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* lib/poll.c: if recv returns ENOTSOCK, assume the descriptor is readable. In this case POLLHUP will not be supported. * doc/posix-functions/poll.texi: Document this. Copyright-paperwork-exempt: yes
35 lines
984 B
Plaintext
35 lines
984 B
Plaintext
@node poll
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@section @code{poll}
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@findex poll
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/poll.html}
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Gnulib module: poll
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This function is missing on some platforms:
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mingw, MSVC 9, BeOS, HP NonStop.
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@item
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This function doesn't work on special files like @file{/dev/null} and ttys like
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@file{/dev/tty} on some platforms:
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Mac OS X 10.4.0, AIX 5.3.
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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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Under BeOS, Gnulib's @code{poll} replacement can only be called on descriptors
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created by the @code{socket} function, not on regular file descriptors.
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@item
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Under Windows, when passing a pipe, Gnulib's @code{poll} replacement might
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return 0 even before the timeout has passed. Programs using it with pipes can
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thus busy wait.
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@item
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Under HP NonStop, file descriptors other than sockets do not support
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POLLHUP; they will return a "readable" status instead.
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@end itemize
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