Date: Thu, 12 Dec 2002 19:20:15 -0500 From: Brian Fundakowski Feldman <green@freeBSD.org> To: current@freeBSD.org Subject: fincore.c strikes again (panic bremfree: bp not locked) Message-ID: <200212130020.gBD0KFWg000827@green.bikeshed.org>
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I don't have any more info since for some reason the kernel wasn't saved
when my system dumped core, but yet again fincore.c causes evidence that
-CURRENT has regressed again. I can't find the old thread I'm thinking of,
but from a slightly different thread, bde knew what was going on. For
further reference:
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <machine/param.h>
#include <errno.h>
/*
** print pages of file in core
*/
void usage(char *name)
{
printf("Usage: %s [-ns] files...\n",name);
printf("\t-n\t\tDo not print filename\n");
printf("\t-o\t\tOnly print files with at least one page in core\n");
printf("\t-s\t\tDo not print file size in pages\n");
}
main(int ac,char **av)
{
int c;
int print_name = 1;
int print_sizepages = 1;
int only_nonzero = 0;
int status = 0;
while((c = getopt(ac,av,"nos")) != -1) {
switch(c) {
case 'n':
print_name = 0;
break;
case 'o':
only_nonzero = 1;
break;
case 's':
print_sizepages = 0;
break;
default:
usage(av[0]);
exit(1);
}
}
for(; optind < ac ; optind++) {
int fd;
int pind,pcount;
caddr_t addr;
struct stat statbuf;
size_t len;
size_t numpages;
char *pvec;
if (stat(av[optind],&statbuf)) {
perror("stat");
status = 1;
continue;
}
if (!S_ISREG(statbuf.st_mode)) {
close(fd);
continue;
}
if ((fd = open(av[optind],O_RDONLY)) < 0) {
perror(av[optind]);
status = 1;
continue;
}
if (fstat(fd,&statbuf)) {
perror("fstat");
close(fd);
status = 1;
continue;
}
if (!S_ISREG(statbuf.st_mode)) {
close(fd);
continue;
}
len = statbuf.st_size;
numpages = len/PAGE_SIZE + ((len % PAGE_SIZE) != 0);
if (! (statbuf.st_mode & (S_IFREG|S_IFCHR))) {
pcount = 0;
} else if (len) {
if ((addr = mmap(0,len,PROT_READ,MAP_SHARED,fd,0)) == MAP_FAILED) {
fprintf(stderr, "mmap (%s): %s\n", av[optind],
strerror(errno));
close(fd);
status = 1;
continue;
}
pvec = malloc(numpages);
if (mincore(addr,len,pvec))
{
perror("mincore");
exit(1);
}
for(pcount = 0,pind = 0 ; pind < numpages ; pind++) {
if (pvec[pind]) pcount++;
}
free(pvec);
if (munmap(addr,len)) {
perror("munmap");
exit(1);
}
} else {
pcount = 0;
}
if (pcount || !only_nonzero) {
if (print_name) printf("%s: ",av[optind]);
printf("%d",pcount);
if (print_sizepages) printf("/%d",numpages);
printf("\n");
}
close(fd);
}
exit(status);
}
--
Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\
<> green@FreeBSD.org <> bfeldman@tislabs.com \ The Power to Serve! \
Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\
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