Attachment 296422 Details for Bug 432824 – program to recreate bug

program to recreate bug

gen_shrink.c (text/x-csrc), 1.23 KB, created by Abhijith Das on 2008-02-29 21:42:11 UTC

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Filename:

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Creator: Abhijith Das

Created: 2008-02-29 21:42:11 UTC

Size: 1.23 KB

patch

obsolete

>#include <stdio.h>
>#include <unistd.h>
>#include <stdlib.h>
>#include <signal.h>
>#include <setjmp.h>
>#include <string.h>
>#include <limits.h>
>#include <errno.h>
>#include <dirent.h>
>#include <fcntl.h>
>#include <ctype.h>
>#include <time.h>
>#include <sched.h>
>#include <sys/mman.h>
>#include <sys/times.h>
>#include <sys/types.h>
>#include <sys/stat.h>
>#include <sys/wait.h>
>#include <sys/file.h>
>
>
>char bar[] = "/mnt/brawl/bar";
>char tmp[] = "/tmp/t";
>char megbuf[50000];
>int barsize = 50000;
>
>void create()
>{
>	int fd;
>	fd = open(bar, O_RDWR|O_CREAT, 0666);
>	write(fd, megbuf, barsize);
>	close(fd);
>}
>
>void shrink1()
>{
>	int fd, tsize;
>	char *oldfilep;
>	struct stat sb;
>
>	fd = open(bar, O_RDWR);
>	fstat(fd, &sb);
>	tsize = 41000;
>	
>	oldfilep = mmap(0, sb.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
>
>	ftruncate(fd, tsize);
>	
>	memcpy(oldfilep, megbuf, tsize);
>	munmap(oldfilep, sb.st_size);
>	
>	close(fd);
>}
>
>void shrink2()
>{
>	int fd;
>	struct stat sb;
>	char *oldfilep;
>	char buf[41000];
>
>	fd = open(bar, O_RDWR);
>	fstat(fd, &sb);
>	
>	oldfilep = mmap(0, sb.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
>	memcpy(buf, oldfilep, 40961);
>	munmap(oldfilep, sb.st_size);
>
>	close(fd);
>}
>
>int main(int argc, char **argv)
>{
>	create();
>	shrink1();
>	shrink2();
>	return 0;
>}

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Attachments on bug 432824: 296422