/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ /* All Rights Reserved */ #pragma ident "%Z%%M% %I% %E% SMI" /* * These routines are based on the standard UNIX stdio popen/pclose * routines. This version takes an argv[][] argument instead of a string * to be passed to the shell. The routine execvp() is used to call the * program, hence the name popenvp() and the argument types. * * This routine avoids an extra shell completely, along with not having * to worry about quoting conventions in strings that have spaces, * quotes, etc. */ #include <sys/types.h> #include <assert.h> #include <string.h> #include "libmail.h" #include <sys/wait.h> #include <stdio.h> #include <fcntl.h> #include <signal.h> #include <errno.h> #define tst(a, b) (*mode == 'r'? (b) : (a)) #define RDR 0 #define WTR 1 #include <unistd.h> static pid_t popen_pid[20]; /* Functions calling popenvp() should ensure 'file' is non-NULL */ FILE * popenvp(char *file, char **argv, char *mode, int resetid) { int p[2]; int myside, yourside; pid_t pid; assert(file != NULL); if (pipe(p) < 0) return (NULL); myside = tst(p[WTR], p[RDR]); yourside = tst(p[RDR], p[WTR]); if ((pid = fork()) == 0) { /* myside and yourside reverse roles in child */ int stdio; if (resetid) { (void) setgid(getgid()); (void) setuid(getuid()); } stdio = tst(0, 1); (void) close(myside); (void) close(stdio); (void) fcntl(yourside, F_DUPFD, stdio); (void) close(yourside); (void) execvp(file, argv); (void) fprintf(stderr, "exec of \"%s\" failed: %s\n", file, strerror(errno)); (void) fflush(stderr); _exit(1); } if (pid == (pid_t)-1) return (NULL); popen_pid[myside] = pid; (void) close(yourside); return (fdopen(myside, mode)); } int pclosevp(FILE *ptr) { int f; pid_t r; int status; void (*hstat)(int), (*istat)(int), (*qstat)(int); f = fileno(ptr); (void) fclose(ptr); istat = signal(SIGINT, SIG_IGN); qstat = signal(SIGQUIT, SIG_IGN); hstat = signal(SIGHUP, SIG_IGN); do { r = wait(&status); } while (r != popen_pid[f] && r != (pid_t)-1); if (r == (pid_t)-1) status = -1; (void) signal(SIGINT, istat); (void) signal(SIGQUIT, qstat); (void) signal(SIGHUP, hstat); return (status); }