/* Utilities to execute a program in a subprocess (possibly linked by pipes
with other subprocesses), and wait for it.
- Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+ Copyright (C) 2004 Free Software Foundation, Inc.
This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB. If not,
-write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
+Boston, MA 02110-1301, USA. */
-/* This file exports two functions: pexecute and pwait. */
+/* pexecute is an old routine. This implementation uses the newer
+ pex_init/pex_run/pex_get_status/pex_free routines. Don't use
+ pexecute in new code. Use the newer routines instead. */
-/* This file lives in at least two places: libiberty and gcc.
- Don't change one without the other. */
-
-#include <stdio.h>
-#include <errno.h>
-
-#ifdef IN_GCC
#include "config.h"
-#include "gansidecl.h"
-/* ??? Need to find a suitable header file. */
-#define PEXECUTE_FIRST 1
-#define PEXECUTE_LAST 2
-#define PEXECUTE_ONE (PEXECUTE_FIRST + PEXECUTE_LAST)
-#define PEXECUTE_SEARCH 4
-#define PEXECUTE_VERBOSE 8
-#else
#include "libiberty.h"
-#endif
-
-/* stdin file number. */
-#define STDIN_FILE_NO 0
-
-/* stdout file number. */
-#define STDOUT_FILE_NO 1
-
-/* value of `pipe': port index for reading. */
-#define READ_PORT 0
-
-/* value of `pipe': port index for writing. */
-#define WRITE_PORT 1
-
-static char *install_error_msg = "installation problem, cannot exec `%s'";
-
-/* pexecute: execute a program.
-
- PROGRAM and ARGV are the arguments to execv/execvp.
-
- THIS_PNAME is name of the calling program (i.e. argv[0]).
-
- TEMP_BASE is the path name, sans suffix, of a temporary file to use
- if needed. This is currently only needed for MSDOS ports that don't use
- GO32 (do any still exist?). Ports that don't need it can pass NULL.
-
- (FLAGS & PEXECUTE_SEARCH) is non-zero if $PATH should be searched
- (??? It's not clear that GCC passes this flag correctly).
- (FLAGS & PEXECUTE_FIRST) is nonzero for the first process in chain.
- (FLAGS & PEXECUTE_FIRST) is nonzero for the last process in chain.
- FIRST_LAST could be simplified to only mark the last of a chain of processes
- but that requires the caller to always mark the last one (and not give up
- early if some error occurs). It's more robust to require the caller to
- mark both ends of the chain.
-
- The result is the pid on systems like Unix where we fork/exec and on systems
- like WIN32 and OS2 where we use spawn. It is up to the caller to wait for
- the child.
-
- The result is the WEXITSTATUS on systems like MSDOS where we spawn and wait
- for the child here.
-
- Upon failure, ERRMSG_FMT and ERRMSG_ARG are set to the text of the error
- message with an optional argument (if not needed, ERRMSG_ARG is set to
- NULL), and -1 is returned. `errno' is available to the caller to use.
-
- pwait: cover function for wait.
-
- PID is the process id of the task to wait for.
- STATUS is the `status' argument to wait.
- FLAGS is currently unused (allows future enhancement without breaking
- upward compatibility). Pass 0 for now.
- The result is the pid of the child reaped,
- or -1 for failure (errno says why).
-
- On systems that don't support waiting for a particular child, PID is
- ignored. On systems like MSDOS that don't really multitask pwait
- is just a mechanism to provide a consistent interface for the caller.
-
- pfinish: finish generation of script
-
- pfinish is necessary for systems like MPW where a script is generated that
- runs the requested programs.
