[3953] in arla-drinkers
xfs behaviour on OpenBSD
daemon@ATHENA.MIT.EDU (Kristaps Johnson)
Thu Jun 15 07:30:02 2006
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Date: Thu, 15 Jun 2006 07:29:53 -0400 (EDT)
From: Kristaps Johnson <kristaps@gradient-enterprises.com>
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To: arla-drinkers@stacken.kth.se
Subject: xfs behaviour on OpenBSD
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Hello everybody. I wonder if somebody can shed some light on strange
behahiour (or sloppy thinking on my part).
If I mount_xfs on OpenBSD (3.9), and run two versions of a programme, one
that read(2)s and one that fread(3)s, the read returns end-of-file while
the fread returns correct values.
Sample code (minimal for brevity):
-------
#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
int
main(int argc, char *argv[])
{
char c = 0;
#if READ
int fd = open("/dev/xfs0", O_RDWR);
read(fd, &c, 1);
#else /* FREAD */
FILE *f = fopen("/dev/xfs0", "r+");
fread(&c, 1, 1, f);
#endif
printf("read character %d\n", c);
return(0);
}
--------
...just to demonstrate. When I raise an oper (e.g., "ls /mnt/xfs0") the
read returns end-of-file while the fread returns a proper value.
Any suggestions?
Thanks,
Kristaps
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