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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * These routines are based on the standard UNIX stdio popen/pclose 34 * routines. This version takes an argv[][] argument instead of a string 35 * to be passed to the shell. The routine execvp() is used to call the 36 * program, hence the name popenvp() and the argument types. 37 * 38 * This routine avoids an extra shell completely, along with not having 39 * to worry about quoting conventions in strings that have spaces, 40 * quotes, etc. 41 */ 42 43 #include <sys/types.h> 44 #include <assert.h> 45 #include <string.h> 46 #include "libmail.h" 47 #include <sys/wait.h> 48 #include <stdio.h> 49 #include <fcntl.h> 50 #include <signal.h> 51 #include <errno.h> 52 53 #define tst(a, b) (*mode == 'r'? (b) : (a)) 54 #define RDR 0 55 #define WTR 1 56 57 #include <unistd.h> 58 static pid_t popen_pid[20]; 59 60 /* Functions calling popenvp() should ensure 'file' is non-NULL */ 61 62 FILE * 63 popenvp(char *file, char **argv, char *mode, int resetid) 64 { 65 int p[2]; 66 int myside, yourside; 67 pid_t pid; 68 69 assert(file != NULL); 70 if (pipe(p) < 0) 71 return (NULL); 72 myside = tst(p[WTR], p[RDR]); 73 yourside = tst(p[RDR], p[WTR]); 74 if ((pid = fork()) == 0) { 75 /* myside and yourside reverse roles in child */ 76 int stdio; 77 78 if (resetid) { 79 (void) setgid(getgid()); 80 (void) setuid(getuid()); 81 } 82 stdio = tst(0, 1); 83 (void) close(myside); 84 (void) close(stdio); 85 (void) fcntl(yourside, F_DUPFD, stdio); 86 (void) close(yourside); 87 (void) execvp(file, argv); 88 (void) fprintf(stderr, "exec of \"%s\" failed: %s\n", 89 file, strerror(errno)); 90 (void) fflush(stderr); 91 _exit(1); 92 } 93 if (pid == (pid_t)-1) 94 return (NULL); 95 popen_pid[myside] = pid; 96 (void) close(yourside); 97 return (fdopen(myside, mode)); 98 } 99 100 int 101 pclosevp(FILE *ptr) 102 { 103 int f; 104 pid_t r; 105 int status; 106 void (*hstat)(int), (*istat)(int), (*qstat)(int); 107 108 f = fileno(ptr); 109 (void) fclose(ptr); 110 istat = signal(SIGINT, SIG_IGN); 111 qstat = signal(SIGQUIT, SIG_IGN); 112 hstat = signal(SIGHUP, SIG_IGN); 113 do { 114 r = wait(&status); 115 } while (r != popen_pid[f] && r != (pid_t)-1); 116 117 if (r == (pid_t)-1) 118 status = -1; 119 (void) signal(SIGINT, istat); 120 (void) signal(SIGQUIT, qstat); 121 (void) signal(SIGHUP, hstat); 122 return (status); 123 } 124