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31 lines
817 B
C
31 lines
817 B
C
/*
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* PuTTY's wrapper on signal(2).
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*
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* Calling signal() is non-portable, as it varies in meaning between
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* platforms and depending on feature macros, and has stupid semantics
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* at least some of the time.
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*
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* This function provides the same interface as the libc function, but
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* provides consistent semantics. It assumes POSIX semantics for
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* sigaction() (so you might need to do some more work if you port to
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* something ancient like SunOS 4).
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*/
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#include <signal.h>
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#include "defs.h"
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void (*putty_signal(int sig, void (*func)(int)))(int)
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{
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struct sigaction sa;
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struct sigaction old;
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sa.sa_handler = func;
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if (sigemptyset(&sa.sa_mask) < 0)
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return SIG_ERR;
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sa.sa_flags = SA_RESTART;
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if (sigaction(sig, &sa, &old) < 0)
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return SIG_ERR;
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return old.sa_handler;
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}
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