# Standard library header <csignal>

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< cpp‎ | header

This header was originally in the C standard library as `<signal.h>`.

This header is part of the program support library.

### Typedefs
sig_atomic_t | the integer type that can be accessed as an atomic entity from an asynchronous signal handler (typedef)
### Macros
SIGABRT SIGFPE SIGILL SIGINT SIGSEGV SIGTERM | defines signal types (macro constant)
SIG_DFL SIG_IGN | defines signal handling strategies (macro constant)
SIG_ERR | return value of `signal` specifying that an error was encountered (macro constant)
### Functions
signal | sets a signal handler for particular signal (function)
raise | runs the signal handler for particular signal (function)

### Synopsis

    namespace std {
      using sig_atomic_t = /*see description*/ ;
      extern "C" using /*signal-handler*/ = void(int); // exposition only
      /*signal-handler*/ * signal(int sig, /*signal-handler*/ * func);
    }
    #define SIG_DFL /*see description*/
    #define SIG_ERR /*see description*/
    #define SIG_IGN /*see description*/
    #define SIGABRT /*see description*/
    #define SIGFPE /*see description*/
    #define SIGILL /*see description*/
    #define SIGINT /*see description*/
    #define SIGSEGV /*see description*/
    #define SIGTERM /*see description*/

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