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-.\" Copyright (C) 1999 Joseph Samuel Myers.
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH pread 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-pread, pwrite \- read from or write to a file descriptor at a given offset
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.BI "ssize_t pread(int " fd ", void " buf [. count "], size_t " count ,
-.BI "              off_t " offset );
-.BI "ssize_t pwrite(int " fd ", const void " buf [. count "], size_t " count ,
-.BI "              off_t " offset );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR pread (),
-.BR pwrite ():
-.nf
-    _XOPEN_SOURCE >= 500
-        || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
-.fi
-.SH DESCRIPTION
-.BR pread ()
-reads up to
-.I count
-bytes from file descriptor
-.I fd
-at offset
-.I offset
-(from the start of the file) into the buffer starting at
-.IR buf .
-The file offset is not changed.
-.P
-.BR pwrite ()
-writes up to
-.I count
-bytes from the buffer starting at
-.I buf
-to the file descriptor
-.I fd
-at offset
-.IR offset .
-The file offset is not changed.
-.P
-The file referenced by
-.I fd
-must be capable of seeking.
-.SH RETURN VALUE
-On success,
-.BR pread ()
-returns the number of bytes read
-(a return of zero indicates end of file)
-and
-.BR pwrite ()
-returns the number of bytes written.
-.P
-Note that it is not an error for a successful call to transfer fewer bytes
-than requested (see
-.BR read (2)
-and
-.BR write (2)).
-.P
-On error, \-1 is returned and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.BR pread ()
-can fail and set
-.I errno
-to any error specified for
-.BR read (2)
-or
-.BR lseek (2).
-.BR pwrite ()
-can fail and set
-.I errno
-to any error specified for
-.BR write (2)
-or
-.BR lseek (2).
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.P
-Added in Linux 2.1.60;
-the entries in the i386 system call table were added in Linux 2.1.69.
-C library support (including emulation using
-.BR lseek (2)
-on older kernels without the system calls) was added in glibc 2.1.
-.SS C library/kernel differences
-On Linux, the underlying system calls were renamed
-in Linux 2.6:
-.BR pread ()
-became
-.BR pread64 (),
-and
-.BR pwrite ()
-became
-.BR pwrite64 ().
-The system call numbers remained the same.
-The glibc
-.BR pread ()
-and
-.BR pwrite ()
-wrapper functions transparently deal with the change.
-.P
-On some 32-bit architectures,
-the calling signature for these system calls differ,
-for the reasons described in
-.BR syscall (2).
-.SH NOTES
-The
-.BR pread ()
-and
-.BR pwrite ()
-system calls are especially useful in multithreaded applications.
-They allow multiple threads to perform I/O on the same file descriptor
-without being affected by changes to the file offset by other threads.
-.SH BUGS
-POSIX requires that opening a file with the
-.B O_APPEND
-flag should have no effect on the location at which
-.BR pwrite ()
-writes data.
-However, on Linux, if a file is opened with
-.\" FIXME . https://bugzilla.kernel.org/show_bug.cgi?id=43178
-.BR O_APPEND ,
-.BR pwrite ()
-appends data to the end of the file, regardless of the value of
-.IR offset .
-.SH SEE ALSO
-.BR lseek (2),
-.BR read (2),
-.BR readv (2),
-.BR write (2)