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 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 23 /* All Rights Reserved */ 24 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include "mail.h" 29 30 dowait(pidval) 31 pid_t pidval; 32 { 33 register pid_t w; 34 int status; 35 void (*istat)(), (*qstat)(); 36 37 /* 38 Parent temporarily ignores signals so it will remain 39 around for command to finish 40 */ 41 istat = signal(SIGINT, SIG_IGN); 42 qstat = signal(SIGQUIT, SIG_IGN); 43 44 while ((w = wait(&status)) != pidval && w != CERROR); 45 if (w == CERROR) { 46 status = -errno; 47 signal(SIGINT, istat); 48 signal(SIGQUIT, qstat); 49 return (status); 50 } 51 52 signal(SIGINT, istat); 53 signal(SIGQUIT, qstat); 54 status = ((status>>8)&0xFF); /* extract 8 high order bits */ 55 return (status); 56 } 57 58 /* 59 invoke shell to execute command waiting for command to terminate 60 s -> command string 61 return: 62 status -> command exit status 63 */ 64 systm(s) 65 char *s; 66 { 67 pid_t pid; 68 69 /* 70 Spawn the shell to execute command, however, since the 71 mail command runs setgid mode reset the effective group 72 id to the real group id so that the command does not 73 acquire any special privileges 74 */ 75 if ((pid = fork()) == CHILD) { 76 setuid(my_uid); 77 setgid(my_gid); 78 #ifdef SVR3 79 execl("/bin/sh", "sh", "-c", s, (char*)NULL); 80 #else 81 execl("/usr/bin/sh", "sh", "-c", s, (char*)NULL); 82 #endif 83 exit(127); 84 } 85 return (dowait(pid)); 86 } 87