1MEMCPY(3P)                 POSIX Programmer's Manual                MEMCPY(3P)
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PROLOG

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

12       memcpy — copy bytes in memory
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SYNOPSIS

15       #include <string.h>
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17       void *memcpy(void *restrict s1, const void *restrict s2, size_t n);
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DESCRIPTION

20       The functionality described on this reference page is aligned with  the
21       ISO C  standard.  Any  conflict between the requirements described here
22       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
23       defers to the ISO C standard.
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25       The  memcpy() function shall copy n bytes from the object pointed to by
26       s2 into the object pointed to by s1.  If copying  takes  place  between
27       objects that overlap, the behavior is undefined.
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RETURN VALUE

30       The  memcpy()  function shall return s1; no return value is reserved to
31       indicate an error.
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ERRORS

34       No errors are defined.
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36       The following sections are informative.
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EXAMPLES

39       None.
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APPLICATION USAGE

42       The memcpy() function does not check for the overflow of the  receiving
43       memory area.
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RATIONALE

46       None.
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FUTURE DIRECTIONS

49       None.
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SEE ALSO

52       The Base Definitions volume of POSIX.1‐2017, <string.h>
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55       Portions  of  this text are reprinted and reproduced in electronic form
56       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
57       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
58       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
59       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
60       event of any discrepancy between this version and the original IEEE and
61       The  Open Group Standard, the original IEEE and The Open Group Standard
62       is the referee document. The original Standard can be  obtained  online
63       at http://www.opengroup.org/unix/online.html .
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65       Any  typographical  or  formatting  errors that appear in this page are
66       most likely to have been introduced during the conversion of the source
67       files  to  man page format. To report such errors, see https://www.ker‐
68       nel.org/doc/man-pages/reporting_bugs.html .
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72IEEE/The Open Group                  2017                           MEMCPY(3P)
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