Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/sysdeps/posix/spawni.c
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
305 lines (258 sloc)
8.43 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* Guts of POSIX spawn interface. Generic POSIX.1 version. | |
Copyright (C) 2000-2005, 2006, 2011 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#include <errno.h> | |
#include <fcntl.h> | |
#include <paths.h> | |
#include <spawn.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include <sys/resource.h> | |
#include "spawn_int.h" | |
#include <not-cancel.h> | |
#include <local-setxid.h> | |
/* The Unix standard contains a long explanation of the way to signal | |
an error after the fork() was successful. Since no new wait status | |
was wanted there is no way to signal an error using one of the | |
available methods. The committee chose to signal an error by a | |
normal program exit with the exit code 127. */ | |
#define SPAWN_ERROR 127 | |
/* The file is accessible but it is not an executable file. Invoke | |
the shell to interpret it as a script. */ | |
static void | |
internal_function | |
script_execute (const char *file, char *const argv[], char *const envp[]) | |
{ | |
/* Count the arguments. */ | |
int argc = 0; | |
while (argv[argc++]) | |
; | |
/* Construct an argument list for the shell. */ | |
{ | |
char *new_argv[argc + 1]; | |
new_argv[0] = (char *) _PATH_BSHELL; | |
new_argv[1] = (char *) file; | |
while (argc > 1) | |
{ | |
new_argv[argc] = argv[argc - 1]; | |
--argc; | |
} | |
/* Execute the shell. */ | |
__execve (new_argv[0], new_argv, envp); | |
} | |
} | |
/* Spawn a new process executing PATH with the attributes describes in *ATTRP. | |
Before running the process perform the actions described in FILE-ACTIONS. */ | |
int | |
__spawni (pid_t *pid, const char *file, | |
const posix_spawn_file_actions_t *file_actions, | |
const posix_spawnattr_t *attrp, char *const argv[], | |
char *const envp[], int use_path) | |
{ | |
pid_t new_pid; | |
char *path, *p, *name; | |
size_t len; | |
size_t pathlen; | |
/* Do this once. */ | |
short int flags = attrp == NULL ? 0 : attrp->__flags; | |
/* Generate the new process. */ | |
if ((flags & POSIX_SPAWN_USEVFORK) != 0 | |
/* If no major work is done, allow using vfork. Note that we | |
might perform the path searching. But this would be done by | |
a call to execvp(), too, and such a call must be OK according | |
to POSIX. */ | |
|| ((flags & (POSIX_SPAWN_SETSIGMASK | POSIX_SPAWN_SETSIGDEF | |
| POSIX_SPAWN_SETSCHEDPARAM | POSIX_SPAWN_SETSCHEDULER | |
| POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_RESETIDS)) == 0 | |
&& file_actions == NULL)) | |
new_pid = __vfork (); | |
else | |
new_pid = __fork (); | |
if (new_pid != 0) | |
{ | |
if (new_pid < 0) | |
return errno; | |
/* The call was successful. Store the PID if necessary. */ | |
if (pid != NULL) | |
*pid = new_pid; | |
return 0; | |
} | |
/* Set signal mask. */ | |
if ((flags & POSIX_SPAWN_SETSIGMASK) != 0 | |
&& __sigprocmask (SIG_SETMASK, &attrp->__ss, NULL) != 0) | |
_exit (SPAWN_ERROR); | |
/* Set signal default action. */ | |
if ((flags & POSIX_SPAWN_SETSIGDEF) != 0) | |
{ | |
/* We have to iterate over all signals. This could possibly be | |
done better but it requires system specific solutions since | |
the sigset_t data type can be very different on different | |
architectures. */ | |
int sig; | |
struct sigaction sa; | |
memset (&sa, '\0', sizeof (sa)); | |
sa.sa_handler = SIG_DFL; | |
for (sig = 1; sig <= _NSIG; ++sig) | |
if (__sigismember (&attrp->__sd, sig) != 0 | |
&& __sigaction (sig, &sa, NULL) != 0) | |
_exit (SPAWN_ERROR); | |
} | |
#ifdef _POSIX_PRIORITY_SCHEDULING | |
/* Set the scheduling algorithm and parameters. */ | |
if ((flags & (POSIX_SPAWN_SETSCHEDPARAM | POSIX_SPAWN_SETSCHEDULER)) | |
== POSIX_SPAWN_SETSCHEDPARAM) | |
{ | |
if (__sched_setparam (0, &attrp->__sp) == -1) | |
_exit (SPAWN_ERROR); | |
} | |
else if ((flags & POSIX_SPAWN_SETSCHEDULER) != 0) | |
{ | |
if (__sched_setscheduler (0, attrp->__policy, &attrp->__sp) == -1) | |
