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Implement execvpe.

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There is some existing practice in other OSes and it's trivial to
implement giving the existing code.  Fixes BZ #10221.
This commit is contained in:
Ulrich Drepper 2009-06-02 07:03:02 -07:00
parent fd96f06208
commit 3d5243d416
7 changed files with 248 additions and 192 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2009-06-02 Ulrich Drepper <drepper@redhat.com>
[BZ #10221]
* posix/Makefile (routines): Add execvpe.
* posix/Versions: Export execvpe for GLIBC_2.11.
* posix/execvp.c: Now only a wrapper. Move code to...
* posix/execvpe.c: ...here. New file.
* posix/unistd.h: Declare execvpe.
2009-06-01 Ulrich Drepper <drepper@redhat.com>
* sysdeps/i386/dl-machine.h (elf_machine_rel): Reorder conditions

5
NEWS
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@ -1,4 +1,4 @@
GNU C Library NEWS -- history of user-visible changes. 2009-5-31
GNU C Library NEWS -- history of user-visible changes. 2009-6-1
Copyright (C) 1992-2008, 2009 Free Software Foundation, Inc.
See the end for copying conditions.
@ -7,6 +7,9 @@ using `glibc' in the "product" field.
Version 2.11
* New interfaces: execvpe
Implemented by Ulrich Drepper.
* checking version of longjmp added that fails if an uninitialized stack
frame would be created. Implemented by Ulrich Drepper.

2
posix/Makefile
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@ -43,7 +43,7 @@ routines := \
wait waitpid wait3 wait4 waitid \
alarm sleep pause nanosleep \
fork vfork _exit \
execve fexecve execv execle execl execvp execlp \
execve fexecve execv execle execl execvp execlp execvpe \
getpid getppid \
getuid geteuid getgid getegid getgroups setuid setgid group_member \
getpgid setpgid getpgrp bsd-getpgrp setpgrp getsid setsid \

3
posix/Versions
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@ -131,6 +131,9 @@ libc {
GLIBC_2.10 {
__posix_getopt;
}
GLIBC_2.11 {
execvpe;
}
GLIBC_PRIVATE {
__libc_fork; __libc_pwrite;
}

192
posix/execvp.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1991,92, 1995-99, 2002, 2004, 2005, 2007
/* Copyright (C) 1991,92, 1995-99, 2002, 2004, 2005, 2007, 2009
Free Software Foundation, Inc.
This file is part of the GNU C Library.
@ -17,31 +17,7 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <alloca.h>
#include <unistd.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <paths.h>
/* The file is accessible but it is not an executable file. Invoke
the shell to interpret it as a script. */
static void
internal_function
scripts_argv (const char *file, char *const argv[], int argc, char **new_argv)
{
/* Construct an argument list for the shell. */
new_argv[0] = (char *) _PATH_BSHELL;
new_argv[1] = (char *) file;
while (argc > 1)
{
new_argv[argc] = argv[argc - 1];
--argc;
}
}
/* Execute FILE, searching in the `PATH' environment variable if it contains
@ -51,170 +27,6 @@ execvp (file, argv)
const char *file;
char *const argv[];
{
if (*file == '\0')
{
/* We check the simple case first. */
__set_errno (ENOENT);
return -1;
}
if (strchr (file, '/') != NULL)
{
/* Don't search when it contains a slash. */
__execve (file, argv, __environ);
if (errno == ENOEXEC)
{
/* Count the arguments. */
int argc = 0;
while (argv[argc++])
;
size_t len = (argc + 1) * sizeof (char *);
char **script_argv;
void *ptr = NULL;
if (__libc_use_alloca (len))
script_argv = alloca (len);
else
script_argv = ptr = malloc (len);
if (script_argv != NULL)
{
scripts_argv (file, argv, argc, script_argv);
__execve (script_argv[0], script_argv, __environ);
free (ptr);
}
}
}
else
{
size_t pathlen;
size_t alloclen = 0;
char *path = getenv ("PATH");
if (path == NULL)
{
pathlen = confstr (_CS_PATH, (char *) NULL, 0);
alloclen = pathlen + 1;
}
else
pathlen = strlen (path);
size_t len = strlen (file) + 1;
alloclen += pathlen + len + 1;
char *name;
char *path_malloc = NULL;
if (__libc_use_alloca (alloclen))
name = alloca (alloclen);
else
{
path_malloc = name = malloc (alloclen);
if (name == NULL)
return -1;
}
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'. */
path = name + pathlen + len + 1;
path[0] = ':';
(void) confstr (_CS_PATH, path + 1, pathlen);
}
/* Copy the file name at the top. */
name = (char *) memcpy (name + pathlen + 1, file, len);
/* And add the slash. */
*--name = '/';
char **script_argv = NULL;
void *script_argv_malloc = NULL;
bool got_eacces = false;
char *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, execve will not return. */
__execve (startp, argv, __environ);
if (errno == ENOEXEC)
{
if (script_argv == NULL)
{
/* Count the arguments. */
int argc = 0;
while (argv[argc++])
;
size_t arglen = (argc + 1) * sizeof (char *);
if (__libc_use_alloca (alloclen + arglen))
script_argv = alloca (arglen);
else
script_argv = script_argv_malloc = malloc (arglen);
if (script_argv == NULL)
{
/* A possible EACCES error is not as important as
the ENOMEM. */
got_eacces = false;
break;
}
scripts_argv (startp, argv, argc, script_argv);
}
__execve (script_argv[0], script_argv, __environ);
}
switch (errno)
{
case EACCES:
/* Record the we got a `Permission denied' error. If we end
up finding no executable we can use, we want to diagnose
that we did find one but were denied access. */
got_eacces = true;
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. */
case ENODEV:
case ETIMEDOUT:
/* Some strange filesystems like AFS return even
stranger error numbers. They cannot reasonably mean
anything else so ignore those, too. */
break;
default:
/* Some other error means we found an executable file, but
something went wrong executing it; return the error to our
caller. */
return -1;
}
}
while (*p++ != '\0');
/* We tried every element and none of them worked. */
if (got_eacces)
/* At least one failure was due to permissions, so report that
error. */
__set_errno (EACCES);
free (script_argv_malloc);
free (path_malloc);
}
/* Return the error from the last attempt (probably ENOENT). */
return -1;
return __execvpe (file, argv, __environ);
}
libc_hidden_def (execvp)

