kc3-lang/gnulib/doc/posix-functions/calloc.texi

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• Hash : 3498a703
  Author :
  Date : 2024-07-31T17:10:56
  

  errno: make EEXIST != ENOTEMPTY on AIX
  
  Also, improve errno tests.
  * m4/calloc.m4 (gl_FUNC_CALLOC_GNU):
  * m4/malloc.m4 (gl_FUNC_MALLOC_GNU):
  * m4/realloc.m4 (gl_FUNC_REALLOC_GNU):
  * m4/scandir.m4 (gl_FUNC_SCANDIR):
  Define _LINUX_SOURCE_COMPAT, as this can sometimes help on AIX.
  * m4/errno_h.m4 (gl_HEADER_ERRNO_H):
  Define _LINUX_SOURCE_COMPAT, to make EEXIST != ENOTEMPTY.
  * m4/strerror_r.m4 (gl_FUNC_STRERROR_R):
  Define _LINUX_SOURCE_COMPAT, in case someone else does.
  * modules/errno-tests (Depends-on): Add assert-h, c99.
  * tests/test-errno.c (e1, ..., e131): Remove, replacing with ...
  (CHECK_POSIX_ERRNOS, POSITIVE_INTEGER_CONSTANT_EXPRESSION)
  (INDEXED_BY_ERRNO, ERRNO_COUNT): These new macros.
  Check that all errno values are positive integer constant expressions.
  Check that they are all distinct, except perhaps for
  EWOULDBLOCK == EAGAIN and ENOTSUP == EOPNOTSUPP.
  Also check ESOCKTNOSUPPORT, added in POSIX.1-2024.
  Also, check that errno values are distinct except when POSIX says
  they needn’t be distinct, since POSIX.1-2024 gives license to
  GNU/Linux’s non-distinct values.
  

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• doc/posix-functions/calloc.texi

• @node calloc
  @subsection @code{calloc}
  @findex calloc
  
  POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/calloc.html}
  
  Gnulib module: calloc-posix
  
  Portability problems fixed by Gnulib:
  @itemize
  @item
  Upon failure, the function does not set @code{errno} to @code{ENOMEM} on
  some platforms:
  mingw, MSVC 14.
  
  @item
  On some platforms, @code{calloc (n, s)} can succeed even if
  multiplying @code{n} by @code{s} would exceed @code{PTRDIFF_MAX} or
  @code{SIZE_MAX}.  Although failing to check for exceeding
  @code{PTRDIFF_MAX} is arguably allowed by POSIX it can lead to
  undefined behavior later, so @code{calloc-posix} does not allow
  going over the limit.
  @end itemize
  
  Extension: Gnulib provides a module @samp{calloc-gnu} that substitutes a
  @code{calloc} implementation that behaves more like the glibc implementation.
  It fixes this portability problem:
  
  @itemize
  @item
  @code{calloc (0, s)} and @code{calloc (n, 0)} return @code{NULL} on success
  on some platforms:
  AIX 7.3.
  @end itemize
  

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