diff options
Diffstat (limited to 'posix/execvp.c')
| -rw-r--r-- | posix/execvp.c | 128 |
1 files changed, 92 insertions, 36 deletions
diff --git a/posix/execvp.c b/posix/execvp.c index d6f60c02e7..887379e3a2 100644 --- a/posix/execvp.c +++ b/posix/execvp.c @@ -1,4 +1,5 @@ -/* Copyright (C) 1991,92,1995-99,2002,2004 Free Software Foundation, Inc. +/* Copyright (C) 1991,92, 1995-99, 2002, 2004, 2005, 2007 + 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 @@ -16,8 +17,10 @@ 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> @@ -28,27 +31,16 @@ the shell to interpret it as a script. */ static void internal_function -script_execute (const char *file, char *const argv[]) +scripts_argv (const char *file, char *const argv[], int argc, char **new_argv) { - /* 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, __environ); - } + new_argv[0] = (char *) _PATH_BSHELL; + new_argv[1] = (char *) file; + while (argc > 1) + { + new_argv[argc] = argv[argc - 1]; + --argc; + } } @@ -72,36 +64,74 @@ execvp (file, argv) __execve (file, argv, __environ); if (errno == ENOEXEC) - script_execute (file, argv); + { + /* 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 { - int got_eacces = 0; - char *path, *p, *name; - size_t len; 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; + } - 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 = name + pathlen + len + 1; path[0] = ':'; - (void) confstr (_CS_PATH, path + 1, len); + (void) confstr (_CS_PATH, path + 1, pathlen); } - 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; + char **script_argv = NULL; + void *script_argv_malloc = NULL; + bool got_eacces = false; + char *p = path; do { char *startp; @@ -116,11 +146,34 @@ execvp (file, argv) else startp = (char *) memcpy (name - (p - path), path, p - path); - /* Try to execute this name. If it works, execv will not return. */ + /* Try to execute this name. If it works, execve will not return. */ __execve (startp, argv, __environ); if (errno == ENOEXEC) - script_execute (startp, argv); + { + 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) { @@ -128,7 +181,7 @@ execvp (file, argv) /* 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 = 1; + got_eacces = true; case ENOENT: case ESTALE: case ENOTDIR: @@ -154,8 +207,11 @@ execvp (file, argv) /* We tried every element and none of them worked. */ if (got_eacces) /* At least one failure was due to permissions, so report that - error. */ + error. */ __set_errno (EACCES); + + free (script_argv_malloc); + free (path_malloc); } /* Return the error from the last attempt (probably ENOENT). */ |