1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* Copyright (c) 1988 AT&T */ 23*0Sstevel@tonic-gate /* All Rights Reserved */ 24*0Sstevel@tonic-gate 25*0Sstevel@tonic-gate 26*0Sstevel@tonic-gate /* 27*0Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 28*0Sstevel@tonic-gate * Use is subject to license terms. 29*0Sstevel@tonic-gate */ 30*0Sstevel@tonic-gate 31*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 32*0Sstevel@tonic-gate 33*0Sstevel@tonic-gate /* 34*0Sstevel@tonic-gate * cscope - interactive C symbol cross-reference 35*0Sstevel@tonic-gate * 36*0Sstevel@tonic-gate * process execution functions 37*0Sstevel@tonic-gate */ 38*0Sstevel@tonic-gate 39*0Sstevel@tonic-gate #include "global.h" 40*0Sstevel@tonic-gate #include <sys/types.h> 41*0Sstevel@tonic-gate #include <sys/wait.h> 42*0Sstevel@tonic-gate #include <stdarg.h> 43*0Sstevel@tonic-gate #include <unistd.h> 44*0Sstevel@tonic-gate #include <stdlib.h> 45*0Sstevel@tonic-gate #include <stdio.h> 46*0Sstevel@tonic-gate #include <libgen.h> 47*0Sstevel@tonic-gate 48*0Sstevel@tonic-gate #define getdtablesize() _NFILE 49*0Sstevel@tonic-gate 50*0Sstevel@tonic-gate #define MAXARGS 100 /* maximum number of arguments to executed command */ 51*0Sstevel@tonic-gate 52*0Sstevel@tonic-gate pid_t childpid; /* child's process ID */ 53*0Sstevel@tonic-gate 54*0Sstevel@tonic-gate static SIGTYPE (*oldsigquit)(); /* old value of quit signal */ 55*0Sstevel@tonic-gate static SIGTYPE (*oldsigtstp)(); /* old value of terminal stop signal */ 56*0Sstevel@tonic-gate 57*0Sstevel@tonic-gate static pid_t myfork(void); 58*0Sstevel@tonic-gate static int join(pid_t p); 59*0Sstevel@tonic-gate 60*0Sstevel@tonic-gate /* 61*0Sstevel@tonic-gate * execute forks and executes a program or shell script, waits for it to 62*0Sstevel@tonic-gate * finish, and returns its exit code. 63*0Sstevel@tonic-gate */ 64*0Sstevel@tonic-gate 65*0Sstevel@tonic-gate /*VARARGS0*/ 66*0Sstevel@tonic-gate int 67*0Sstevel@tonic-gate execute(char *path, ...) 68*0Sstevel@tonic-gate { 69*0Sstevel@tonic-gate va_list ap; 70*0Sstevel@tonic-gate char *args[MAXARGS + 1]; 71*0Sstevel@tonic-gate int exitcode; 72*0Sstevel@tonic-gate int i; 73*0Sstevel@tonic-gate char msg[MSGLEN + 1]; 74*0Sstevel@tonic-gate pid_t p; 75*0Sstevel@tonic-gate 76*0Sstevel@tonic-gate /* fork and exec the program or shell script */ 77*0Sstevel@tonic-gate exitcurses(); 78*0Sstevel@tonic-gate if ((p = myfork()) == 0) { 79*0Sstevel@tonic-gate 80*0Sstevel@tonic-gate /* close all files except stdin, stdout, and stderr */ 81*0Sstevel@tonic-gate for (i = 3; i < getdtablesize() && close(i) == 0; ++i) { 82*0Sstevel@tonic-gate ; 83*0Sstevel@tonic-gate } 84*0Sstevel@tonic-gate /* execute the program or shell script */ 85*0Sstevel@tonic-gate va_start(ap, path); 86*0Sstevel@tonic-gate for (i = 0; i < MAXARGS && 87*0Sstevel@tonic-gate (args[i] = va_arg(ap, char *)) != NULL; ++i) { 88*0Sstevel@tonic-gate } 89*0Sstevel@tonic-gate va_end(ap); 90*0Sstevel@tonic-gate