Xref: utzoo comp.unix.questions:9122 comp.lang.c:12388
Path: utzoo!attcan!uunet!mcvax!ukc!stc!john
From: john@tcom.stc.co.uk (John Blair)
Newsgroups: comp.unix.questions,comp.lang.c
Subject: General Unix/C question
Keywords: userid Make su segmentation core
Message-ID: <641@jura.tcom.stc.co.uk>
Date: 2 Sep 88 14:23:00 GMT
Organization: STC Telecomms, Harlow Technical Centre, Harlow. ESSEX
Lines: 20


Below is the program I use to run a unix command under the userid of the
program owner.
However when the command passed is Make with parameters and 
stdout and stderr file redirection I sometimes get segmentation
problems and core dumped.

If I "su" as the userid of the program owner
and execute the same Make command I do not get segmentation problems.
What is wrong with the C program?

/* note, this must run with set uid on execution */
main(argc,argv)
 int argc;
 char * argv[];
{
 setuid(geteuid());
 setgid(getegid());
 execvp(argv[1],argv+1);
}