sysv_signal - signal handling with System V semantics

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                                                                   │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │ sysv_signal()                                                               │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

       The 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.

       As for signal(2).

       Standard C library (libc, -lc)

       sysv_signal - signal handling with System V semantics

       The sysv_signal() function returns the previous value of the signal handler, or SIG_ERR on error.

sigaction(2), signal(2), bsd_signal(3), signal(7)

Linux man-pages 6.9.1                              2024-05-02                                     sysv_signal(3)

       None.

#define_GNU_SOURCE         /* See feature_test_macros(7) */
       #include<signal.h>typedefvoid(*sighandler_t)(int);sighandler_tsysv_signal(intsignum,sighandler_thandler);

       Use of sysv_signal() should be avoided; use sigaction(2) instead.

       On older Linux systems, sysv_signal() and signal(2) were equivalent.  But  on  newer  systems,  signal(2)
       provides reliable signal semantics; see signal(2) for details.

       The  use  of  sighandler_t  is a GNU extension; this type is defined only if the _GNU_SOURCE feature test
       macro is defined.