llseek(2)

1LLSEEK(2)                  Linux Programmer's Manual                 LLSEEK(2)
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NAME

6       _llseek - reposition read/write file offset
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SYNOPSIS

9       #include <sys/types.h>
10       #include <unistd.h>
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12       int _llseek(unsigned int fd, unsigned long offset_high,
13                   unsigned long offset_low, loff_t *result,
14                   unsigned int whence);
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16       Note: There is no glibc wrapper for this system call; see NOTES.
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DESCRIPTION

19       The  _llseek() function repositions the offset of the open file associ‐
20       ated with the file descriptor  fd  to  (offset_high<<32)  |  offset_low
21       bytes  relative  to  the beginning of the file, the current position in
22       the file, or the end of  the  file,  depending  on  whether  whence  is
23       SEEK_SET,  SEEK_CUR, or SEEK_END, respectively.  It returns the result‐
24       ing file position in the argument result.
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RETURN VALUE

27       Upon successful completion, _llseek() returns 0.  Otherwise, a value of
28       -1 is returned and errno is set to indicate the error.
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ERRORS

31       EBADF  fd is not an open file descriptor.
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33       EFAULT Problem with copying results to user space.
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35       EINVAL whence is invalid.
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CONFORMING TO

38       This  function  is  Linux-specific,  and should not be used in programs
39       intended to be portable.
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NOTES

42       Glibc does not provide a wrapper for this system call;  call  it  using
43       syscall(2).
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COLOPHON

49       This  page  is  part of release 3.53 of the Linux man-pages project.  A
50       description of the project, and information about reporting  bugs,  can
51       be found at http://www.kernel.org/doc/man-pages/.
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55Linux                             2012-07-13                         LLSEEK(2)