forked from mirrors/tftp-hpa-google
1f4b33a1f7
bsd_signal() may not be defined, and there is really no reason to even try to use it if sigaction() is avaiable; using sigaction() guarantees the semantics we really want. Replace uses of common variables with explicit instantiation and extern declarations in a header file. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
42 lines
800 B
C
42 lines
800 B
C
/*
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* signal.c
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*
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* Use sigaction() to simulate BSD signal()
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*/
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#include "config.h"
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#ifdef HAVE_SIGACTION
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sighandler_t tftp_signal(int signum, sighandler_t handler)
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{
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struct sigaction action, oldaction;
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memset(&action, 0, sizeof action);
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action.sa_handler = handler;
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sigemptyset(&action.sa_mask);
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sigaddset(&action.sa_mask, signum);
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action.sa_flags = SA_RESTART;
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if (sigaction(signum, &action, &oldaction))
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return SIG_ERR;
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return oldaction.sa_handler;
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}
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#elif defined(HAVE_BSD_SIGNAL)
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sighandler_t tftp_signal(int signum, sighandler_t handler)
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{
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return bsd_signal(signum, handler);
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}
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#else
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/* This is dangerous at best. Let's hope it works. */
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sighandler_t tftp_signal(int signum, sighandler_t handler)
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{
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return signal(signum, handler);
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}
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#endif
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