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In lieu of a good way to prevent every possible looping in make(1), stop

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there from being more than 500 processes forked by make(1), to prevent a
forkbomb from happening, in a dumb and mechanical way.

PR:		alane
Submitted by:	bin/42772
MFC after:	2 weeks
This commit is contained in:
jmallett 2002-10-03 04:32:47 +00:00
parent 4e57a787f2
commit a36c23beb5
1 changed files with 21 additions and 0 deletions
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21
usr.bin/make/main.c
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@ -102,6 +102,8 @@ __FBSDID("$FreeBSD$");
#include "job.h"
#include "pathnames.h"
#define WANT_ENV_MKLVL 1
#ifndef DEFMAXLOCAL
#define DEFMAXLOCAL DEFMAXJOBS
#endif /* DEFMAXLOCAL */
@ -454,6 +456,12 @@ main(argc, argv)
Boolean outOfDate = TRUE; /* FALSE if all targets up to date */
struct stat sa;
char *p, *p1, *path, *pathp;
#ifdef WANT_ENV_MKLVL
#define MKLVL_MAXVAL 500
#define MKLVL_ENVVAR "__MKLVL__"
int iMkLvl = 0;
char *szMkLvl = getenv(MKLVL_ENVVAR);
#endif /* WANT_ENV_MKLVL */
char mdpath[MAXPATHLEN];
char obpath[MAXPATHLEN];
char cdpath[MAXPATHLEN];
@ -465,6 +473,19 @@ main(argc, argv)
/* avoid faults on read-only strings */
static char syspath[] = _PATH_DEFSYSPATH;
#ifdef WANT_ENV_MKLVL
if ((iMkLvl = szMkLvl ? atoi(szMkLvl) : 0) < 0) {
iMkLvl = 0;
}
if (iMkLvl++ > MKLVL_MAXVAL) {
errc(2, EAGAIN,
"Max recursion level (%d) exceeded.", MKLVL_MAXVAL);
}
bzero(szMkLvl = emalloc(32), 32);
sprintf(szMkLvl, "%d", iMkLvl);
setenv(MKLVL_ENVVAR, szMkLvl, 1);
#endif /* WANT_ENV_MKLVL */
#if DEFSHELL == 2
/*
* Turn off ENV to make ksh happier.