_exit (SPAWN_ERROR); | |
} | |
#endif | |
/* Set the process group ID. */ | |
if ((flags & POSIX_SPAWN_SETPGROUP) != 0 | |
&& __setpgid (0, attrp->__pgrp) != 0) | |
_exit (SPAWN_ERROR); | |
/* Set the effective user and group IDs. */ | |
if ((flags & POSIX_SPAWN_RESETIDS) != 0 | |
&& (local_seteuid (__getuid ()) != 0 | |
|| local_setegid (__getgid ()) != 0)) | |
_exit (SPAWN_ERROR); | |
/* Execute the file actions. */ | |
if (file_actions != NULL) | |
{ | |
int cnt; | |
struct rlimit64 fdlimit; | |
bool have_fdlimit = false; | |
for (cnt = 0; cnt < file_actions->__used; ++cnt) | |
{ | |
struct __spawn_action *action = &file_actions->__actions[cnt]; | |
switch (action->tag) | |
{ | |
case spawn_do_close: | |
if (close_not_cancel (action->action.close_action.fd) != 0) | |
{ | |
if (! have_fdlimit) | |
{ | |
getrlimit64 (RLIMIT_NOFILE, &fdlimit); | |
have_fdlimit = true; | |
} | |
/* Only signal errors for file descriptors out of range. */ | |
if (action->action.close_action.fd < 0 | |
|| action->action.close_action.fd >= fdlimit.rlim_cur) | |
/* Signal the error. */ | |
_exit (SPAWN_ERROR); | |
} | |
break; | |
case spawn_do_open: | |
{ | |
int new_fd = open_not_cancel (action->action.open_action.path, | |
action->action.open_action.oflag | |
| O_LARGEFILE, | |
action->action.open_action.mode); | |
if (new_fd == -1) | |
/* The `open' call failed. */ | |
_exit (SPAWN_ERROR); | |
/* Make sure the desired file descriptor is used. */ | |
if (new_fd != action->action.open_action.fd) | |
{ | |
if (__dup2 (new_fd, action->action.open_action.fd) | |
!= action->action.open_action.fd) | |
/* The `dup2' call failed. */ | |
_exit (SPAWN_ERROR); | |
if (close_not_cancel (new_fd) != 0) | |
/* The `close' call failed. */ | |
_exit (SPAWN_ERROR); | |
} | |
} | |
break; | |
case spawn_do_dup2: | |
if (__dup2 (action->action.dup2_action.fd, | |
action->action.dup2_action.newfd) | |
!= action->action.dup2_action.newfd) | |
/* The `dup2' call failed. */ | |
_exit (SPAWN_ERROR); | |
break; | |
} | |
} | |
} | |
if (! use_path || strchr (file, '/') != NULL) | |
{ | |
/* The FILE parameter is actually a path. */ | |
__execve (file, argv, envp); | |
if (errno == ENOEXEC) | |
script_execute (file, argv, envp); | |
/* Oh, oh. `execve' returns. This is bad. */ | |
_exit (SPAWN_ERROR); | |
} | |
/* We have to search for FILE on the path. */ | |
path = getenv ("PATH"); | |
if (path == NULL) | |
{ | |
/* There is no `PATH' in the environment. | |
The default search path is the current directory | |
followed by the path `confstr' returns for `_CS_PATH'. */ | |
len = confstr (_CS_PATH, (char *) NULL, 0); | |
path = (char *) __alloca (1 + len); | |
path[0] = ':'; | |
(void) confstr (_CS_PATH, path + 1, len); | |
} | |
len = strlen (file) + 1; | |
pathlen = strlen (path); | |
name = __alloca (pathlen + len + 1); | |
/* Copy the file name at the top. */ | |
name = (char *) memcpy (name + pathlen + 1, file, len); | |
/* And add the slash. */ | |
*--name = '/'; | |
p = path; | |
do | |
{ | |
char *startp; | |
path = p; | |
p = __strchrnul (path, ':'); | |
if (p == path) | |
/* Two adjacent colons, or a colon at the beginning or the end | |
of `PATH' means to search the current directory. */ | |
startp = name + 1; | |
else | |
startp = (char *) memcpy (name - (p - path), path, p - path); | |
/* Try to execute this name. If it works, execv will not return. */ | |
__execve (startp, argv, envp); | |
if (errno == ENOEXEC) | |
script_execute (startp, argv, envp); | |
switch (errno) | |
{ | |
case EACCES: | |
case ENOENT: | |
case ESTALE: | |
case ENOTDIR: | |
/* Those errors indicate the file is missing or not executable | |
by us, in which case we want to just try the next path | |
directory. */ | |
break; | |
default: | |
/* Some other error means we found an executable file, but | |
something went wrong executing it; return the error to our | |
caller. */ | |
_exit (SPAWN_ERROR); | |
} | |
} | |
while (*p++ != '\0'); | |
/* Return with an error. */ | |
_exit (SPAWN_ERROR); | |
} |