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PREAD (2) | System calls | Unix Manual Pages | :man

NAME

pread, pwrite - read from or write to a file descriptor at a given offset

CONTENTS

Synopsis
Description
Errors
History

SYNOPSIS

#define _XOPEN_SOURCE 500

#include <unistd.h>

"ssize_t pread(int "fd", void *"buf", size_t "count", off_t "offset);

"ssize_t pwrite(int "fd", const void *"buf", size_t "count", off_t "offset);

DESCRIPTION

pread() reads up to count bytes from file descriptor fd at offset offset (from the start of the file) into the buffer starting at buf. The file offset is not changed.

pwrite() writes up to count bytes from the buffer starting at buf to the file descriptor fd at offset offset. The file offset is not changed.

The file referenced by fd must be capable of seeking.

"RETURN VALUE"

On success, the number of bytes read or written is returned (zero indicates that nothing was written, in the case of pwrite, or end of file, in the case of pread), or -1 on error, in which case errno is set to indicate the error.

ERRORS

pread can fail and set errno to any error specified for read(2) or lseek(2). pwrite can fail and set errno to any error specified for write(2) or lseek(2).

"CONFORMING TO"

Unix98

HISTORY

The pread and pwrite system calls were added to Linux in version 2.1.60; the entries in the i386 system call table were added in 2.1.69. The libc support (including emulation on older kernels without the system calls) was added in glibc 2.1.

"SEE ALSO"

read(2), write(2), lseek(2)


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