--- /dev/null
+/* Utilities to execute a program in a subprocess (possibly linked by pipes
+ with other subprocesses), and wait for it.
+ Copyright (C) 1996 Free Software Foundation, Inc.
+
+This file is part of the libiberty library.
+Libiberty is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+Libiberty is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+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. */
+
+/* This file exports two functions: pexecute and pwait. */
+
+/* This file lives in at least two places: libiberty and gcc.
+ Don't change one without the other. */
+
+/* ??? The usage of execv/spawnv vs execvp/spawnvp seems backwards. */
+
+#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
+#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.
+*/
+
+#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. */
+
+#include <process.h>
+
+/* For communicating information from pexecute to pwait. */
+static int last_pid = 0;
+static int last_status = 0;
+static int last_reaped = 0;
+
+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 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;
+
+ 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)
+ {
+ 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 (*cp == '"' || *cp == '\'' || *cp == '\\' || isspace (*cp))
+ fputc ('\\', argfile);
+ fputc (*cp, argfile);
+ }
+ fputc ('\n', argfile);
+ }
+ 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 */
+
+#ifdef _WIN32
+
+#include <process.h>
+/* ??? Why are these __spawnv{,p} and not _spawnv{,p}? */
+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)
+ {
+ *errmsg_fmt = install_error_msg;
+ *errmsg_arg = program;
+ 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 = cwait (status, pid, WAIT_CHILD);
+ return pid;
+}
+
+#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_fmt = install_error_msg;
+ *errmsg_arg = program;
+ 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;
+}
+
+#endif /* OS2 */
+
+#if ! defined (__MSDOS__) && ! defined (_WIN32) && ! defined (OS2)
+
+#ifdef USG
+#define vfork fork
+#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)
+ {
+ *errmsg_fmt = "pipe";
+ *errmsg_arg = NULL;
+ 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;
+ }
+
+ /* Fork a subprocess; wait and retry if it fails. */
+ sleep_interval = 1;
+ for (retries = 0; retries < 4; retries++)
+ {
+ pid = vfork ();
+ if (pid >= 0)
+ break;
+ sleep (sleep_interval);
+ sleep_interval *= 2;
+ }
+
+ 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? */
+ pid = wait (status);
+ return pid;
+}
+
+#endif /* !MSDOS && !WIN32 && !OS2 */
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