1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /*LINTLIBRARY*/ 33 /* 34 * execlp(name, arg,...,0) (like execl, but does path search) 35 * execvp(name, argv) (like execv, but does path search) 36 */ 37 #include <errno.h> 38 #include <sys/param.h> 39 #include <stdarg.h> 40 #include <string.h> 41 #include <stdlib.h> 42 #include <unistd.h> 43 44 static char *execat(char *, char *, char *); 45 static char *shell = "/bin/sh"; 46 47 int 48 execlp(char *name, ...) 49 { 50 va_list args; 51 int r; 52 53 va_start(args, name); 54 r = execvp(name, (char **)args); 55 va_end(args); 56 57 return (r); 58 } 59 60 int 61 execvp(char *name, char **argv) 62 { 63 char *pathstr; 64 char fname[MAXPATHLEN]; 65 char *newargs[256]; 66 int i; 67 char *cp; 68 unsigned etxtbsy = 1; 69 int eacces = 0; 70 71 if ((pathstr = getenv("PATH")) == NULL) 72 pathstr = ":/usr/ucb:/bin:/usr/bin"; 73 cp = strchr(name, '/') ? "": pathstr; 74 75 do { 76 cp = execat(cp, name, fname); 77 retry: 78 (void) execv(fname, argv); 79 switch (errno) { 80 case ENOEXEC: 81 newargs[0] = "sh"; 82 newargs[1] = fname; 83 for (i = 1; (newargs[i+1] = argv[i]) != NULL; ++i) { 84 if (i >= 254) { 85 errno = E2BIG; 86 return(-1); 87 } 88 } 89 (void) execv(shell, newargs); 90 return (-1); 91 case ETXTBSY: 92 if (++etxtbsy > 5) 93 return (-1); 94 (void) sleep(etxtbsy); 95 goto retry; 96 case EACCES: 97 ++eacces; 98 break; 99 case ENOMEM: 100 case E2BIG: 101 case EFAULT: 102 return (-1); 103 } 104 } while (cp); 105 if (eacces) 106 errno = EACCES; 107 return (-1); 108 } 109 110 static char * 111 execat(char *s1, char *s2, char *si) 112 { 113 char *s; 114 char *end; 115 116 s = si; 117 end = s + MAXPATHLEN; 118 while (*s1 && *s1 != ':' && s < end) 119 *s++ = *s1++; 120 if (si != s && s < end) 121 *s++ = '/'; 122 while (*s2 && s < end) 123 *s++ = *s2++; 124 *s = '\0'; 125 return (*s1 ? ++s1: 0); 126 } 127