Ubuntu Manpages

_llseek

reposition read/write file offset

#include <sys/types.h>
#include <unistd.h>

int _llseek(unsigned int fd, unsigned long offset_high,
            unsigned long offset_low, loff_t *result,
            unsigned int whence);

Note: There is no glibc wrapper for this system call; see NOTES.

The _llseek() function repositions the offset of the open file associated with the file descriptor fd to (offset_high<<32) | offset_low bytes relative to the beginning of the file, the current position in the file, or the end of the file, depending on whether whence is SEEK_SET, SEEK_CUR, or SEEK_END, respectively. It returns the resulting file position in the argument result.

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

fd is not an open file descriptor.
Problem with copying results to user space.
whence is invalid.

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

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

lseek(2), lseek64(3)

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