gdb.info: lseek

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lseek

Synopsis:
     long lseek (int fd, long offset, int flag);
Request:
     Flseek,fd,offset,flag
   `flag' is one of:
`SEEK_SET'
     The offset is set to offset bytes.
`SEEK_CUR'
     The offset is set to its current location plus offset bytes.
`SEEK_END'
     The offset is set to the size of the file plus offset bytes.
Return value:
     On success, the resulting unsigned offset in bytes from
     the beginning of the file is returned.  Otherwise, a
     value of -1 is returned.
Errors:
`EBADF'
     fd is not a valid open file descriptor.
`ESPIPE'
     fd is associated with the GDB console.
`EINVAL'
     flag is not a proper value.
`EINTR'
     The call was interrupted by the user.