minix/lib/libc/sys/lseek.c

   1 #include <sys/cdefs.h>
   2 #include "namespace.h"
   3 #include <lib.h>
   4
   5 #include <string.h>
   6 #include <minix/u64.h>
   7 #include <unistd.h>
   8
   9 #ifdef __weak_alias
  10 __weak_alias(lseek, _lseek)
  11 #endif
  12
  13 off_t
  14 lseek(int fd, off_t offset, int whence)
  15 {
  16   message m;
  17
  18   memset(&m, 0, sizeof(m));
  19   m.m_lc_vfs_lseek.fd = fd;
  20   m.m_lc_vfs_lseek.offset = offset;
  21   m.m_lc_vfs_lseek.whence = whence;
  22   if (_syscall(VFS_PROC_NR, VFS_LSEEK, &m) < 0) return( (off_t) -1);
  23   return(m.m_vfs_lc_lseek.offset);
  24 }