/* Utilities to execute a program in a subprocess (possibly linked by pipes
with other subprocesses), and wait for it. Generic Unix version
(also used for UWIN and VMS).
- Copyright (C) 1996-2022 Free Software Foundation, Inc.
+ Copyright (C) 1996-2024 Free Software Foundation, Inc.
This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
#ifdef HAVE_PROCESS_H
#include <process.h>
#endif
+#ifdef HAVE_SPAWN_H
+#include <spawn.h>
+#endif
#ifdef vfork /* Autoconf may define this to fork for us. */
# define VFORK_STRING "fork"
int, int, int, int,
const char **, int *);
static int pex_unix_close (struct pex_obj *, int);
-static int pex_unix_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
- int, const char **, int *);
+static pid_t pex_unix_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
+ int, const char **, int *);
static int pex_unix_pipe (struct pex_obj *, int *, int);
static FILE *pex_unix_fdopenr (struct pex_obj *, int, int);
static FILE *pex_unix_fdopenw (struct pex_obj *, int, int);
return (pid_t) -1;
}
+#elif defined(HAVE_POSIX_SPAWN) && defined(HAVE_POSIX_SPAWNP)
+/* Implementation of pex->exec_child using posix_spawn. */
+
+static pid_t
+pex_unix_exec_child (struct pex_obj *obj ATTRIBUTE_UNUSED,
+ int flags, const char *executable,
+ char * const * argv, char * const * env,
+ int in, int out, int errdes,
+ int toclose, const char **errmsg, int *err)
+{
+ int ret;
+ pid_t pid = -1;
+ posix_spawnattr_t attr;
+ posix_spawn_file_actions_t actions;
+ int attr_initialized = 0, actions_initialized = 0;
+
+ *err = 0;
+
+ ret = posix_spawnattr_init (&attr);
+ if (ret)
+ {
+ *err = ret;
+ *errmsg = "posix_spawnattr_init";
+ goto exit;
+ }
+ attr_initialized = 1;
+
+ /* Use vfork() on glibc <=2.24. */
+#ifdef POSIX_SPAWN_USEVFORK
+ ret = posix_spawnattr_setflags (&attr, POSIX_SPAWN_USEVFORK);
+ if (ret)
+ {
+ *err = ret;
+ *errmsg = "posix_spawnattr_setflags";
+ goto exit;
+ }
+#endif
+
+ ret = posix_spawn_file_actions_init (&actions);
+ if (ret)
+ {
+ *err = ret;
+ *errmsg = "posix_spawn_file_actions_init";
+ goto exit;
+ }
+ actions_initialized = 1;
+
+ if (in != STDIN_FILE_NO)
+ {
+ ret = posix_spawn_file_actions_adddup2 (&actions, in, STDIN_FILE_NO);
+ if (ret)
+ {
+ *err = ret;
+ *errmsg = "posix_spawn_file_actions_adddup2";
+ goto exit;
+ }
+
+ ret = posix_spawn_file_actions_addclose (&actions, in);
+ if (ret)
+ {
+ *err = ret;
+ *errmsg = "posix_spawn_file_actions_addclose";
+ goto exit;
+ }
+ }
+
+ if (out != STDOUT_FILE_NO)
+ {
+ ret = posix_spawn_file_actions_adddup2 (&actions, out, STDOUT_FILE_NO);
+ if (ret)
+ {
+ *err = ret;
+ *errmsg = "posix_spawn_file_actions_adddup2";
+ goto exit;
+ }
+
+ ret = posix_spawn_file_actions_addclose (&actions, out);
+ if (ret)
+ {
+ *err = ret;
+ *errmsg = "posix_spawn_file_actions_addclose";
+ goto exit;
+ }
+ }
+
+ if (errdes != STDERR_FILE_NO)
+ {
+ ret = posix_spawn_file_actions_adddup2 (&actions, errdes, STDERR_FILE_NO);
+ if (ret)
+ {
+ *err = ret;
+ *errmsg = "posix_spawn_file_actions_adddup2";
+ goto exit;
+ }
+
+ ret = posix_spawn_file_actions_addclose (&actions, errdes);
+ if (ret)
+ {
+ *err = ret;
+ *errmsg = "posix_spawn_file_actions_addclose";
+ goto exit;
+ }
+ }
+
+ if (toclose >= 0)
+ {
+ ret = posix_spawn_file_actions_addclose (&actions, toclose);
+ if (ret)
+ {
+ *err = ret;
+ *errmsg = "posix_spawn_file_actions_addclose";
+ goto exit;
+ }
+ }
+
+ if ((flags & PEX_STDERR_TO_STDOUT) != 0)
+ {
+ ret = posix_spawn_file_actions_adddup2 (&actions, STDOUT_FILE_NO, STDERR_FILE_NO);
+ if (ret)
+ {
+ *err = ret;
+ *errmsg = "posix_spawn_file_actions_adddup2";
+ goto exit;
+ }
+ }
+
+ if ((flags & PEX_SEARCH) != 0)
+ {
+ ret = posix_spawnp (&pid, executable, &actions, &attr, argv, env ? env : environ);
+ if (ret)
+ {
+ *err = ret;
+ *errmsg = "posix_spawnp";
+ pid = -1; /* The value of pid is unspecified on failure. */
+ goto exit;
+ }
+ }
+ else
+ {
+ ret = posix_spawn (&pid, executable, &actions, &attr, argv, env ? env : environ);
+ if (ret)
+ {
+ *err = ret;
+ *errmsg = "posix_spawn";
+ pid = -1;
+ goto exit;
+ }
+ }
+
+exit:
+ if (actions_initialized)
+ posix_spawn_file_actions_destroy (&actions);
+ if (attr_initialized)
+ posix_spawnattr_destroy (&attr);
+
+ if (!*err && in != STDIN_FILE_NO)
+ if (close (in))
+ *errmsg = "close", *err = errno, pid = -1;
+ if (!*err && out != STDOUT_FILE_NO)
+ if (close (out))
+ *errmsg = "close", *err = errno, pid = -1;
+ if (!*err && errdes != STDERR_FILE_NO)
+ if (close (errdes))
+ *errmsg = "close", *err = errno, pid = -1;
+
+ return pid;
+}
#else
/* Implementation of pex->exec_child using standard vfork + exec. */
/* Wait for a child process to complete. */
-static int
+static pid_t
pex_unix_wait (struct pex_obj *obj, pid_t pid, int *status,
struct pex_time *time, int done, const char **errmsg,
int *err)