1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate *
4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate * with the License.
8*7c478bd9Sstevel@tonic-gate *
9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate *
14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate *
20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate */
22*7c478bd9Sstevel@tonic-gate /* Copyright (c) 1988 AT&T */
23*7c478bd9Sstevel@tonic-gate /* All Rights Reserved */
24*7c478bd9Sstevel@tonic-gate
25*7c478bd9Sstevel@tonic-gate
26*7c478bd9Sstevel@tonic-gate /*
27*7c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
28*7c478bd9Sstevel@tonic-gate * Use is subject to license terms.
29*7c478bd9Sstevel@tonic-gate */
30*7c478bd9Sstevel@tonic-gate
31*7c478bd9Sstevel@tonic-gate /*
32*7c478bd9Sstevel@tonic-gate * cscope - interactive C symbol cross-reference
33*7c478bd9Sstevel@tonic-gate *
34*7c478bd9Sstevel@tonic-gate * process execution functions
35*7c478bd9Sstevel@tonic-gate */
36*7c478bd9Sstevel@tonic-gate
37*7c478bd9Sstevel@tonic-gate #include "global.h"
38*7c478bd9Sstevel@tonic-gate #include <sys/types.h>
39*7c478bd9Sstevel@tonic-gate #include <sys/wait.h>
40*7c478bd9Sstevel@tonic-gate #include <stdarg.h>
41*7c478bd9Sstevel@tonic-gate #include <unistd.h>
42*7c478bd9Sstevel@tonic-gate #include <stdlib.h>
43*7c478bd9Sstevel@tonic-gate #include <stdio.h>
44*7c478bd9Sstevel@tonic-gate #include <libgen.h>
45*7c478bd9Sstevel@tonic-gate
46*7c478bd9Sstevel@tonic-gate #define getdtablesize() _NFILE
47*7c478bd9Sstevel@tonic-gate
48*7c478bd9Sstevel@tonic-gate #define MAXARGS 100 /* maximum number of arguments to executed command */
49*7c478bd9Sstevel@tonic-gate
50*7c478bd9Sstevel@tonic-gate pid_t childpid; /* child's process ID */
51*7c478bd9Sstevel@tonic-gate
52*7c478bd9Sstevel@tonic-gate static SIGTYPE (*oldsigquit)(); /* old value of quit signal */
53*7c478bd9Sstevel@tonic-gate static SIGTYPE (*oldsigtstp)(); /* old value of terminal stop signal */
54*7c478bd9Sstevel@tonic-gate
55*7c478bd9Sstevel@tonic-gate static pid_t myfork(void);
56*7c478bd9Sstevel@tonic-gate static int join(pid_t p);
57*7c478bd9Sstevel@tonic-gate
58*7c478bd9Sstevel@tonic-gate /*
59*7c478bd9Sstevel@tonic-gate * execute forks and executes a program or shell script, waits for it to
60*7c478bd9Sstevel@tonic-gate * finish, and returns its exit code.
61*7c478bd9Sstevel@tonic-gate */
62*7c478bd9Sstevel@tonic-gate
63*7c478bd9Sstevel@tonic-gate /*VARARGS0*/
64*7c478bd9Sstevel@tonic-gate int
execute(char * path,...)65*7c478bd9Sstevel@tonic-gate execute(char *path, ...)
66*7c478bd9Sstevel@tonic-gate {
67*7c478bd9Sstevel@tonic-gate va_list ap;
68*7c478bd9Sstevel@tonic-gate char *args[MAXARGS + 1];
69*7c478bd9Sstevel@tonic-gate int exitcode;
70*7c478bd9Sstevel@tonic-gate int i;
71*7c478bd9Sstevel@tonic-gate char msg[MSGLEN + 1];
72*7c478bd9Sstevel@tonic-gate pid_t p;
73*7c478bd9Sstevel@tonic-gate
74*7c478bd9Sstevel@tonic-gate /* fork and exec the program or shell script */
75*7c478bd9Sstevel@tonic-gate exitcurses();
76*7c478bd9Sstevel@tonic-gate if ((p = myfork()) == 0) {
77*7c478bd9Sstevel@tonic-gate
78*7c478bd9Sstevel@tonic-gate /* close all files except stdin, stdout, and stderr */
79*7c478bd9Sstevel@tonic-gate for (i = 3; i < getdtablesize() && close(i) == 0; ++i) {
80*7c478bd9Sstevel@tonic-gate ;
81*7c478bd9Sstevel@tonic-gate }
82*7c478bd9Sstevel@tonic-gate /* execute the program or shell script */
83*7c478bd9Sstevel@tonic-gate va_start(ap, path);
84*7c478bd9Sstevel@tonic-gate for (i = 0; i < MAXARGS &&
85*7c478bd9Sstevel@tonic-gate (args[i] = va_arg(ap, char *)) != NULL; ++i) {
