LLSEEKSection: Linux Programmer's Manual (2)
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NAME_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);
DESCRIPTIONThe _llseek() system call repositions the offset of the open file description associated with the file descriptor fd to (offset_high<<32) | offset_low bytes relative to the beginning of the file, the current file offset, 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.
RETURN VALUEUpon 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.
CONFORMING TOThis function is Linux-specific, and should not be used in programs intended to be portable.
NOTESGlibc does not provide a wrapper for this system call. To invoke it directly, use syscall(2). However, you probably want to use the lseek(2) wrapper function instead.
SEE ALSOlseek(2), open(2), lseek64(3)
COLOPHONThis page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
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