| #include <unistd.h> |
| #include <sys/types.h> |
| #include <errno.h> |
| #include <assert.h> |
| #include <ros/syscall.h> |
| |
| /* potentially a 32 bit seek (off_t is a long) */ |
| off_t __libc_lseek (int fd, off_t offset, int whence) |
| { |
| loff_t retoff = 0; |
| off_t hi = 0; |
| off_t lo = 0; |
| off_t ret; |
| |
| if (fd < 0) { |
| __set_errno (EBADF); |
| return -1; |
| } |
| switch (whence) { |
| case SEEK_SET: |
| case SEEK_CUR: |
| case SEEK_END: |
| break; |
| default: |
| __set_errno (EINVAL); |
| return -1; |
| } |
| /* get the high and low part, regardless of whether offset was already |
| * 64 bits or not (casting to avoid warnings) */ |
| hi = (loff_t)offset >> 32; |
| lo = offset & 0xffffffff; |
| ret = ros_syscall(SYS_llseek, fd, hi, lo, &retoff, whence, 0); |
| if (ret) { |
| assert(ret == -1); /* catch odd bugs */ |
| return ret; |
| } |
| /* Get the lower 32 or 64 bits, depending on the length of long */ |
| ret = retoff & (unsigned long)(-1); |
| return ret; |
| } |
| weak_alias (__libc_lseek, __lseek) |
| libc_hidden_def (__lseek) |
| weak_alias (__libc_lseek, lseek) |
