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) 1984, 1986, 1987, 1988, 1989 AT&T */ 23 /* All Rights Reserved */ 24 25 26 /* 27 * University Copyright- Copyright (c) 1982, 1986, 1988 28 * The Regents of the University of California 29 * All Rights Reserved 30 * 31 * University Acknowledgment- Portions of this document are derived from 32 * software developed by the University of California, Berkeley, and its 33 * contributors. 34 */ 35 36 #pragma ident "%Z%%M% %I% %E% SMI" 37 38 /* 39 * mailx -- a modified version of a University of California at Berkeley 40 * mail program 41 * 42 * npopen() and npclose() 43 * 44 * stolen from C library, modified to use SHELL variable 45 */ 46 47 48 #include <stdio.h> 49 #include <signal.h> 50 #include <fcntl.h> 51 52 #define tst(a,b) (*mode == 'r'? (b) : (a)) 53 #define RDR 0 54 #define WTR 1 55 56 #ifdef VMUNIX 57 #define sigset signal 58 #else 59 extern void (*sigset())(); 60 #endif 61 #ifdef preSVr4 62 extern FILE *fdopen(); 63 extern int execlp(), fork(), pipe(), close(), fcntl(); 64 #ifndef sun 65 typedef int pid_t; 66 #endif 67 #else 68 # include <unistd.h> 69 # include <wait.h> 70 #endif 71 static pid_t popen_pid[20]; 72 73 FILE * 74 npopen(char *cmd, char *mode) 75 { 76 int p[2]; 77 register pid_t pid; 78 register int myside, yourside; 79 char *Shell, *value(char *); 80 81 if ((Shell = value("SHELL")) == NULL || *Shell=='\0') 82 #ifdef preSVr4 83 Shell = "/bin/sh"; 84 #else 85 Shell = "/usr/bin/sh"; 86 #endif 87 if(pipe(p) < 0) 88 return(NULL); 89 myside = tst(p[WTR], p[RDR]); 90 yourside = tst(p[RDR], p[WTR]); 91 if((pid = fork()) == 0) { 92 /* myside and yourside reverse roles in child */ 93 int stdio; 94 95 stdio = tst(0, 1); 96 (void) close(myside); 97 (void) close(stdio); 98 (void) fcntl(yourside, 0, stdio); 99 (void) close(yourside); 100 (void) execlp(Shell, Shell, "-c", cmd, (char *)0); 101 perror(Shell); 102 _exit(1); 103 } 104 if(pid == (pid_t)-1) 105 return(NULL); 106 popen_pid[myside] = pid; 107 (void) close(yourside); 108 return(fdopen(myside, mode)); 109 } 110 111 int 112 npclose(FILE *ptr) 113 { 114 register int f; 115 register pid_t r; 116 int status; 117 void (*istat)(int), (*qstat)(int); 118 119 f = fileno(ptr); 120 (void) fclose(ptr); 121 istat = sigset(SIGINT, SIG_IGN); 122 qstat = sigset(SIGQUIT, SIG_IGN); 123 while((r = wait(&status)) != popen_pid[f] && r != (pid_t)-1) 124 ; 125 if(r == (pid_t)-1) 126 status = -1; 127 (void) sigset(SIGINT, istat); 128 (void) sigset(SIGQUIT, qstat); 129 return(status); 130 } 131