__sighandler_t - Illumos

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#define SIG_DFL ((__sighandler_t *)0)

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#define SIG_IGN ((__sighandler_t *)1)

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#define SIG_ERR ((__sighandler_t *)-1)

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#define SIG_HOLD ((__sighandler_t *)3)

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typedef __sighandler_t *sig_t; /* type of pointer to a signal function */

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__sighandler_t *sv_handler; /* signal handler */

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__sighandler_t *signal(int, __sighandler_t *);