192 lines
5.5 KiB
C
192 lines
5.5 KiB
C
/*
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* Copyright (c) 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the rights
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* to redistribute these changes.
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*/
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/* run, runv, runp, runvp -- execute process and wait for it to exit
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*
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* Usage:
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* i = run (file, arg1, arg2, ..., argn, 0);
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* i = runv (file, arglist);
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* i = runp (file, arg1, arg2, ..., argn, 0);
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* i = runvp (file, arglist);
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*
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* Run, runv, runp and runvp have argument lists exactly like the
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* corresponding routines, execl, execv, execlp, execvp. The run
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* routines perform a fork, then:
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* IN THE NEW PROCESS, an execl[p] or execv[p] is performed with the
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* specified arguments. The process returns with a -1 code if the
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* exec was not successful.
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* IN THE PARENT PROCESS, the signals SIGQUIT and SIGINT are disabled,
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* the process waits until the newly forked process exits, the
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* signals are restored to their original status, and the return
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* status of the process is analyzed.
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* All run routines return: -1 if the exec failed or if the child was
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* terminated abnormally; otherwise, the exit code of the child is
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* returned.
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*
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**********************************************************************
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* HISTORY
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* $Log: run.c,v $
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* Revision 1.1.1.1 1995/12/26 04:54:47 peter
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* Import the unmodified version of the sup that we are using.
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* The heritage of this version is not clear. It appears to be NetBSD
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* derived from some time ago.
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*
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* Revision 1.1.1.1 1993/08/21 00:46:33 jkh
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* Current sup with compression support.
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*
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* Revision 1.1.1.1 1993/05/21 14:52:17 cgd
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* initial import of CMU's SUP to NetBSD
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*
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* Revision 1.1 89/10/14 19:53:39 rvb
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* Initial revision
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*
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* Revision 1.2 89/08/03 14:36:46 mja
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* Update run() and runp() to use <varargs.h>.
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* [89/04/19 mja]
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*
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* 23-Sep-86 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Merged old runv and runvp modules.
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*
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* 22-Nov-85 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Added check and kill if child process was stopped.
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*
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* 30-Apr-85 Steven Shafer (sas) at Carnegie-Mellon University
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* Adapted for 4.2 BSD UNIX: Conforms to new signals and wait.
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*
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* 15-July-82 Mike Accetta (mja) and Neal Friedman (naf)
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* at Carnegie-Mellon University
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* Added a return(-1) if vfork fails. This should only happen
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* if there are no more processes available.
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*
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* 28-Jan-80 Steven Shafer (sas) at Carnegie-Mellon University
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* Added setuid and setgid for system programs' use.
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*
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* 21-Jan-80 Steven Shafer (sas) at Carnegie-Mellon University
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* Changed fork to vfork.
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*
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* 20-Nov-79 Steven Shafer (sas) at Carnegie-Mellon University
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* Created for VAX. The proper way to fork-and-execute a system
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* program is now by "runvp" or "runp", with the program name
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* (rather than an absolute pathname) as the first argument;
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* that way, the "PATH" variable in the environment does the right
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* thing. Too bad execvp and execlp (hence runvp and runp) don't
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* accept a pathlist as an explicit argument.
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*
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**********************************************************************
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*/
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#include <stdio.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <varargs.h>
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#define MAXARGS 100
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static int dorun();
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int run (name,va_alist)
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char *name;
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va_dcl
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{
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int val;
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va_list ap;
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va_start(ap);
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val = runv (name,ap);
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va_end(ap);
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return(val);
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}
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int runv (name,argv)
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char *name,**argv;
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{
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return (dorun (name, argv, 0));
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}
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int runp (name,va_alist)
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char *name;
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va_dcl
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{
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int val;
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va_list ap;
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char *args[MAXARGS];
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int argno=0;
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va_start(ap);
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while (argno < MAXARGS
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&& (args[argno++] = va_arg(ap, char *)) != (char *)0);
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va_end(ap);
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val = runvp (name,args);
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return (val);
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}
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int runvp (name,argv)
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char *name,**argv;
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{
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return (dorun (name, argv, 1));
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}
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static
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int dorun (name,argv,usepath)
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char *name,**argv;
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int usepath;
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{
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int wpid;
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register int pid;
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struct sigvec ignoresig,intsig,quitsig;
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union wait status;
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int execvp(), execv();
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int (*execrtn)() = usepath ? execvp : execv;
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if ((pid = vfork()) == -1)
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return(-1); /* no more process's, so exit with error */
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if (pid == 0) { /* child process */
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setgid (getgid());
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setuid (getuid());
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(*execrtn) (name,argv);
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fprintf (stderr,"run: can't exec %s\n",name);
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_exit (0377);
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}
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ignoresig.sv_handler = SIG_IGN; /* ignore INT and QUIT signals */
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ignoresig.sv_mask = 0;
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ignoresig.sv_onstack = 0;
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sigvec (SIGINT,&ignoresig,&intsig);
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sigvec (SIGQUIT,&ignoresig,&quitsig);
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do {
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wpid = wait3 (&status.w_status, WUNTRACED, 0);
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if (WIFSTOPPED (status)) {
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kill (0,SIGTSTP);
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wpid = 0;
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}
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} while (wpid != pid && wpid != -1);
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sigvec (SIGINT,&intsig,0); /* restore signals */
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sigvec (SIGQUIT,&quitsig,0);
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if (WIFSIGNALED (status) || status.w_retcode == 0377)
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return (-1);
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return (status.w_retcode);
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}
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