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poll
POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/poll.html
Gnulib module: poll
Portability problems fixed by Gnulib:
Portability problems not fixed by Gnulib:
poll
replacement can only be called on descriptors
created by the socket
function, not on regular file descriptors.
poll
replacement might
return 0 even before the timeout has passed. Programs using it with pipes can
thus busy wait.