2 * Copyright (c) 1998, 1999 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 RCSID("$Id: simple_exec.c,v 1.6 1999/12/02 16:58:52 joda Exp $");
41 #ifdef HAVE_SYS_TYPES_H
42 #include <sys/types.h>
44 #ifdef HAVE_SYS_WAIT_H
55 #define EX_NOTFOUND 127
58 -1 on `unspecified' system errors
61 0- is return value from subprocess
62 126 if the program couldn't be executed
63 127 if the program couldn't be found
64 128- is 128 + signal that killed subprocess
68 check_status(pid_t pid)
73 while(waitpid(pid, &status, 0) < 0)
76 if(WIFSTOPPED(status))
79 return WEXITSTATUS(status);
80 if(WIFSIGNALED(status))
81 return WTERMSIG(status) + 128;
86 simple_execvp(const char *file, char *const args[])
94 exit((errno == ENOENT) ? EX_NOTFOUND : EX_NOEXEC);
96 return check_status(pid);
100 /* gee, I'd like a execvpe */
102 simple_execve(const char *file, char *const args[], char *const envp[])
109 execve(file, args, envp);
110 exit((errno == ENOENT) ? EX_NOTFOUND : EX_NOEXEC);
112 return check_status(pid);
117 collect_args(va_list *ap)
124 char **tmp = realloc(argv, (argc + 5) * sizeof(*argv));
132 argv[i++] = va_arg(*ap, char*);
133 } while(argv[i - 1] != NULL);
138 simple_execlp(const char *file, ...)
145 argv = collect_args(&ap);
149 ret = simple_execvp(file, argv);
155 simple_execle(const char *file, ... /* ,char *const envp[] */)
163 argv = collect_args(&ap);
164 envp = va_arg(ap, char **);
168 ret = simple_execve(file, argv, envp);