This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       None.

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for  Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical  and  Electronics
       Engineers, Inc and The Open Group.  In the event of any discrepancy between this version and the original
       IEEE  and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document.
       The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have  been  introduced
       during   the   conversion  of  the  source  files  to  man  page  format.  To  report  such  errors,  see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                                        MEMCMP(3POSIX)

       The  functionality  described  on  this  reference  page is aligned with the ISO C standard. Any conflict
       between the requirements described  here  and  the  ISO C  standard  is  unintentional.  This  volume  of
       POSIX.1‐2017 defers to the ISO C standard.

       The  memcmp()  function shall compare the first n bytes (each interpreted as unsignedchar) of the object
       pointed to by s1 to the first n bytes of the object pointed to by s2.

       The sign of a non-zero return value shall be determined by the sign of the difference between the  values
       of  the  first  pair  of  bytes (both interpreted as type unsignedchar) that differ in the objects being
       compared.

       No errors are defined.

       Thefollowingsectionsareinformative.

       None.

       None.

       memcmp — compare bytes in memory

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult the corresponding Linux manual page for details of Linux behavior), or the  interface
       may not be implemented on Linux.

       None.

       The memcmp() function shall return an integer greater than, equal to, or  less  than  0,  if  the  object
       pointed to by s1 is greater than, equal to, or less than the object pointed to by s2, respectively.

       The Base Definitions volume of POSIX.1‐2017, <string.h>

       #include <string.h>

       int memcmp(const void *s1, const void *s2, size_t n);