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 (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 24 /* All Rights Reserved */ 25 26 /* 27 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" 32 /*LINTLIBRARY*/ 33 34 /* 35 * These routines are based on the standard UNIX stdio popen/pclose 36 * routines. This version takes an argv[][] argument instead of a string 37 * to be passed to the shell. The routine execvp() is used to call the 38 * program, hence the name popenvp() and the argument types. 39 * 40 * This routine avoids an extra shell completely, along with not having 41 * to worry about quoting conventions in strings that have spaces, 42 * quotes, etc. 43 */ 44 45 #include "c_synonyms.h" 46 #include <sys/types.h> 47 #include <assert.h> 48 #include <string.h> 49 #include "libmail.h" 50 #include <sys/wait.h> 51 #include <stdio.h> 52 #include <fcntl.h> 53 #include <signal.h> 54 #include <errno.h> 55 56 #define tst(a, b) (*mode == 'r'? (b) : (a)) 57 #define RDR 0 58 #define WTR 1 59 60 #include <unistd.h> 61 static pid_t popen_pid[20]; 62 63 /* Functions calling popenvp() should ensure 'file' is non-NULL */ 64 65 FILE * 66 popenvp(char *file, char **argv, char *mode, int resetid) 67 { 68 int p[2]; 69 int myside, yourside; 70 pid_t pid; 71 72 assert(file != NULL); 73 if (pipe(p) < 0) 74 return (NULL); 75 myside = tst(p[WTR], p[RDR]); 76 yourside = tst(p[RDR], p[WTR]); 77 if ((pid = fork()) == 0) { 78 /* myside and yourside reverse roles in child */ 79 int stdio; 80 81 if (resetid) { 82 (void) setgid(getgid()); 83 (void) setuid(getuid()); 84 } 85 stdio = tst(0, 1); 86 (void) close(myside); 87 (void) close(stdio); 88 (void) fcntl(yourside, F_DUPFD, stdio); 89 (void) close(yourside); 90 (void) execvp(file, argv); 91 (void) fprintf(stderr, "exec of \"%s\" failed: %s\n", 92 file, strerror(errno)); 93 (void) fflush(stderr); 94 _exit(1); 95 } 96 if (pid == (pid_t)-1) 97 return (NULL); 98 popen_pid[myside] = pid; 99 (void) close(yourside); 100 return (fdopen(myside, mode)); 101 } 102 103 int 104 pclosevp(FILE *ptr) 105 { 106 int f; 107 pid_t r; 108 int status; 109 void (*hstat)(int), (*istat)(int), (*qstat)(int); 110 111 f = fileno(ptr); 112 (void) fclose(ptr); 113 istat = signal(SIGINT, SIG_IGN); 114 qstat = signal(SIGQUIT, SIG_IGN); 115 hstat = signal(SIGHUP, SIG_IGN); 116 do 117 r = wait(&status); 118 while (r != popen_pid[f] && r != (pid_t)-1); 119 120 if (r == (pid_t)-1) 121 status = -1; 122 (void) signal(SIGINT, istat); 123 (void) signal(SIGQUIT, qstat); 124 (void) signal(SIGHUP, hstat); 125 return (status); 126 } 127