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/* $OpenBSD: simple_exec.c,v 1.1 1998/08/12 23:53:53 art Exp $ */
/* $KTH: simple_exec.c,v 1.1 1998/03/19 19:41:19 joda Exp $ */
/*
* Copyright (c) 1998 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Kungliga Tekniska
* Högskolan and its contributors.
*
* 4. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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 <stdarg.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#define EX_NOEXEC 126
#define EX_NOTFOUND 127
/* return values:
-1 on `unspecified' system errors
-2 on fork failures
-3 on waitpid errors
0- is return value from subprocess
126 if the program couldn't be executed
127 if the program couldn't be found
128- is 128 + signal that killed subprocess
*/
int
simple_execvp(const char *file, char *const args[])
{
pid_t pid = fork();
switch(pid){
case -1:
return -2;
case 0:
execvp(file, args);
exit((errno == ENOENT) ? EX_NOTFOUND : EX_NOEXEC);
default:
while(1) {
int status;
if(waitpid(pid, &status, 0) < 0) {
return -3;
}
if(WIFSTOPPED(status))
continue;
if(WIFEXITED(status))
return WEXITSTATUS(status);
if(WIFSIGNALED(status))
return WTERMSIG(status) + 128;
}
}
}
int
simple_execlp(const char *file, ...)
{
va_list ap;
char **argv;
int argc, i;
argc = i = 0;
va_start(ap, file);
do {
if(i == argc) {
char **tmp = realloc(argv, (argc + 5) * sizeof(*argv));
if(tmp == NULL) {
errno = ENOMEM;
return -1;
}
argv = tmp;
argc += 5;
}
argv[i++] = va_arg(ap, char*);
} while(argv[i - 1] != NULL);
va_end(ap);
i = simple_execvp(file, argv);
free(argv);
return i;
}
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