/*=========================================================================== Copyright (c) 1998-2000, The Santa Cruz Operation All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: *Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. *Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. *Neither name of The Santa Cruz Operation nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. =========================================================================*/ /* cscope - interactive C symbol cross-reference * * process execution functions */ #include #include "global.h" #include #include #include /* pid_t */ #ifdef __DJGPP__ #include #endif #if defined(USE_NCURSES) && !defined(RENAMED_NCURSES) #include #else #include #endif static char const rcsid[] = "$Id: exec.c,v 1.12 2009/04/10 13:39:23 broeker Exp $"; static sighandler_t oldsigquit; /* old value of quit signal */ static sighandler_t oldsighup; /* old value of hangup signal */ static sighandler_t oldsigtstp; /* old value of SIGTSTP */ #ifndef __MSDOS__ /* none of these is needed, there */ static int join(pid_t p); static int myexecvp(char *a, char **args); static pid_t myfork(void); #endif /* execute forks and executes a program or shell script, waits for it to * finish, and returns its exit code. */ /*VARARGS1*/ int execute(char *a, ...) /* note: "exec" is already defined on u370 */ { va_list ap; int exitcode = -1; /* initialize, to avoid warning */ char *argv[BUFSIZ]; pid_t p; /* fork and exec the program or shell script */ endwin(); /* restore the terminal modes */ mousecleanup(); fflush(stdout); va_start(ap, a); for (p = 0; (argv[p] = va_arg(ap, char *)) != 0; p++) ; #ifdef __MSDOS__ /* HBB 20010313: in MSDOG, everything is completely different. * No fork()/exec()/wait(), but rather a single libc call: */ exitcode = spawnvp(P_WAIT, a, argv); #else if ((p = myfork()) == 0) { myexecvp(a, argv); /* child */ } else { exitcode = join(p); /* parent */ } #endif /* MSDOS */ /* the menu and scrollbar may be changed by the command executed */ #if UNIXPC || !TERMINFO # ifndef __DJGPP__ /* leave CRLF handling as is */ nonl(); # endif raw(); /* endwin() turns off cbreak mode so restore it */ noecho(); #endif mousemenu(); drawscrollbar(topline, nextline); va_end(ap); return(exitcode); } #ifndef __MSDOS__ /* None of the following functions is used there */ /* myexecvp is an interface to the execvp system call to * modify argv[0] to reference the last component of its path-name. */ static int myexecvp(char *a, char **args) { char msg[MSGLEN + 1]; /* modify argv[0] to reference the last component of its path name */ args[0] = mybasename(args[0]); /* execute the program or shell script */ execvp(a, args); /* returns only on failure */ snprintf(msg, sizeof(msg), "\nCannot exec %s", a); perror(msg); /* display the reason */ askforreturn(); /* wait until the user sees the message */ myexit(1); /* exit the child */ /* NOTREACHED */ } /* myfork acts like fork but also handles signals */ static pid_t myfork(void) { pid_t p; /* process number */ p = fork(); /* the parent ignores the interrupt, quit, and hangup signals */ if (p > 0) { oldsigquit = signal(SIGQUIT, SIG_IGN); oldsighup = signal(SIGHUP, SIG_IGN); #ifdef SIGTSTP oldsigtstp = signal(SIGTSTP, SIG_DFL); #endif } /* so they can be used to stop the child */ else if (p == 0) { signal(SIGINT, SIG_DFL); signal(SIGQUIT, SIG_DFL); signal(SIGHUP, SIG_DFL); #ifdef SIGTSTP signal(SIGTSTP, SIG_DFL); #endif } /* check for fork failure */ if (p == -1) { myperror("Cannot fork"); } return p; } /* join is the compliment of fork */ static int join(pid_t p) { int status; pid_t w; /* wait for the correct child to exit */ do { w = wait(&status); } while (p != -1 && w != p); /* restore signal handling */ signal(SIGQUIT, oldsigquit); signal(SIGHUP, oldsighup); #ifdef SIGTSTP signal(SIGTSTP, oldsigtstp); #endif /* return the child's exit code */ return(status >> 8); } #endif /* !MSDOS */ v Petkov <bp@alien8.de> Tested-by: Borislav Petkov <bp@suse.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: jroedel@suse.de Cc: suravee.suthikulpanit@amd.com Link: http://lkml.kernel.org/r/20160423224255.GB3430@twins.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
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