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65 lines
2.0 KiB
Plaintext
65 lines
2.0 KiB
Plaintext
@node stdlib.h
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@section @file{stdlib.h}
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/stdlib.h.html}
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Gnulib module: stdlib-h, system-posix
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@mindex stdlib-h
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@mindex system-posix
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Portability problems fixed by the Gnulib module @code{stdlib-h}:
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@itemize
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@item
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The macros @code{EXIT_SUCCESS} and @code{EXIT_FAILURE} are not defined on
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some platforms.
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@item
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Some platforms provide a @code{NULL} macro that cannot be used in arbitrary
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expressions:
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NetBSD 5.0
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@item
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Using the macro @code{MB_CUR_MAX} causes link errors on some platforms:
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Android NDK r16.
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@item
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The value of @code{MB_CUR_MAX} is too small (3 instead of 4) in UTF-8 locales
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on some platforms:
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Solaris 10.
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@end itemize
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Portability problems fixed by the Gnulib module @code{system-posix}:
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@itemize
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@item
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The macros @code{WIFSIGNALED}, @code{WIFEXITED}, @code{WIFSTOPPED},
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@code{WTERMSIG}, @code{WEXITSTATUS}, @code{WNOHANG}, @code{WUNTRACED},
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@code{WSTOPSIG} are not defined in this header file (only in
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@code{<sys/wait.h>}) on some platforms:
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MirBSD 10.
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@item
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The macro @code{WCOREDUMP} is not defined in this header file (only in
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@code{<sys/wait.h>}) on some platforms:
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@c https://sourceware.org/PR32551
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glibc 2.44.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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The definition of the type @code{once_flag}, of the macro
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@code{ONCE_FLAG_INIT}, and the declaration of the function
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@code{call_once}, that are required by ISO C 23, are not provided.
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@mindex call_once
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To get them, import Gnulib module @code{call_once} and include
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@code{<threads.h>} rather than @code{<stdlib.h>}.
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@item
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System status macros such as @code{WEXITSTATUS} require an lvalue
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argument on some platforms.
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macOS 11.1.
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@item
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POSIX.1-2024 allows, but does not require, this file to make visible
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all symbols from the headers @code{<fcntl.h>}, @code{<limits.h>},
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@code{<math.h>}, @code{<stddef.h>}, and @code{<sys/wait.h>}.
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Programs should not assume that these other symbols are visible merely
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because this file is included, or that they are invisible because only
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this file is included.
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@end itemize
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