191 lines
5.3 KiB
C
191 lines
5.3 KiB
C
/*===========================================================================
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Copyright (c) 1998-2000, The Santa Cruz Operation
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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*Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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*Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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*Neither name of The Santa Cruz Operation nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
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IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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DAMAGE.
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=========================================================================*/
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/* cscope - interactive C symbol cross-reference
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*
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* process execution functions
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*/
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#include <unistd.h>
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#include "global.h"
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#include <stdarg.h>
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#include <sys/wait.h>
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#include <sys/types.h> /* pid_t */
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#ifdef __DJGPP__
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#include <process.h>
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#endif
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#if defined(USE_NCURSES) && !defined(RENAMED_NCURSES)
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#include <ncurses.h>
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#else
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#include <curses.h>
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#endif
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static char const rcsid[] = "$Id: exec.c,v 1.12 2009/04/10 13:39:23 broeker Exp $";
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static sighandler_t oldsigquit; /* old value of quit signal */
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static sighandler_t oldsighup; /* old value of hangup signal */
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static sighandler_t oldsigtstp; /* old value of SIGTSTP */
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#ifndef __MSDOS__ /* none of these is needed, there */
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static int join(pid_t p);
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static int myexecvp(char *a, char **args);
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static pid_t myfork(void);
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#endif
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/* execute forks and executes a program or shell script, waits for it to
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* finish, and returns its exit code.
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*/
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/*VARARGS1*/
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int
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execute(char *a, ...) /* note: "exec" is already defined on u370 */
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{
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va_list ap;
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int exitcode = -1; /* initialize, to avoid warning */
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char *argv[BUFSIZ];
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pid_t p;
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/* fork and exec the program or shell script */
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endwin(); /* restore the terminal modes */
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mousecleanup();
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fflush(stdout);
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va_start(ap, a);
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for (p = 0; (argv[p] = va_arg(ap, char *)) != 0; p++)
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;
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#ifdef __MSDOS__
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/* HBB 20010313: in MSDOG, everything is completely different.
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* No fork()/exec()/wait(), but rather a single libc call: */
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exitcode = spawnvp(P_WAIT, a, argv);
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#else
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if ((p = myfork()) == 0) {
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myexecvp(a, argv); /* child */
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}
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else {
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exitcode = join(p); /* parent */
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}
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#endif /* MSDOS */
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/* the menu and scrollbar may be changed by the command executed */
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#if UNIXPC || !TERMINFO
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# ifndef __DJGPP__ /* leave CRLF handling as is */
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nonl();
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# endif
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raw(); /* endwin() turns off cbreak mode so restore it */
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noecho();
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#endif
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mousemenu();
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drawscrollbar(topline, nextline);
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va_end(ap);
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return(exitcode);
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}
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#ifndef __MSDOS__ /* None of the following functions is used there */
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/* myexecvp is an interface to the execvp system call to
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* modify argv[0] to reference the last component of its path-name.
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*/
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static int
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myexecvp(char *a, char **args)
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{
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char msg[MSGLEN + 1];
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/* modify argv[0] to reference the last component of its path name */
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args[0] = mybasename(args[0]);
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/* execute the program or shell script */
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execvp(a, args); /* returns only on failure */
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snprintf(msg, sizeof(msg), "\nCannot exec %s", a);
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perror(msg); /* display the reason */
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askforreturn(); /* wait until the user sees the message */
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myexit(1); /* exit the child */
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/* NOTREACHED */
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}
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/* myfork acts like fork but also handles signals */
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static pid_t
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myfork(void)
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{
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pid_t p; /* process number */
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p = fork();
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/* the parent ignores the interrupt, quit, and hangup signals */
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if (p > 0) {
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oldsigquit = signal(SIGQUIT, SIG_IGN);
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oldsighup = signal(SIGHUP, SIG_IGN);
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#ifdef SIGTSTP
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oldsigtstp = signal(SIGTSTP, SIG_DFL);
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#endif
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}
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/* so they can be used to stop the child */
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else if (p == 0) {
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signal(SIGINT, SIG_DFL);
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signal(SIGQUIT, SIG_DFL);
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signal(SIGHUP, SIG_DFL);
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#ifdef SIGTSTP
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signal(SIGTSTP, SIG_DFL);
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#endif
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}
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/* check for fork failure */
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if (p == -1) {
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myperror("Cannot fork");
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}
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return p;
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}
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/* join is the compliment of fork */
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static int
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join(pid_t p)
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{
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int status;
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pid_t w;
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/* wait for the correct child to exit */
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do {
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w = wait(&status);
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} while (p != -1 && w != p);
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/* restore signal handling */
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signal(SIGQUIT, oldsigquit);
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signal(SIGHUP, oldsighup);
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#ifdef SIGTSTP
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signal(SIGTSTP, oldsigtstp);
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#endif
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/* return the child's exit code */
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return(status >> 8);
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}
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#endif /* !MSDOS */
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