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6baa46639c
On cygwin 1.5.x, sleep amounts larger than 49.7 days (2**32 milliseconds) failed instantly, but with a garbage return value from uninitialized memory. * lib/sleep.c (rpl_sleep): Work around the bug. * m4/sleep.m4 (gl_FUNC_SLEEP): Detect the bug. (gl_PREREQ_SLEEP): Delete unused macro. * modules/sleep (Depends-on): Add verify. * m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Add default. * modules/unistd (Makefile.am): Substitute witness. * lib/unistd.in.h (sleep): Update prototype. * doc/posix-functions/sleep.texi (sleep): Document the bug. * tests/test-sleep.c (main) [HAVE_DECL_ALARM]: Test it. * modules/sleep-tests (Depends-on): Check for alarm. Signed-off-by: Eric Blake <ebb9@byu.net>
30 lines
741 B
Plaintext
30 lines
741 B
Plaintext
@node sleep
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@section @code{sleep}
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@findex sleep
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POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/sleep.html}
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Gnulib module: sleep
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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 (2005 or newer).
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@item
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This function takes milliseconds as argument and returns @code{void} on some
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platforms:
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mingw (2005 and older).
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@item
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This function cannot sleep longer than 49.7 days on some platforms:
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Cygwin 1.5.x.
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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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According to POSIX, the @code{sleep} function may interfere with the program's
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use of the @code{SIGALRM} signal. On Linux, it doesn't; on other platforms,
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it may.
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@end itemize
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