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) 1988 AT&T */ 23 /* All Rights Reserved */ 24 25 26 /* 27 * Copyright (c) 1999 by Sun Microsystems, Inc. 28 * All rights reserved. 29 */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" 32 33 #include <fcntl.h> 34 #include <sys/types.h> 35 #include <sys/wait.h> 36 #include <unistd.h> 37 #include <stdlib.h> 38 #include <stdio.h> 39 #include <libgen.h> 40 #include "global.h" /* pid_t, SIGTYPE, shell, and basename() */ 41 42 #define tst(a, b) (*mode == 'r'? (b) : (a)) 43 #define RDR 0 44 #define WTR 1 45 46 static pid_t popen_pid[20]; 47 static SIGTYPE (*tstat)(); 48 49 FILE * 50 mypopen(char *cmd, char *mode) 51 { 52 int p[2]; 53 pid_t *poptr; 54 int myside, yourside; 55 pid_t pid; 56 57 if (pipe(p) < 0) 58 return (NULL); 59 myside = tst(p[WTR], p[RDR]); 60 yourside = tst(p[RDR], p[WTR]); 61 if ((pid = fork()) > 0) { 62 tstat = signal(SIGTSTP, SIG_DFL); 63 } else if (pid == 0) { 64 /* myside and yourside reverse roles in child */ 65 int stdio; 66 67 /* close all pipes from other popen's */ 68 for (poptr = popen_pid; poptr < popen_pid+20; poptr++) { 69 if (*poptr) 70 (void) close(poptr - popen_pid); 71 } 72 stdio = tst(0, 1); 73 (void) close(myside); 74 (void) close(stdio); 75 (void) fcntl(yourside, F_DUPFD, stdio); 76 (void) close(yourside); 77 (void) execlp(shell, basename(shell), "-c", cmd, 0); 78 _exit(1); 79 } 80 if (pid == -1) 81 return (NULL); 82 popen_pid[myside] = pid; 83 (void) close(yourside); 84 return (fdopen(myside, mode)); 85 } 86 87 int 88 mypclose(FILE *ptr) 89 { 90 int f; 91 pid_t r; 92 int status; 93 SIGTYPE (*hstat)(), (*istat)(), (*qstat)(); 94 95 f = fileno(ptr); 96 (void) fclose(ptr); 97 istat = signal(SIGINT, SIG_IGN); 98 qstat = signal(SIGQUIT, SIG_IGN); 99 hstat = signal(SIGHUP, SIG_IGN); 100 while ((r = wait(&status)) != popen_pid[f] && r != -1) { 101 } 102 if (r == -1) 103 status = -1; 104 (void) signal(SIGINT, istat); 105 (void) signal(SIGQUIT, qstat); 106 (void) signal(SIGHUP, hstat); 107 (void) signal(SIGTSTP, tstat); 108 /* mark this pipe closed */ 109 popen_pid[f] = 0; 110 return (status); 111 } 112