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 #include <fcntl.h> 32 #include <sys/types.h> 33 #include <sys/wait.h> 34 #include <unistd.h> 35 #include <stdlib.h> 36 #include <stdio.h> 37 #include <libgen.h> 38 #include "global.h" /* pid_t, SIGTYPE, shell, and basename() */ 39 40 #define tst(a, b) (*mode == 'r'? (b) : (a)) 41 #define RDR 0 42 #define WTR 1 43 44 static pid_t popen_pid[20]; 45 static SIGTYPE (*tstat)(); 46 47 FILE * 48 mypopen(char *cmd, char *mode) 49 { 50 int p[2]; 51 pid_t *poptr; 52 int myside, yourside; 53 pid_t pid; 54 55 if (pipe(p) < 0) 56 return (NULL); 57 myside = tst(p[WTR], p[RDR]); 58 yourside = tst(p[RDR], p[WTR]); 59 if ((pid = fork()) > 0) { 60 tstat = signal(SIGTSTP, SIG_DFL); 61 } else if (pid == 0) { 62 /* myside and yourside reverse roles in child */ 63 int stdio; 64 65 /* close all pipes from other popen's */ 66 for (poptr = popen_pid; poptr < popen_pid+20; poptr++) { 67 if (*poptr) 68 (void) close(poptr - popen_pid); 69 } 70 stdio = tst(0, 1); 71 (void) close(myside); 72 (void) close(stdio); 73 (void) fcntl(yourside, F_DUPFD, stdio); 74 (void) close(yourside); 75 (void) execlp(shell, basename(shell), "-c", cmd, 0); 76 _exit(1); 77 } 78 if (pid == -1) 79 return (NULL); 80 popen_pid[myside] = pid; 81 (void) close(yourside); 82 return (fdopen(myside, mode)); 83 } 84 85 int 86 mypclose(FILE *ptr) 87 { 88 int f; 89 pid_t r; 90 int status; 91 SIGTYPE (*hstat)(), (*istat)(), (*qstat)(); 92 93 f = fileno(ptr); 94 (void) fclose(ptr); 95 istat = signal(SIGINT, SIG_IGN); 96 qstat = signal(SIGQUIT, SIG_IGN); 97 hstat = signal(SIGHUP, SIG_IGN); 98 while ((r = wait(&status)) != popen_pid[f] && r != -1) { 99 } 100 if (r == -1) 101 status = -1; 102 (void) signal(SIGINT, istat); 103 (void) signal(SIGQUIT, qstat); 104 (void) signal(SIGHUP, hstat); 105 (void) signal(SIGTSTP, tstat); 106 /* mark this pipe closed */ 107 popen_pid[f] = 0; 108 return (status); 109 } 110