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