59 lines
2.7 KiB
Diff
59 lines
2.7 KiB
Diff
commit dcad78507433a9a64b8b548b19e110933f8d939a
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Author: DJ Delorie <dj@redhat.com>
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Date: Thu Oct 10 17:16:35 2024 -0400
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manual: Document stdio.h functions that may be macros
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Glibc has two gnu-extension functions that are implemented as
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macros but not documented as such: fread_unlocked and
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fwrite_unlocked. Document them as such.
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Additionally, putc_unlocked and getc_unlocked are documented in
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POSIX as possibly being macros. Update the manual to add a warning
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about those also, depite glibc not implementing them as macros.
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diff --git a/manual/stdio.texi b/manual/stdio.texi
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index aa137e9888b5b59d..1708d33b10a63b89 100644
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--- a/manual/stdio.texi
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+++ b/manual/stdio.texi
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@@ -921,6 +921,9 @@ Therefore, @var{stream} should never be an expression with side-effects.
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@safety{@prelim{}@mtsafe{@mtsrace{:stream}}@asunsafe{@asucorrupt{}}@acunsafe{@acucorrupt{}}}
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The @code{putc_unlocked} function is equivalent to the @code{putc}
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function except that it does not implicitly lock the stream.
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+Like @code{putc}, it may be implemented as a macro and may evaluate
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+the @var{stream} argument more than once. Therefore, @var{stream}
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+should not be an expression with side-effects.
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@end deftypefun
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@deftypefun wint_t putwc_unlocked (wchar_t @var{wc}, FILE *@var{stream})
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@@ -1124,6 +1127,9 @@ Therefore, @var{stream} should never be an expression with side-effects.
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@safety{@prelim{}@mtsafe{@mtsrace{:stream}}@asunsafe{@asucorrupt{}}@acunsafe{@acucorrupt{}}}
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The @code{getc_unlocked} function is equivalent to the @code{getc}
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function except that it does not implicitly lock the stream.
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+Like @code{getc}, it may be implemented as a macro and may evaluate
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+the @var{stream} argument more than once. Therefore, @var{stream}
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+should not be an expression with side-effects.
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@end deftypefun
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@deftypefun wint_t getwc_unlocked (FILE *@var{stream})
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@@ -1563,6 +1569,9 @@ The @code{fread_unlocked} function is equivalent to the @code{fread}
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function except that it does not implicitly lock the stream.
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This function is a GNU extension.
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+This function may be implemented as a macro and may evaluate
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+@var{stream} more than once. Therefore, @var{stream} should not be an
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+expression with side-effects.
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@end deftypefun
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@deftypefun size_t fwrite (const void *@var{data}, size_t @var{size}, size_t @var{count}, FILE *@var{stream})
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@@ -1581,6 +1590,9 @@ The @code{fwrite_unlocked} function is equivalent to the @code{fwrite}
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function except that it does not implicitly lock the stream.
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This function is a GNU extension.
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+This function may be implemented as a macro and may evaluate
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+@var{stream} more than once. Therefore, @var{stream} should not be an
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+expression with side-effects.
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@end deftypefun
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@node Formatted Output
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