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38 lines
1.3 KiB
Plaintext
38 lines
1.3 KiB
Plaintext
@node select
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@section @code{select}
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@findex select
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POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/select.html}
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Gnulib module: select
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Portability problems fixed by Gnulib:
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@itemize
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@item
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On Windows platforms (excluding Cygwin), @code{select} can only be
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called on descriptors created by the @code{socket} function, not on regular
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file descriptors.
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@item
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On Windows platforms (excluding Cygwin), error codes for @code{accept} are not
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placed in @code{errno}, and @code{WSAGetLastError} must be used instead.
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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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When you call @code{select} with a timeout, some implementations modify the
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timeout parameter so that upon return from the function, it contains the
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amount of time not slept. Other implementations leave the timeout parameter
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unmodified.
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@item
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On BeOS, @code{select} can only be called on descriptors created by the
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@code{socket} function, not on regular file descriptors.
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@item
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On Solaris 2.6 and older, @code{select} applied to a file descriptor opened
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for reading and associated with @code{/dev/null} hangs, waiting for input,
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when instead it should return immediately.
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@item
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On Linux, when some file descriptor refers to a regular file, @code{select}
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may fail, setting @code{errno} to @code{EBADF}.
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@end itemize
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