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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151/* Copyright (C) 2006 by Paolo Giarrusso - modified from glibc' execvp.c. Original copyright notice follows:
Copyright (C) 1991,92,1995-99,2002,2004 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 <unistd.h>
#include <stdbool.h>#include <stdlib.h>#include <string.h>#include <errno.h>#include <limits.h>
#ifndef TEST#include <um_malloc.h>#else#include <stdio.h>#define um_kmalloc malloc#endif#include <os.h>
/* Execute FILE, searching in the `PATH' environment variable if it contains no slashes, with arguments ARGV and environment from `environ'. */int execvp_noalloc(char *buf, const char *file, char *const argv[]){ if (*file == '\0') { return -ENOENT; }
if (strchr (file, '/') != NULL) { /* Don't search when it contains a slash. */ execv(file, argv); } else { int got_eacces; size_t len, pathlen; char *name, *p; char *path = getenv("PATH"); if (path == NULL) path = ":/bin:/usr/bin";
len = strlen(file) + 1; pathlen = strlen(path); /* Copy the file name at the top. */ name = memcpy(buf + pathlen + 1, file, len); /* And add the slash. */ *--name = '/';
got_eacces = 0; p = path; do { char *startp;
path = p; //Let's avoid this GNU extension. //p = strchrnul (path, ':'); p = strchr(path, ':'); if (!p) p = strchr(path, '\0');
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 = memcpy(name - (p - path), path, p - path);
/* Try to execute this name. If it works, execv will not return. */ execv(startp, argv);
/* if (errno == ENOEXEC) { } */
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 = 1; break; 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. */ case ENOEXEC: /* We won't go searching for the shell * if it is not executable - the Linux * kernel already handles this enough, * for us. */ break;
default: /* Some other error means we found an executable file, but something went wrong executing it; return the error to our caller. */ return -errno; } } 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. */ return -EACCES; }
/* Return the error from the last attempt (probably ENOENT). */ return -errno;}#ifdef TESTint main(int argc, char**argv){ char buf[PATH_MAX]; int ret; argc--; if (!argc) { os_warn("Not enough arguments\n"); return 1; } argv++; if (ret = execvp_noalloc(buf, argv[0], argv)) { errno = -ret; perror("execvp_noalloc"); } return 0;}#endif