sysv_signal (3) - Linux Man Pages
sysv_signal: signal handling with System V semantics
sysv_signal - signal handling with System V semantics
SYNOPSIS#define _GNU_SOURCE /* See feature_test_macros(7) */
typedef void (*sighandler_t)(int);
DESCRIPTIONThe sysv_signal() function takes the same arguments, and performs the same task, as signal(2).
However sysv_signal() provides the System V unreliable signal semantics, that is: a) the disposition of the signal is reset to the default when the handler is invoked; b) delivery of further instances of the signal is not blocked while the signal handler is executing; and c) if the handler interrupts (certain) blocking system calls, then the system call is not automatically restarted.
RETURN VALUEThe sysv_signal() function returns the previous value of the signal handler, or SIG_ERR on error.
ERRORSAs for signal(2).
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
CONFORMING TOThis function is nonstandard.
NOTESUse of sysv_signal() should be avoided; use sigaction(2) instead.
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