221
posix/execvpe.c Normal file
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@ -0,0 +1,221 @@
/* Copyright (C) 1991,92, 1995-99, 2002, 2004, 2005, 2007, 2009
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 <alloca.h>
#include <unistd.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <paths.h>
/* The file is accessible but it is not an executable file. Invoke
the shell to interpret it as a script. */
static void
internal_function
scripts_argv (const char *file, char *const argv[], int argc, char **new_argv)
{
/* Construct an argument list for the shell. */
new_argv[0] = (char *) _PATH_BSHELL;
new_argv[1] = (char *) file;
while (argc > 1)
{
new_argv[argc] = argv[argc - 1];
--argc;
}
}
/* Execute FILE, searching in the `PATH' environment variable if it contains
no slashes, with arguments ARGV and environment from ENVP. */
int
__execvpe (file, argv, envp)
const char *file;
char *const argv[];
char *const envp[];
{
if (*file == '\0')
{
/* We check the simple case first. */
__set_errno (ENOENT);
return -1;
}
if (strchr (file, '/') != NULL)
{
/* Don't search when it contains a slash. */
__execve (file, argv, envp);
if (errno == ENOEXEC)
{
/* Count the arguments. */
int argc = 0;
while (argv[argc++])
;
size_t len = (argc + 1) * sizeof (char *);
char **script_argv;
void *ptr = NULL;
if (__libc_use_alloca (len))
script_argv = alloca (len);
else
script_argv = ptr = malloc (len);
if (script_argv != NULL)
{
scripts_argv (file, argv, argc, script_argv);
__execve (script_argv[0], script_argv, envp);
free (ptr);
}
}
}
else
{
size_t pathlen;
size_t alloclen = 0;
char *path = getenv ("PATH");
if (path == NULL)
{
pathlen = confstr (_CS_PATH, (char *) NULL, 0);
alloclen = pathlen + 1;
}
else
pathlen = strlen (path);
size_t len = strlen (file) + 1;
alloclen += pathlen + len + 1;
char *name;
char *path_malloc = NULL;
if (__libc_use_alloca (alloclen))
name = alloca (alloclen);
else
{
path_malloc = name = malloc (alloclen);
if (name == NULL)
return -1;
}
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'. */
path = name + pathlen + len + 1;
path[0] = ':';
(void) confstr (_CS_PATH, path + 1, pathlen);
}
/* Copy the file name at the top. */
name = (char *) memcpy (name + pathlen + 1, file, len);
/* And add the slash. */
*--name = '/';
char **script_argv = NULL;
void *script_argv_malloc = NULL;
bool got_eacces = false;
char *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, execve will not return. */
__execve (startp, argv, envp);
if (errno == ENOEXEC)
{
if (script_argv == NULL)
{
/* Count the arguments. */
int argc = 0;
while (argv[argc++])
;
size_t arglen = (argc + 1) * sizeof (char *);
if (__libc_use_alloca (alloclen + arglen))
script_argv = alloca (arglen);
else
script_argv = script_argv_malloc = malloc (arglen);
if (script_argv == NULL)
{
/* A possible EACCES error is not as important as
the ENOMEM. */
got_eacces = false;
break;
}
scripts_argv (startp, argv, argc, script_argv);
}
__execve (script_argv[0], script_argv, envp);
}
switch (errno)
{
case EACCES:
/* Record the we got a `Permission denied' error. If we end
up finding no executable we can use, we want to diagnose
that we did find one but were denied access. */
got_eacces = true;
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. */
case ENODEV:
case ETIMEDOUT:
/* Some strange filesystems like AFS return even
stranger error numbers. They cannot reasonably mean
anything else so ignore those, too. */
break;
default:
/* Some other error means we found an executable file, but
something went wrong executing it; return the error to our
caller. */
return -1;
}
}
while (*p++ != '\0');
/* We tried every element and none of them worked. */
if (got_eacces)
/* At least one failure was due to permissions, so report that
error. */
__set_errno (EACCES);
free (script_argv_malloc);
free (path_malloc);
}
/* Return the error from the last attempt (probably ENOENT). */
return -1;
}
weak_alias (__execvpe, execvpe)

8
posix/unistd.h
View File

@ -551,6 +551,14 @@ extern int execvp (__const char *__file, char *__const __argv[])
extern int execlp (__const char *__file, __const char *__arg, ...)
__THROW __nonnull ((1));
#ifdef __USE_GNU
/* Execute FILE, searching in the `PATH' environment variable if it contains
no slashes, with arguments ARGV and environment from `environ'. */
extern int execvpe (__const char *__file, char *__const __argv[],
char *__const __envp[])
__THROW __nonnull ((1));
#endif
#if defined __USE_MISC || defined __USE_XOPEN
/* Add INC to priority of the current process. */