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e395879b76
* lib/unistd.in.h (write): Replace also when GNULIB_UNISTD_H_NONBLOCKING is not 1. * lib/write.c (write_nothrow): New function. (rpl_write): Define also when GNULIB_NONBLOCKING or GNULIB_SIGPIPE is not 1. Use write_nothrow. * m4/write.m4 (gl_FUNC_WRITE): Replace read if the platform has an invalid parameter handler. (gl_PREREQ_WRITE): New macro. * modules/write (Depends-on): Add msvc-inval. (configure.ac): Invoke gl_PREREQ_WRITE. * doc/posix-functions/write.texi: Mention the problem on MSVC.
46 lines
1.5 KiB
Plaintext
46 lines
1.5 KiB
Plaintext
@node write
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@section @code{write}
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@findex write
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/write.html}
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Gnulib module: write, nonblocking, sigpipe
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Portability problems fixed by Gnulib module @code{stdio}, together with module @code{nonblocking}:
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@itemize
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@item
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This function crashes when invoked with invalid arguments on some platforms:
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MSVC 9.
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@item
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When writing to a non-blocking pipe whose buffer is full, this function fails
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with @code{errno} being set to @code{ENOSPC} instead of @code{EAGAIN} on some
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platforms:
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mingw, MSVC 9.
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@item
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When writing to a non-blocking pipe on which no reader is currently waiting
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an amount of bytes that exceeds the pipe buffer's size, then -- even if the
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pipe's buffer is empty -- this function fails, instead of performing a partial
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write into the pipe buffer, on some platforms:
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mingw, MSVC 9.
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@end itemize
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Portability problems fixed by Gnulib module @code{stdio}, together with module @code{sigpipe}:
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@itemize
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@item
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When writing to a pipe with no readers, this function fails with error
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@code{EINVAL}, instead of obeying the current @code{SIGPIPE} handler, on
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some platforms:
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mingw, MSVC 9.
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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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This function may fail with error @code{EINTR}, even in programs that don't
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install any signal handlers, on some platforms:
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MacOS X 10.5.
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@end itemize
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For handling @code{EINTR}, Gnulib provides a module @samp{safe-write} with a
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function @code{safe_write}.
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