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RedHat 9 (Linux i386) - man page for pwrite (redhat section 2)

PREAD(2)			    Linux Programmer's Manual				 PREAD(2)

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

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)

Linux 2.2.0-pre9			    1999-01-21					 PREAD(2)


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