172 lines
4.1 KiB
C
172 lines
4.1 KiB
C
/*
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* Copyright (c) 1998, 1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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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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*
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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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*
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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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*
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* 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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RCSID("$Id: simple_exec.c,v 1.6 1999/12/02 16:58:52 joda Exp $");
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#endif
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#include <stdarg.h>
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#include <stdlib.h>
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <errno.h>
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#include <roken.h>
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#define EX_NOEXEC 126
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#define EX_NOTFOUND 127
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/* return values:
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-1 on `unspecified' system errors
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-2 on fork failures
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-3 on waitpid errors
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0- is return value from subprocess
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126 if the program couldn't be executed
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127 if the program couldn't be found
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128- is 128 + signal that killed subprocess
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*/
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static int
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check_status(pid_t pid)
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{
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while(1) {
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int status;
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while(waitpid(pid, &status, 0) < 0)
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if (errno != EINTR)
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return -3;
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if(WIFSTOPPED(status))
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continue;
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if(WIFEXITED(status))
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return WEXITSTATUS(status);
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if(WIFSIGNALED(status))
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return WTERMSIG(status) + 128;
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}
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}
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int
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simple_execvp(const char *file, char *const args[])
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{
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pid_t pid = fork();
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switch(pid){
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case -1:
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return -2;
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case 0:
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execvp(file, args);
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exit((errno == ENOENT) ? EX_NOTFOUND : EX_NOEXEC);
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default:
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return check_status(pid);
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}
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}
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/* gee, I'd like a execvpe */
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int
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simple_execve(const char *file, char *const args[], char *const envp[])
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{
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pid_t pid = fork();
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switch(pid){
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case -1:
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return -2;
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case 0:
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execve(file, args, envp);
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exit((errno == ENOENT) ? EX_NOTFOUND : EX_NOEXEC);
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default:
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return check_status(pid);
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}
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}
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static char **
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collect_args(va_list *ap)
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{
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char **argv = NULL;
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int argc = 0, i = 0;
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do {
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if(i == argc) {
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/* realloc argv */
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char **tmp = realloc(argv, (argc + 5) * sizeof(*argv));
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if(tmp == NULL) {
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errno = ENOMEM;
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return NULL;
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}
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argv = tmp;
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argc += 5;
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}
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argv[i++] = va_arg(*ap, char*);
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} while(argv[i - 1] != NULL);
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return argv;
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}
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int
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simple_execlp(const char *file, ...)
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{
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va_list ap;
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char **argv;
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int ret;
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va_start(ap, file);
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argv = collect_args(&ap);
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va_end(ap);
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if(argv == NULL)
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return -1;
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ret = simple_execvp(file, argv);
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free(argv);
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return ret;
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}
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int
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simple_execle(const char *file, ... /* ,char *const envp[] */)
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{
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va_list ap;
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char **argv;
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char *const* envp;
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int ret;
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va_start(ap, file);
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argv = collect_args(&ap);
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envp = va_arg(ap, char **);
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va_end(ap);
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if(argv == NULL)
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return -1;
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ret = simple_execve(file, argv, envp);
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free(argv);
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return ret;
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}
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