Messages in this thread |  | | | Date | Sat, 15 Dec 2001 19:47:46 -0500 (EST) | | From | Suresh Gopalakrishnan <> | | Subject | O_DIRECT wierd behavior.. |
| |
I tried this small piece of code from an old post in the archive:
#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <sys/stat.h> #include <sys/types.h> #include <unistd.h>
#define O_DIRECT 040000 /* direct disk access hint */ int main() { char buf[16384]; int fd; char *p; p = (char *)((((unsigned long)buf) + 8191) & ~8191L); fd = open("/tmp/blah", O_CREAT | O_RDWR | O_DIRECT); printf("write returns %i\n", write(fd, buf, 8192)); printf("write returns %i\n", write(fd, p, 1));
return 0; } Output is:
write returns -1 Filesize limit exceeded (core dumped)
$ ls -l /tmp/blah ---------- 1 gsuresh users 4294967274 Dec 15 19:15 /tmp/blah The kernel is 2.4.16 and /tmp is ext2. (It runs fine on 2.4.2).
Any idea why this happens and how to fix this?
Thanks --suresh
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |