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 1996 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * University Copyright- Copyright (c) 1982, 1986, 1988 32 * The Regents of the University of California 33 * All Rights Reserved 34 * 35 * University Acknowledgment- Portions of this document are derived from 36 * software developed by the University of California, Berkeley, and its 37 * contributors. 38 */ 39 40 #include "ftp_var.h" 41 42 #ifndef sigmask 43 #define sigmask(m) (1 << ((m)-1)) 44 #endif 45 46 #define set2mask(setp) ((setp)->__sigbits[0]) 47 #define mask2set(mask, setp) \ 48 ((mask) == -1 ? sigfillset(setp) : (((setp)->__sigbits[0]) = (mask))) 49 50 51 static int 52 sigsetmask(int mask) 53 { 54 sigset_t oset; 55 sigset_t nset; 56 57 (void) sigprocmask(0, (sigset_t *)0, &nset); 58 mask2set(mask, &nset); 59 (void) sigprocmask(SIG_SETMASK, &nset, &oset); 60 return (set2mask(&oset)); 61 } 62 63 static int 64 sigblock(int mask) 65 { 66 sigset_t oset; 67 sigset_t nset; 68 69 (void) sigprocmask(0, (sigset_t *)0, &nset); 70 mask2set(mask, &nset); 71 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 72 return (set2mask(&oset)); 73 } 74 75 #define signal(s, f) sigset(s, f) 76 77 #define tst(a, b) (*mode == 'r'? (b) : (a)) 78 #define RDR 0 79 #define WTR 1 80 #define NOFILES 20 /* just in case */ 81 82 static pid_t *popen_pid; 83 static rlim_t nfiles = 0; 84 85 FILE * 86 mypopen(char *cmd, char *mode) 87 { 88 int p[2]; 89 pid_t pid; 90 int myside, remside, i; 91 struct rlimit rl; 92 93 if (nfiles <= 0) { 94 if (getrlimit(RLIMIT_NOFILE, &rl) == 0) 95 nfiles = rl.rlim_max; 96 else 97 nfiles = NOFILES; 98 } 99 if (popen_pid == NULL) { 100 popen_pid = (pid_t *)malloc((unsigned)nfiles * 101 sizeof (*popen_pid)); 102 if (popen_pid == NULL) 103 return (NULL); 104 for (i = 0; i < nfiles; i++) 105 popen_pid[i] = (pid_t)-1; 106 } 107 if (pipe(p) < 0) 108 return (NULL); 109 myside = tst(p[WTR], p[RDR]); 110 remside = tst(p[RDR], p[WTR]); 111 if ((pid = vfork()) == 0) { 112 /* myside and remside reverse roles in child */ 113 (void) close(myside); 114 if (remside != tst(0, 1)) { 115 (void) dup2(remside, tst(0, 1)); 116 (void) close(remside); 117 } 118 execl("/bin/sh", "sh", "-c", cmd, (char *)NULL); 119 _exit(127); 120 } 121 if (pid == (pid_t)-1) { 122 (void) close(myside); 123 (void) close(remside); 124 return (NULL); 125 } 126 popen_pid[myside] = pid; 127 (void) close(remside); 128 return (fdopen(myside, mode)); 129 } 130 131 /*ARGSUSED*/ 132 static void 133 pabort(int sig) 134 { 135 extern int mflag; 136 137 mflag = 0; 138 } 139 140 int 141 mypclose(FILE *ptr) 142 { 143 pid_t child, pid; 144 int omask; 145 void (*istat)(); 146 int status; 147 148 child = popen_pid[fileno(ptr)]; 149 popen_pid[fileno(ptr)] = (pid_t)-1; 150 (void) fclose(ptr); 151 if (child == (pid_t)-1) 152 return (-1); 153 istat = signal(SIGINT, pabort); 154 omask = sigblock(sigmask(SIGQUIT)|sigmask(SIGHUP)); 155 while ((pid = wait(&status)) != child && pid != (pid_t)-1) 156 ; 157 (void) sigsetmask(omask); 158 (void) signal(SIGINT, istat); 159 return (pid == (pid_t)-1 ? -1 : 0); 160 } 161