-*/
-
-#ifdef __MSDOS__
-
-/* MSDOS doesn't multitask, but for the sake of a consistent interface
- the code behaves like it does. pexecute runs the program, tucks the
- exit code away, and returns a "pid". pwait must be called to fetch the
- exit code. */
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
-#include <process.h>
+/* We only permit a single pexecute chain to execute at a time. This
+ was always true anyhow, though it wasn't documented. */
-/* For communicating information from pexecute to pwait. */
-static int last_pid = 0;
-static int last_status = 0;
-static int last_reaped = 0;
+static struct pex_obj *pex;
+static int idx;
int
-pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
- const char *program;
- char * const *argv;
- const char *this_pname;
- const char *temp_base;
- char **errmsg_fmt, **errmsg_arg;
- int flags;
+pexecute (const char *program, char * const *argv, const char *pname,
+ const char *temp_base, char **errmsg_fmt, char **errmsg_arg,
+ int flags)
{
- int rc;
-
- last_pid++;
- if (last_pid < 0)
- last_pid = 1;
-
- if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
- abort ();
-
-#ifdef __GO32__
- /* ??? What are the possible return values from spawnv? */
- rc = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv);
-#else
- char *scmd, *rf;
- FILE *argfile;
- int i, el = flags & PEXECUTE_SEARCH ? 4 : 0;
+ const char *errmsg;
+ int err;
- scmd = (char *) xmalloc (strlen (program) + strlen (temp_base) + 6 + el);
- rf = scmd + strlen(program) + 2 + el;
- sprintf (scmd, "%s%s @%s.gp", program,
- (flags & PEXECUTE_SEARCH ? ".exe" : ""), temp_base);
- argfile = fopen (rf, "w");
- if (argfile == 0)
+ if ((flags & PEXECUTE_FIRST) != 0)
{
- int errno_save = errno;
- free (scmd);
- errno = errno_save;
- *errmsg_fmt = "cannot open `%s.gp'";
- *errmsg_arg = temp_base;
- return -1;
- }
-
- for (i=1; argv[i]; i++)
- {
- char *cp;
- for (cp = argv[i]; *cp; cp++)
+ if (pex != NULL)
{
- if (*cp == '"' || *cp == '\'' || *cp == '\\' || isspace (*cp))
- fputc ('\\', argfile);
- fputc (*cp, argfile);
+ *errmsg_fmt = (char *) "pexecute already in progress";
+ *errmsg_arg = NULL;
+ return -1;
}
- fputc ('\n', argfile);
+ pex = pex_init (PEX_USE_PIPES, pname, temp_base);
+ idx = 0;
}
- fclose (argfile);
-
- rc = system (scmd);
-
- {
- int errno_save = errno;
- remove (rf);
- free (scmd);
- errno = errno_save;
- }
-#endif
-
- if (rc == -1)
- {
- *errmsg_fmt = install_error_msg;
- *errmsg_arg = program;
- return -1;
- }
-
- /* Tuck the status away for pwait, and return a "pid". */
- last_status = rc << 8;
- return last_pid;
-}
-
-int
-pwait (pid, status, flags)
- int pid;
- int *status;
- int flags;
-{
- /* On MSDOS each pexecute must be followed by it's associated pwait. */
- if (pid != last_pid
- /* Called twice for the same child? */
- || pid == last_reaped)
- {
- /* ??? ECHILD would be a better choice. Can we use it here? */
- errno = EINVAL;
- return -1;
- }
- /* ??? Here's an opportunity to canonicalize the values in STATUS.
- Needed? */
- *status = last_status;
- last_reaped = last_pid;
- return last_pid;
-}
-
-#endif /* MSDOS */
-
-#if defined (_WIN32)
-
-#include <process.h>
-extern int _spawnv ();
-extern int _spawnvp ();
-
-int
-pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
- const char *program;
- char * const *argv;
- const char *this_pname;
- const char *temp_base;
- char **errmsg_fmt, **errmsg_arg;
- int flags;
-{
- int pid;
-
- if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
- abort ();
- pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv) (_P_NOWAIT, program, argv);
- if (pid == -1)
+ else
{
- *errmsg_fmt = install_error_msg;
- *errmsg_arg = program;
- return -1;
+ if (pex == NULL)
+ {
+ *errmsg_fmt = (char *) "pexecute not in progress";
+ *errmsg_arg = NULL;
+ return -1;
+ }
}
- return pid;
-}
-
-int
-pwait (pid, status, flags)
- int pid;
- int *status;
- int flags;
-{
- /* ??? Here's an opportunity to canonicalize the values in STATUS.
- Needed? */
- return cwait (status, pid, WAIT_CHILD);
-}
-
-#endif /* _WIN32 */
-
-#ifdef OS2
-
-/* ??? Does OS2 have process.h? */
-extern int spawnv ();
-extern int spawnvp ();
-
-int
-pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
- const char *program;
- char * const *argv;
- const char *this_pname;
- const char *temp_base;
- char **errmsg_fmt, **errmsg_arg;
- int flags;
-{
- int pid;
- if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
- abort ();
- /* ??? Presumably 1 == _P_NOWAIT. */
- pid = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv);
- if (pid == -1)
+ errmsg = pex_run (pex,
+ (((flags & PEXECUTE_LAST) != 0 ? PEX_LAST : 0)
+ | ((flags & PEXECUTE_SEARCH) != 0 ? PEX_SEARCH : 0)),
+ program, argv, NULL, NULL, &err);
+ if (errmsg != NULL)
{
- *errmsg_fmt = install_error_msg;
- *errmsg_arg = program;
+ *errmsg_fmt = (char *) errmsg;
+ *errmsg_arg = NULL;
return -1;
}
- return pid;
-}
-int
-pwait (pid, status, flags)
- int pid;
- int *status;
- int flags;
-{
- /* ??? Here's an opportunity to canonicalize the values in STATUS.
