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pwrite (2)
  • pwrite (2) ( Solaris man: Системные вызовы )
  • pwrite (2) ( FreeBSD man: Системные вызовы )
  • pwrite (2) ( Русские man: Системные вызовы )
  • >> pwrite (2) ( Linux man: Системные вызовы )
  • pwrite (3) ( POSIX man: Библиотечные вызовы )
  •  

    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).  

    VERSIONS

    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.  

    CONFORMING TO

    POSIX.1-2001.  

    SEE ALSO

    lseek(2), read(2), write(2), feature_test_macros(7)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    VERSIONS
    CONFORMING TO
    SEE ALSO
    COLOPHON


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