args[i] = NULL; /* in case MAXARGS reached */ 91*0Sstevel@tonic-gate args[0] = basename(args[0]); 92*0Sstevel@tonic-gate (void) execvp(path, args); /* returns only on failure */ 93*0Sstevel@tonic-gate (void) sprintf(msg, "\ncscope: cannot execute %s", path); 94*0Sstevel@tonic-gate (void) perror(msg); /* display the reason */ 95*0Sstevel@tonic-gate askforreturn(); /* wait until the user sees the message */ 96*0Sstevel@tonic-gate exit(1); /* exit the child */ 97*0Sstevel@tonic-gate } else { 98*0Sstevel@tonic-gate exitcode = join(p); /* parent */ 99*0Sstevel@tonic-gate } 100*0Sstevel@tonic-gate if (noacttimeout) { 101*0Sstevel@tonic-gate (void) fprintf(stderr, 102*0Sstevel@tonic-gate "cscope: no activity time out--exiting\n"); 103*0Sstevel@tonic-gate myexit(SIGALRM); 104*0Sstevel@tonic-gate } 105*0Sstevel@tonic-gate entercurses(); 106*0Sstevel@tonic-gate return (exitcode); 107*0Sstevel@tonic-gate } 108*0Sstevel@tonic-gate 109*0Sstevel@tonic-gate /* myfork acts like fork but also handles signals */ 110*0Sstevel@tonic-gate 111*0Sstevel@tonic-gate static pid_t 112*0Sstevel@tonic-gate myfork(void) 113*0Sstevel@tonic-gate { 114*0Sstevel@tonic-gate pid_t p; /* process number */ 115*0Sstevel@tonic-gate 116*0Sstevel@tonic-gate oldsigtstp = signal(SIGTSTP, SIG_DFL); 117*0Sstevel@tonic-gate /* the parent ignores the interrupt and quit signals */ 118*0Sstevel@tonic-gate if ((p = fork()) > 0) { 119*0Sstevel@tonic-gate childpid = p; 120*0Sstevel@tonic-gate oldsigquit = signal(SIGQUIT, SIG_IGN); 121*0Sstevel@tonic-gate } 122*0Sstevel@tonic-gate /* so they can be used to stop the child */ 123*0Sstevel@tonic-gate else if (p == 0) { 124*0Sstevel@tonic-gate (void) signal(SIGINT, SIG_DFL); 125*0Sstevel@tonic-gate (void) signal(SIGQUIT, SIG_DFL); 126*0Sstevel@tonic-gate (void) signal(SIGHUP, SIG_DFL); /* restore hangup default */ 127*0Sstevel@tonic-gate } 128*0Sstevel@tonic-gate /* check for fork failure */ 129*0Sstevel@tonic-gate if (p == -1) { 130*0Sstevel@tonic-gate myperror("Cannot fork"); 131*0Sstevel@tonic-gate } 132*0Sstevel@tonic-gate return (p); 133*0Sstevel@tonic-gate } 134*0Sstevel@tonic-gate 135*0Sstevel@tonic-gate /* join is the compliment of fork */ 136*0Sstevel@tonic-gate 137*0Sstevel@tonic-gate static int 138*0Sstevel@tonic-gate join(pid_t p) 139*0Sstevel@tonic-gate { 140*0Sstevel@tonic-gate int status; 141*0Sstevel@tonic-gate pid_t w; 142*0Sstevel@tonic-gate 143*0Sstevel@tonic-gate /* wait for the correct child to exit */ 144*0Sstevel@tonic-gate do { 145*0Sstevel@tonic-gate w = wait(&status); 146*0Sstevel@tonic-gate } while (p != -1 && w != p); 147*0Sstevel@tonic-gate childpid = 0; 148*0Sstevel@tonic-gate 149*0Sstevel@tonic-gate /* restore signal handling */ 150*0Sstevel@tonic-gate (void) signal(SIGQUIT, oldsigquit); 151*0Sstevel@tonic-gate (void) signal(SIGTSTP, oldsigtstp); 152*0Sstevel@tonic-gate /* return the child's exit code */ 153*0Sstevel@tonic-gate return (status >> 8); 154*0Sstevel@tonic-gate } 155