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Bruno Haible
c36a0f21b3
* doc/Makefile (undocumented-modules.texi): New rule. (%.info, %.html, %.dvi, %.pdf): Depend on undocumented-modules.texi. (mostlyclean): Remove also *.m and *.tmp. (force): New rule. * doc/*.texi: Add module index entries. * doc/*/*.texi: Likewise.
32 lines
894 B
Plaintext
32 lines
894 B
Plaintext
@node poll
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@subsection @code{poll}
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@findex poll
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/poll.html}
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Gnulib module: poll
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@mindex 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 14, 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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macOS 14, 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 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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On some platforms, file descriptors other than sockets do not support
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POLLHUP; they will return a "readable" or "writable" status instead:
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AIX 7.2, Cygwin 3.4.6, HP NonStop, mingw, MSVC.
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@end itemize
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