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Fix calls to mmap. It returns void *, and on failure it returns

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MAP_FAILED.

Don't try to extend the mapping in place if it is too short.
There's no guarantee it will be possible.  Remap the file instead.

Put in a few style fixes.

Submitted by:	Bruce Evans <bde>
This commit is contained in:
jdp 1998-09-06 20:43:25 +00:00
parent e08529ca69
commit 705eaef8b8
1 changed files with 11 additions and 11 deletions
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22
sbin/ldconfig/ldconfig.c
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@ -30,7 +30,7 @@
#ifndef lint
static const char rcsid[] =
"$Id: ldconfig.c,v 1.25 1998/09/05 03:30:54 jdp Exp $";
"$Id: ldconfig.c,v 1.26 1998/09/05 16:20:15 jdp Exp $";
#endif /* not lint */
#include <sys/param.h>
@ -169,12 +169,10 @@ char *argv[];
if (stat(argv[i], &stbuf) == -1) {
warn("%s", argv[i]);
rval = -1;
}
else if (!strcmp(argv[i], "/usr/lib")) {
} else if (strcmp(argv[i], "/usr/lib") == 0) {
warnx("WARNING! '%s' can not be used", argv[i]);
rval = -1;
}
else {
} else {
/*
* See if this is a directory-containing
* file instead of a directory
@ -573,7 +571,8 @@ static int
readhints()
{
int fd;
caddr_t addr;
void *addr;
long fsize;
long msize;
struct hints_header *hdr;
struct hints_bucket *blist;
@ -589,7 +588,7 @@ readhints()
msize = PAGE_SIZE;
addr = mmap(0, msize, PROT_READ, MAP_COPY, fd, 0);
if (addr == (caddr_t)-1) {
if (addr == MAP_FAILED) {
warn("%s", hints_file);
return -1;
}
@ -608,13 +607,14 @@ readhints()
}
if (hdr->hh_ehints > msize) {
if (mmap(addr+msize, hdr->hh_ehints - msize,
PROT_READ, MAP_COPY|MAP_FIXED,
fd, msize) != (caddr_t)(addr+msize)) {
fsize = hdr->hh_ehints;
munmap(addr, msize);
addr = mmap(0, fsize, PROT_READ, MAP_COPY, fd, 0);
if (addr == MAP_FAILED) {
warn("%s", hints_file);
return -1;
}
hdr = (struct hints_header *)addr;
}
close(fd);