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