1 /* $NetBSD: fexec.c,v 1.1.1.3 2009/08/06 16:55:26 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matthias Scheler. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 33 #if HAVE_CONFIG_H 34 #include "config.h" 35 #endif 36 #include <nbcompat.h> 37 #if HAVE_SYS_CDEFS_H 38 #include <sys/cdefs.h> 39 #endif 40 #if HAVE_SYS_WAIT_H 41 #include <sys/wait.h> 42 #endif 43 44 #if HAVE_ERR_H 45 #include <err.h> 46 #endif 47 #if HAVE_ERRNO_H 48 #include <errno.h> 49 #endif 50 #if HAVE_STDARG_H 51 #include <stdarg.h> 52 #endif 53 #if HAVE_STDLIB_H 54 #include <stdlib.h> 55 #endif 56 #if HAVE_UNISTD_H 57 #include <unistd.h> 58 #endif 59 60 #include "lib.h" 61 62 __RCSID("$NetBSD: fexec.c,v 1.1.1.3 2009/08/06 16:55:26 joerg Exp $"); 63 64 static int vfcexec(const char *, int, const char *, va_list); 65 66 /* 67 * fork, then change current working directory to path and 68 * execute the command and arguments in the argv array. 69 * wait for the command to finish, then return the exit status. 70 */ 71 int 72 pfcexec(const char *path, const char *file, const char **argv) 73 { 74 pid_t child; 75 int status; 76 77 child = vfork(); 78 switch (child) { 79 case 0: 80 if ((path != NULL) && (chdir(path) < 0)) 81 _exit(127); 82 83 (void)execvp(file, __UNCONST(argv)); 84 _exit(127); 85 /* NOTREACHED */ 86 case -1: 87 return -1; 88 } 89 90 while (waitpid(child, &status, 0) < 0) { 91 if (errno != EINTR) 92 return -1; 93 } 94 95 if (!WIFEXITED(status)) 96 return -1; 97 98 return WEXITSTATUS(status); 99 } 100 101 static int 102 vfcexec(const char *path, int skipempty, const char *arg, va_list ap) 103 { 104 const char **argv; 105 size_t argv_size, argc; 106 int retval; 107 108 argv_size = 16; 109 argv = xcalloc(argv_size, sizeof(*argv)); 110 111 argv[0] = arg; 112 argc = 1; 113 114 do { 115 if (argc == argv_size) { 116 argv_size *= 2; 117 argv = xrealloc(argv, argv_size * sizeof(*argv)); 118 } 119 arg = va_arg(ap, const char *); 120 if (skipempty && arg && strlen(arg) == 0) 121 continue; 122 argv[argc++] = arg; 123 } while (arg != NULL); 124 125 retval = pfcexec(path, argv[0], argv); 126 free(argv); 127 return retval; 128 } 129 130 int 131 fexec(const char *arg, ...) 132 { 133 va_list ap; 134 int result; 135 136 va_start(ap, arg); 137 result = vfcexec(NULL, 0, arg, ap); 138 va_end(ap); 139 140 return result; 141 } 142 143 int 144 fexec_skipempty(const char *arg, ...) 145 { 146 va_list ap; 147 int result; 148 149 va_start(ap, arg); 150 result = vfcexec(NULL, 1, arg, ap); 151 va_end(ap); 152 153 return result; 154 } 155 156 int 157 fcexec(const char *path, const char *arg, ...) 158 { 159 va_list ap; 160 int result; 161 162 va_start(ap, arg); 163 result = vfcexec(path, 0, arg, ap); 164 va_end(ap); 165 166 return result; 167 } 168