;
244 *errmsg_arg = program;
251 pwait (pid, status, flags)
256 /* ??? Here's an opportunity to canonicalize the values in STATUS.
258 int pid = cwait (status, pid, WAIT_CHILD);
266 /* ??? Does OS2 have process.h? */
267 extern int spawnv ();
268 extern int spawnvp ();
271 pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
274 const char *this_pname;
275 const char *temp_base;
276 char **errmsg_fmt, **errmsg_arg;
281 if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
283 /* ??? Presumably 1 == _P_NOWAIT. */
284 pid = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv);
287 *errmsg_fmt = install_error_msg;
288 *errmsg_arg = program;
295 pwait (pid, status, flags)
300 /* ??? Here's an opportunity to canonicalize the values in STATUS.
302 int pid = wait (status);
310 /* MPW pexecute doesn't actually run anything; instead, it writes out
311 script commands that, when run, will do the actual executing.
313 For example, in GCC's case, GCC will write out several script commands:
320 and then exit. None of the above programs will have run yet. The task
321 that called GCC will then execute the script and cause cpp,etc. to run.
322 The caller must invoke pfinish before calling exit. This adds
323 the finishing touches to the generated script. */
325 static int first_time = 1;
328 pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
331 const char *this_pname;
332 const char *temp_base;
333 char **errmsg_fmt, **errmsg_arg;
336 char tmpprogram[255];
340 mpwify_filename (program, tmpprogram);
343 printf ("Set Failed 0\n");
347 fputs ("If {Failed} == 0\n", stdout);
348 /* If being verbose, output a copy of the command. It should be
349 accurate enough and escaped enough to be "clickable". */
350 if (flags & PEXECUTE_VERBOSE)
352 fputs ("\tEcho ", stdout);
353 fputc ('\'', stdout);
354 fputs (tmpprogram, stdout);
355 fputc ('\'', stdout);
357 for (i=1; argv[i]; i++)
359 fputc ('\'', stdout);
360 /* See if we have an argument that needs fixing. */
361 if (strchr(argv[i], '/'))
363 tmpname = xmalloc (256);
364 mpwify_filename (argv[i], tmpname);
367 for (cp = argv[i]; *cp; cp++)
369 /* Write an Option-d escape char in front of special chars. */
370 if (strchr("'+", *cp))
371 fputc ('\266', stdout);
374 fputc ('\'', stdout);
377 fputs ("\n", stdout);
379 fputs ("\t", stdout);
380 fputs (tmpprogram, stdout);
383 for (i=1; argv[i]; i++)
385 /* See if we have an argument that needs fixing. */
386 if (strchr(argv[i], '/'))
388 tmpname = xmalloc (256);
389 mpwify_filename (argv[i], tmpname);
392 if (strchr (argv[i], ' '))
393 fputc ('\'', stdout);
394 for (cp = argv[i]; *cp; cp++)
396 /* Write an Option-d escape char in front of special chars. */
397 if (strchr("'+", *cp))
398 fputc ('\266', stdout);
401 if (strchr (argv[i], ' '))
402 fputc ('\'', stdout);
406 fputs ("\n", stdout);
408 /* Output commands that arrange to clean up and exit if a failure occurs.
409 We have to be careful to collect the status from the program that was
410 run, rather than some other script command. Also, we don't exit
411 immediately, since necessary cleanups are at the end of the script. */
412 fputs ("\tSet TmpStatus {Status}\n", stdout);
413 fputs ("\tIf {TmpStatus} != 0\n", stdout);
414 fputs ("\t\tSet Failed {TmpStatus}\n", stdout);
415 fputs ("\tEnd\n", stdout);
416 fputs ("End\n", stdout);
418 /* We're just composing a script, can't fail here. */
423 pwait (pid, status, flags)
432 /* Write out commands that will exit with the correct error code
433 if something in the script failed. */
438 printf ("\tExit \"{Failed}\"\n");
443 /* include for Unix-like environments but not for Dos-like environments */
444 #if ! defined (__MSDOS__) && ! defined (OS2) && ! defined (MPW) \
445 && (defined (__CYGWIN32__) || ! defined (_WIN32))
448 #define vfork() (decc$$alloc_vfork_blocks() >= 0 ? \
449 lib$get_current_invo_context(decc$$get_vfork_jmpbuf()) : -1)
457 extern int execvp ();
460 pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
463 const char *this_pname;
464 const char *temp_base;
465 char **errmsg_fmt, **errmsg_arg;
468 int (*func)() = (flags & PEXECUTE_SEARCH ? execvp : execv);
471 int input_desc, output_desc;
472 int retries, sleep_interval;
473 /* Pipe waiting from last process, to be used as input for the next one.
474 Value is STDIN_FILE_NO if no pipe is waiting
475 (i.e. the next command is the first of a group). */
476 static int last_pipe_input;
478 /* If this is the first process, initialize. */
479 if (flags & PEXECUTE_FIRST)
480 last_pipe_input = STDIN_FILE_NO;
482 input_desc = last_pipe_input;
484 /* If this isn't the last process, make a pipe for its output,
485 and record it as waiting to be the input to the next process. */
486 if (! (flags & PEXECUTE_LAST))
490 *errmsg_fmt = "pipe";
494 output_desc = pdes[WRITE_PORT];
495 last_pipe_input = pdes[READ_PORT];
500 output_desc = STDOUT_FILE_NO;
501 last_pipe_input = STDIN_FILE_NO;
504 /* Fork a subprocess; wait and retry if it fails. */
506 for (retries = 0; retries < 4; retries++)
511 sleep (sleep_interval);
520 *errmsg_fmt = "fork";
522 *errmsg_fmt = "vfork";
529 /* Move the input and output pipes into place, if necessary. */
530 if (input_desc != STDIN_FILE_NO)
532 close (STDIN_FILE_NO);
536 if (output_desc != STDOUT_FILE_NO)
538 close (STDOUT_FILE_NO);
543 /* Close the parent's descs that aren't wanted here. */
544 if (last_pipe_input != STDIN_FILE_NO)
545 close (last_pipe_input);
547 /* Exec the program. */
548 (*func) (program, argv);
550 /* Note: Calling fprintf and exit here doesn't seem right for vfork. */
551 fprintf (stderr, "%s: ", this_pname);
552 fprintf (stderr, install_error_msg, program);
554 fprintf (stderr, ": %s\n", my_strerror (errno));
556 fprintf (stderr, ": %s\n", xstrerror (errno));
563 /* In the parent, after forking.
564 Close the descriptors that we made for this child. */
565 if (input_desc != STDIN_FILE_NO)
567 if (output_desc != STDOUT_FILE_NO)
570 /* Return child's process number. */
576 pwait (pid, status, flags)
581 /* ??? Here's an opportunity to canonicalize the values in STATUS.
584 pid = waitpid (-1, status, 0);
591 #endif /* ! __MSDOS__ && ! OS2 && ! MPW && (__CYGWIN32___ || ! _WIN32) */