diff options
Diffstat (limited to 'posix')
| -rw-r--r-- | posix/Makefile | 2 | ||||
| -rw-r--r-- | posix/Versions | 3 | ||||
| -rw-r--r-- | posix/execvp.c | 192 | ||||
| -rw-r--r-- | posix/execvpe.c | 221 | ||||
| -rw-r--r-- | posix/unistd.h | 8 |
5 files changed, 235 insertions, 191 deletions
diff --git a/posix/Makefile b/posix/Makefile index d9a1ac7..8d8fbe5 100644 --- a/posix/Makefile +++ b/posix/Makefile @@ -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 \ diff --git a/posix/Versions b/posix/Versions index 10625f1..686c446 100644 --- a/posix/Versions +++ b/posix/Versions @@ -131,6 +131,9 @@ libc { GLIBC_2.10 { __posix_getopt; } + GLIBC_2.11 { + execvpe; + } GLIBC_PRIVATE { __libc_fork; __libc_pwrite; } diff --git a/posix/execvp.c b/posix/execvp.c index 887379e..81e6d58 100644 --- a/posix/execvp.c +++ b/posix/execvp.c @@ -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) diff --git a/posix/execvpe.c b/posix/execvpe.c new file mode 100644 index 0000000..b4f40d3 --- /dev/null +++ b/posix/execvpe.c @@ -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) diff --git a/posix/unistd.h b/posix/unistd.h index 24ec74e..cbab9f9 100644 --- a/posix/unistd.h +++ b/posix/unistd.h @@ -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. */ |