minix/lib/libc/sys-minix/lseek.c
David van Moolenbroek 24ec0d73b5 Clean up interface to PM and VFS
- introduce new call numbers, names, and field aliases;
- initialize request messages to zero for all ABI calls;
- format callnr.h in the same way as com.h;
- redo call tables in both servers;
- remove param.h namespace pollution in the servers;
- make brk(2) go to VM directly, rather than through PM;
- remove obsolete BRK, UTIME, and WAIT calls;
- clean up path copying routine in VFS;
- move remaining system calls from libminlib to libc;
- correct some errno-related mistakes in libc routines.

Change-Id: I2d8ec5d061cd7e0b30c51ffd77aa72ebf84e2565
2014-03-01 09:05:01 +01:00

25 lines
544 B
C

#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <string.h>
#include <minix/u64.h>
#include <unistd.h>
#ifdef __weak_alias
__weak_alias(lseek, _lseek)
#endif
off_t
lseek(int fd, off_t offset, int whence)
{
message m;
memset(&m, 0, sizeof(m));
m.VFS_LSEEK_FD = fd;
m.VFS_LSEEK_OFF_LO = ex64lo(offset);
m.VFS_LSEEK_OFF_HI = ex64hi(offset);
m.VFS_LSEEK_WHENCE = whence;
if (_syscall(VFS_PROC_NR, VFS_LSEEK, &m) < 0) return( (off_t) -1);
return( (off_t) make64(m.VFS_LSEEK_OFF_LO, m.VFS_LSEEK_OFF_HI));
}