- Needed? */
- int pid = wait (status);
- return pid;
+ /* Instead of a PID, we just return a one-based index into the
+ status values. We avoid zero just because the old pexecute would
+ never return it. */
+ return ++idx;
}
-#endif /* OS2 */
-
-#ifdef MPW
-
-/* MPW pexecute doesn't actually run anything; instead, it writes out
- script commands that, when run, will do the actual executing.
-
- For example, in GCC's case, GCC will write out several script commands:
-
- cpp ...
- cc1 ...
- as ...
- ld ...
-
- and then exit. None of the above programs will have run yet. The task
- that called GCC will then execute the script and cause cpp,etc. to run.
- The caller must invoke pfinish before calling exit. This adds
- the finishing touches to the generated script. */
-
-static int first_time = 1;
-
int
-pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
- const char *program;
- char **argv;
- const char *this_pname;
- const char *temp_base;
- char **errmsg_fmt, **errmsg_arg;
- int flags;
+pwait (int pid, int *status, int flags ATTRIBUTE_UNUSED)
{
- char tmpprogram[255];
- char *cp, *tmpname;
- int i;
+ /* The PID returned by pexecute is one-based. */
+ --pid;
- mpwify_filename (program, tmpprogram);
- if (first_time)
- {
- printf ("Set Failed 0\n");
- first_time = 0;
- }
+ if (pex == NULL || pid < 0 || pid >= idx)
+ return -1;
- fputs ("If {Failed} == 0\n", stdout);
- /* If being verbose, output a copy of the command. It should be
- accurate enough and escaped enough to be "clickable". */
- if (flags & PEXECUTE_VERBOSE)
+ if (pid == 0 && idx == 1)
{
- fputs ("\tEcho ", stdout);
- fputc ('\'', stdout);
- fputs (tmpprogram, stdout);
- fputc ('\'', stdout);
- fputc (' ', stdout);
- for (i=1; argv[i]; i++)
- {
- /* We have to quote every arg, so that when the echo is
- executed, the quotes are stripped and the original arg
- is left. */
- fputc ('\'', stdout);
- for (cp = argv[i]; *cp; cp++)
- {
- /* Write an Option-d esc char in front of special chars. */
- if (strchr ("\"'+", *cp))
- fputc ('\266', stdout);
- fputc (*cp, stdout);
- }
- fputc ('\'', stdout);
- fputc (' ', stdout);
- }
- fputs ("\n", stdout);
+ if (!pex_get_status (pex, 1, status))
+ return -1;
}
- fputs ("\t", stdout);
- fputs (tmpprogram, stdout);
- fputc (' ', stdout);
-
- for (i=1; argv[i]; i++)
+ else
{
- if (strchr (argv[i], ' '))
- fputc ('\'', stdout);
- for (cp = argv[i]; *cp; cp++)
- {
- /* Write an Option-d esc char in front of special chars. */
- if (strchr ("\"'+", *cp))
- {
- fputc ('\266', stdout);
- }
- fputc (*cp, stdout);
- }
- if (strchr (argv[i], ' '))
- fputc ('\'', stdout);
- fputc (' ', stdout);
- }
-
- fputs ("\n", stdout);
-
- /* Output commands that arrange to clean up and exit if a failure occurs.
- We have to be careful to collect the status from the program that was
- run, rather than some other script command. Also, we don't exit
- immediately, since necessary cleanups are at the end of the script. */
- fputs ("\tSet TmpStatus {Status}\n", stdout);
- fputs ("\tIf {TmpStatus} != 0\n", stdout);
- fputs ("\t\tSet Failed {TmpStatus}\n", stdout);
- fputs ("\tEnd\n", stdout);
- fputs ("End\n", stdout);
-
- /* We're just composing a script, can't fail here. */
- return 0;
-}
-
-int
-pwait (pid, status, flags)
- int pid;
- int *status;
- int flags;
-{
- *status = 0;
- return 0;
-}
-
-/* Write out commands that will exit with the correct error code
- if something in the script failed. */
-
-void
-pfinish ()
-{
- printf ("\tExit \"{Failed}\"\n");
-}
-
-#endif /* MPW */
-
-/* include for Unix-like environments but not for Dos-like environments */
-#if ! defined (__MSDOS__) && ! defined (OS2) && ! defined (MPW) \
- && ! defined (_WIN32)
+ int *vector;
-#ifdef VMS
-#define vfork() (decc$$alloc_vfork_blocks() >= 0 ? \
- lib$get_current_invo_context(decc$$get_vfork_jmpbuf()) : -1)
-#else
-#ifdef USG
-#define vfork fork
-#endif
-#endif
-
-extern int execv ();
-extern int execvp ();
-
-int
-pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
- const char *program;
- char * const *argv;
- const char *this_pname;
- const char *temp_base;
- char **errmsg_fmt, **errmsg_arg;
- int flags;
-{
- int (*func)() = (flags & PEXECUTE_SEARCH ? execvp : execv);
- int pid;
- int pdes[2];
- int input_desc, output_desc;
- int retries, sleep_interval;
- /* Pipe waiting from last process, to be used as input for the next one.
