55 lines
1 KiB
C
55 lines
1 KiB
C
#include <sys/cdefs.h>
|
|
#include "namespace.h"
|
|
#include <lib.h>
|
|
|
|
#include <minix/u64.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
|
|
#ifdef __weak_alias
|
|
__weak_alias(lseek, _lseek)
|
|
#endif
|
|
|
|
i32_t __lseek_321(int fd, i32_t offset, int whence);
|
|
|
|
i32_t __lseek_321(int fd, i32_t offset, int whence)
|
|
{
|
|
message m;
|
|
|
|
m.m2_i1 = fd;
|
|
m.m2_l1 = offset;
|
|
m.m2_i2 = whence;
|
|
if (_syscall(VFS_PROC_NR, LSEEK_321, &m) < 0) return(-1);
|
|
return( (i32_t) m.m2_l1);
|
|
}
|
|
|
|
off_t
|
|
lseek(int fd, off_t offset, int whence)
|
|
{
|
|
message m;
|
|
int orig_errno;
|
|
|
|
m.m2_i1 = fd;
|
|
m.m2_l1 = ex64lo(offset);
|
|
m.m2_l2 = ex64hi(offset);
|
|
m.m2_i2 = whence;
|
|
|
|
orig_errno = errno;
|
|
if (_syscall(VFS_PROC_NR, LSEEK, &m) < 0) {
|
|
if (errno == ENOSYS) {
|
|
/* Old VFS, no support for new lseek */
|
|
if (offset >= INT_MIN && offset <= INT_MAX) {
|
|
/* offset fits in old range, retry */
|
|
errno = orig_errno;
|
|
return (off_t) __lseek_321(fd, (i32_t) offset, whence);
|
|
}
|
|
|
|
/* Not going to fit */
|
|
errno = EOVERFLOW;
|
|
}
|
|
|
|
return( (off_t) -1);
|
|
}
|
|
return( (off_t) make64(m.m2_l1, m.m2_l2));
|
|
}
|