12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091 |
- /*
- * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
- * The President and Fellows of Harvard College.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include <errno.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <string.h>
- /*
- * system(): ANSI C
- *
- * Run a command.
- */
- #define MAXCMDSIZE 2048
- #define MAXARGS 128
- int
- system(const char *cmd)
- {
- /*
- * Ordinarily, you call the shell to process the command.
- * But we don't know that the shell can do that. So, do it
- * ourselves.
- */
- char tmp[MAXCMDSIZE];
- char *argv[MAXARGS+1];
- int nargs=0;
- char *s;
- int pid, status;
- if (strlen(cmd) >= sizeof(tmp)) {
- errno = E2BIG;
- return -1;
- }
- strcpy(tmp, cmd);
- for (s = strtok(tmp, " \t"); s; s = strtok(NULL, " \t")) {
- if (nargs < MAXARGS) {
- argv[nargs++] = s;
- }
- else {
- errno = E2BIG;
- return 1;
- }
- }
- argv[nargs] = NULL;
- pid = fork();
- switch (pid) {
- case -1:
- return -1;
- case 0:
- /* child */
- execv(argv[0], argv);
- /* exec only returns if it fails */
- _exit(255);
- default:
- /* parent */
- waitpid(pid, &status, 0);
- return status;
- }
- }
|