- Value is STDIN_FILE_NO if no pipe is waiting
- (i.e. the next command is the first of a group). */
- static int last_pipe_input;
-
- /* If this is the first process, initialize. */
- if (flags & PEXECUTE_FIRST)
- last_pipe_input = STDIN_FILE_NO;
-
- input_desc = last_pipe_input;
-
- /* If this isn't the last process, make a pipe for its output,
- and record it as waiting to be the input to the next process. */
- if (! (flags & PEXECUTE_LAST))
- {
- if (pipe (pdes) < 0)
+ vector = XNEWVEC (int, idx);
+ if (!pex_get_status (pex, idx, vector))
{
- *errmsg_fmt = "pipe";
- *errmsg_arg = NULL;
+ free (vector);
return -1;
}
- output_desc = pdes[WRITE_PORT];
- last_pipe_input = pdes[READ_PORT];
- }
- else
- {
- /* Last process. */
- output_desc = STDOUT_FILE_NO;
- last_pipe_input = STDIN_FILE_NO;
+ *status = vector[pid];
+ free (vector);
}
- /* Fork a subprocess; wait and retry if it fails. */
- sleep_interval = 1;
- for (retries = 0; retries < 4; retries++)
+ /* Assume that we are done after the caller has retrieved the last
+ exit status. The original implementation did not require that
+ the exit statuses be retrieved in order, but this implementation
+ does. */
+ if (pid + 1 == idx)
{
- pid = vfork ();
- if (pid >= 0)
- break;
- sleep (sleep_interval);
- sleep_interval *= 2;
+ pex_free (pex);
+ pex = NULL;
+ idx = 0;
}
- switch (pid)
- {
- case -1:
- {
-#ifdef vfork
- *errmsg_fmt = "fork";
-#else
- *errmsg_fmt = "vfork";
-#endif
- *errmsg_arg = NULL;
- return -1;
- }
-
- case 0: /* child */
- /* Move the input and output pipes into place, if necessary. */
- if (input_desc != STDIN_FILE_NO)
- {
- close (STDIN_FILE_NO);
- dup (input_desc);
- close (input_desc);
- }
- if (output_desc != STDOUT_FILE_NO)
- {
- close (STDOUT_FILE_NO);
- dup (output_desc);
- close (output_desc);
- }
-
- /* Close the parent's descs that aren't wanted here. */
- if (last_pipe_input != STDIN_FILE_NO)
- close (last_pipe_input);
-
- /* Exec the program. */
- (*func) (program, argv);
-
- /* Note: Calling fprintf and exit here doesn't seem right for vfork. */
- fprintf (stderr, "%s: ", this_pname);
- fprintf (stderr, install_error_msg, program);
-#ifdef IN_GCC
- fprintf (stderr, ": %s\n", my_strerror (errno));
-#else
- fprintf (stderr, ": %s\n", xstrerror (errno));
-#endif
- exit (-1);
- /* NOTREACHED */
- return 0;
-
- default:
- /* In the parent, after forking.
- Close the descriptors that we made for this child. */
- if (input_desc != STDIN_FILE_NO)
- close (input_desc);
- if (output_desc != STDOUT_FILE_NO)
- close (output_desc);
-
- /* Return child's process number. */
- return pid;
- }
-}
-
-int
-pwait (pid, status, flags)
- int pid;
- int *status;
- int flags;
-{
- /* ??? Here's an opportunity to canonicalize the values in STATUS.
- Needed? */
-#ifdef VMS
- pid = waitpid (-1, status, 0);
-#else
- pid = wait (status);
-#endif
- return pid;
+ return pid + 1;
}
-
-#endif /* ! __MSDOS__ && ! OS2 && ! MPW && ! _WIN32 */
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