86*7c478bd9Sstevel@tonic-gate }
87*7c478bd9Sstevel@tonic-gate va_end(ap);
88*7c478bd9Sstevel@tonic-gate args[i] = NULL; /* in case MAXARGS reached */
89*7c478bd9Sstevel@tonic-gate args[0] = basename(args[0]);
90*7c478bd9Sstevel@tonic-gate (void) execvp(path, args); /* returns only on failure */
91*7c478bd9Sstevel@tonic-gate (void) sprintf(msg, "\ncscope: cannot execute %s", path);
92*7c478bd9Sstevel@tonic-gate (void) perror(msg); /* display the reason */
93*7c478bd9Sstevel@tonic-gate askforreturn(); /* wait until the user sees the message */
94*7c478bd9Sstevel@tonic-gate exit(1); /* exit the child */
95*7c478bd9Sstevel@tonic-gate } else {
96*7c478bd9Sstevel@tonic-gate exitcode = join(p); /* parent */
97*7c478bd9Sstevel@tonic-gate }
98*7c478bd9Sstevel@tonic-gate if (noacttimeout) {
99*7c478bd9Sstevel@tonic-gate (void) fprintf(stderr,
100*7c478bd9Sstevel@tonic-gate "cscope: no activity time out--exiting\n");
101*7c478bd9Sstevel@tonic-gate myexit(SIGALRM);
102*7c478bd9Sstevel@tonic-gate }
103*7c478bd9Sstevel@tonic-gate entercurses();
104*7c478bd9Sstevel@tonic-gate return (exitcode);
105*7c478bd9Sstevel@tonic-gate }
106*7c478bd9Sstevel@tonic-gate
107*7c478bd9Sstevel@tonic-gate /* myfork acts like fork but also handles signals */
108*7c478bd9Sstevel@tonic-gate
109*7c478bd9Sstevel@tonic-gate static pid_t
myfork(void)110*7c478bd9Sstevel@tonic-gate myfork(void)
111*7c478bd9Sstevel@tonic-gate {
112*7c478bd9Sstevel@tonic-gate pid_t p; /* process number */
113*7c478bd9Sstevel@tonic-gate
114*7c478bd9Sstevel@tonic-gate oldsigtstp = signal(SIGTSTP, SIG_DFL);
115*7c478bd9Sstevel@tonic-gate /* the parent ignores the interrupt and quit signals */
116*7c478bd9Sstevel@tonic-gate if ((p = fork()) > 0) {
117*7c478bd9Sstevel@tonic-gate childpid = p;
118*7c478bd9Sstevel@tonic-gate oldsigquit = signal(SIGQUIT, SIG_IGN);
119*7c478bd9Sstevel@tonic-gate }
120*7c478bd9Sstevel@tonic-gate /* so they can be used to stop the child */
121*7c478bd9Sstevel@tonic-gate else if (p == 0) {
122*7c478bd9Sstevel@tonic-gate (void) signal(SIGINT, SIG_DFL);
123*7c478bd9Sstevel@tonic-gate (void) signal(SIGQUIT, SIG_DFL);
124*7c478bd9Sstevel@tonic-gate (void) signal(SIGHUP, SIG_DFL); /* restore hangup default */
125*7c478bd9Sstevel@tonic-gate }
126*7c478bd9Sstevel@tonic-gate /* check for fork failure */
127*7c478bd9Sstevel@tonic-gate if (p == -1) {
128*7c478bd9Sstevel@tonic-gate myperror("Cannot fork");
129*7c478bd9Sstevel@tonic-gate }
130*7c478bd9Sstevel@tonic-gate return (p);
131*7c478bd9Sstevel@tonic-gate }
132*7c478bd9Sstevel@tonic-gate
133*7c478bd9Sstevel@tonic-gate /* join is the compliment of fork */
134*7c478bd9Sstevel@tonic-gate
135*7c478bd9Sstevel@tonic-gate static int
join(pid_t p)136*7c478bd9Sstevel@tonic-gate join(pid_t p)
137*7c478bd9Sstevel@tonic-gate {
138*7c478bd9Sstevel@tonic-gate int status;
139*7c478bd9Sstevel@tonic-gate pid_t w;
140*7c478bd9Sstevel@tonic-gate
141*7c478bd9Sstevel@tonic-gate /* wait for the correct child to exit */
142*7c478bd9Sstevel@tonic-gate do {
143*7c478bd9Sstevel@tonic-gate w = wait(&status);
144*7c478bd9Sstevel@tonic-gate } while (p != -1 && w != p);
145*7c478bd9Sstevel@tonic-gate childpid = 0;
146*7c478bd9Sstevel@tonic-gate
147*7c478bd9Sstevel@tonic-gate /* restore signal handling */
148*7c478bd9Sstevel@tonic-gate (void) signal(SIGQUIT, oldsigquit);
149*7c478bd9Sstevel@tonic-gate (void) signal(SIGTSTP, oldsigtstp);
150*7c478bd9Sstevel@tonic-gate /* return the child's exit code */
151*7c478bd9Sstevel@tonic-gate return (status >> 8);
152*7c478bd9Sstevel@tonic-gate }
153