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7bad64eadf
* lib/unistd.in.h (read): Replace also when GNULIB_UNISTD_H_NONBLOCKING is not 1. * lib/read.c (read_nothrow): New function. (rpl_read): Define also when GNULIB_NONBLOCKING is not 1. Use read_nothrow. * m4/read.m4 (gl_FUNC_READ): Replace read if the platform has an invalid parameter handler. (gl_PREREQ_READ): New macro. * modules/read (Depends-on): Add msvc-inval. (configure.ac): Invoke gl_PREREQ_READ. * doc/posix-functions/read.texi: Mention the problem on MSVC.
31 lines
894 B
Plaintext
31 lines
894 B
Plaintext
@node read
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@section @code{read}
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@findex read
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/read.html}
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Gnulib module: stdio, nonblocking
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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 reading from a non-blocking pipe whose buffer is empty, this function
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fails with @code{errno} being set to @code{EINVAL} instead of @code{EAGAIN} 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-read} with a
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function @code{safe_read}.
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