#include <stdio.h>
#include <errno.h>
+#ifdef NEED_DECLARATION_ERRNO
+extern int errno;
+#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
-#define ISSPACE (x) isspace(x)
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
-#ifdef vfork /* Autoconf may define this to fork for us. */
-# define VFORK_STRING "fork"
-#else
-# define VFORK_STRING "vfork"
-#endif
-#ifdef HAVE_VFORK_H
-#include <vfork.h>
-#endif
-#ifdef VMS
-#define vfork() (decc$$alloc_vfork_blocks() >= 0 ? \
- lib$get_current_invo_context(decc$$get_vfork_jmpbuf()) : -1)
-#endif /* VMS */
-
#include "libiberty.h"
+#include "safe-ctype.h"
/* stdin file number. */
#define STDIN_FILE_NO 0
/* pexecute: execute a program.
- PROGRAM and ARGV are the arguments to execv/execvp.
+@deftypefn Extension int pexecute (const char *@var{program}, char * const *@var{argv}, const char *@var{this_pname}, const char *@var{temp_base}, char **@var{errmsg_fmt}, char **@var{errmsg_arg}, int flags)
+
+Executes a program.
+
+@var{program} and @var{argv} are the arguments to
+@code{execv}/@code{execvp}.
+
+@var{this_pname} is name of the calling program (i.e., @code{argv[0]}).
+
+@var{temp_base} is the path name, sans suffix, of a temporary file to
+use if needed. This is currently only needed for MS-DOS ports that
+don't use @code{go32} (do any still exist?). Ports that don't need it
+can pass @code{NULL}.
- THIS_PNAME is name of the calling program (i.e. argv[0]).
+(@code{@var{flags} & PEXECUTE_SEARCH}) is non-zero if @env{PATH} should be searched
+(??? It's not clear that GCC passes this flag correctly). (@code{@var{flags} &
+PEXECUTE_FIRST}) is nonzero for the first process in chain.
+(@code{@var{flags} & PEXECUTE_FIRST}) is nonzero for the last process
+in chain. The first/last flags 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.
- 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.
+The result is the pid on systems like Unix where we
+@code{fork}/@code{exec} and on systems like WIN32 and OS/2 where we
+use @code{spawn}. It is up to the caller to wait for the child.
- (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 @code{WEXITSTATUS} on systems like MS-DOS where we
+@code{spawn} and wait for the child here.
- 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.
+Upon failure, @var{errmsg_fmt} and @var{errmsg_arg} are set to the
+text of the error message with an optional argument (if not needed,
+@var{errmsg_arg} is set to @code{NULL}), and @minus{}1 is returned.
+@code{errno} is available to the caller to use.
- The result is the WEXITSTATUS on systems like MSDOS where we spawn and wait
- for the child here.
+@end deftypefn
- 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.
+@deftypefn Extension int pwait (int @var{pid}, int *@var{status}, int @var{flags})
- pwait: cover function for wait.
+Waits for a program started by @code{pexecute} to finish.
- 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.
+@var{pid} is the process id of the task to wait for. @var{status} is
+the `status' argument to wait. @var{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).
+The result is the pid of the child reaped, or -1 for failure
+(@code{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.
+On systems that don't support waiting for a particular child, @var{pid} is
+ignored. On systems like MS-DOS that don't really multitask @code{pwait}
+is just a mechanism to provide a consistent interface for the caller.
+
+@end deftypefn
+
+@undocumented pfinish
pfinish: finish generation of script
pfinish is necessary for systems like MPW where a script is generated that
- runs the requested programs.
-*/
+ runs the requested programs. */
#ifdef __MSDOS__
if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
abort ();
-#ifdef __GO32__
+#ifdef __DJGPP__
/* ??? What are the possible return values from spawnv? */
- rc = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv);
+ rc = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (P_WAIT, program, argv);
#else
char *scmd, *rf;
FILE *argfile;
if (rc == -1)
{
*errmsg_fmt = install_error_msg;
- *errmsg_arg = program;
+ *errmsg_arg = (char *)program;
return -1;
}
return last_pid;
}
+/* Use ECHILD if available, otherwise use EINVAL. */
+#ifdef ECHILD
+#define PWAIT_ERROR ECHILD
+#else
+#define PWAIT_ERROR EINVAL
+#endif
+
int
pwait (pid, status, flags)
int pid;
/* Called twice for the same child? */
|| pid == last_reaped)
{
- /* ??? ECHILD would be a better choice. Can we use it here? */
- errno = EINVAL;
+ errno = PWAIT_ERROR;
return -1;
}
/* ??? Here's an opportunity to canonicalize the values in STATUS.
Needed? */
+#ifdef __DJGPP__
+ *status = (last_status >> 8);
+#else
*status = last_status;
+#endif
last_reaped = last_pid;
return last_pid;
}
/* This is a kludge to get around the Microsoft C spawn functions' propensity
to remove the outermost set of double quotes from all arguments. */
-const char * const *
+static const char * const *
fix_argv (argvec)
char **argvec;
{
/* Fork a subprocess; wait and retry if it fails. */
sleep_interval = 1;
+ pid = -1;
for (retries = 0; retries < 4; retries++)
{
- pid = vfork ();
+ pid = fork ();
if (pid >= 0)
break;
sleep (sleep_interval);
switch (pid)
{
case -1:
- {
- *errmsg_fmt = VFORK_STRING;
- *errmsg_arg = NULL;
- return -1;
- }
+ *errmsg_fmt = "fork";
+ *errmsg_arg = NULL;
+ return -1;
case 0: /* child */
/* Move the input and output pipes into place, if necessary. */
/* 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);
fprintf (stderr, ": %s\n", xstrerror (errno));
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