C <signal.h> - SIGABRT, SIGFPE, SIGILL, SIGINT, SIGSEGV, SIGTERM
The C <signal.h> SIGABRT, SIGFPE, SIGILL, SIGINT, SIGSEGV, SIGTERM macro constants expands to an integer constant expression with distinct values, which represent different signals sent to the program.
Macros | Description |
---|---|
SIGABRT | (Signal Abort) Abnormal termination, such as is initiated by the abort() function. |
SIGFPE | (Signal Floating-Point Exception) Erroneous arithmetic operation, such as zero divide or an operation resulting in overflow (not necessarily with a floating-point operation). |
SIGILL | (Signal Illegal Instruction) Invalid program image, such as an illegal instruction. This is generally due to a corruption in the code or to an attempt to execute data. |
SIGINT | (Signal Interrupt) Interactive attention signal. Generally generated by the application user. |
SIGSEGV | (Signal Segmentation Fault) Invalid memory access: When a program tries to read or write outside the memory it has allocated. |
SIGTERM | (Signal Terminate) Termination request sent to program. |
Definition in the <signal.h> header file is:
#define SIGABRT /* implementation defined */ #define SIGFPE /* implementation defined */ #define SIGILL /*implementation defined */ #define SIGINT /* implementation defined */ #define SIGSEGV /* implementation defined */ #define SIGTERM /* implementation defined */
Example:
The example below shows how the SIGINT macro constant is used to send signal to a program.
#include <signal.h> #include <stdio.h> volatile sig_atomic_t gSignalStatus = 0; void signal_handler(int signal) { gSignalStatus = signal; } int main(void) { //installing a signal handler signal(SIGINT, signal_handler); printf("SignalValue: %d\n", gSignalStatus); printf("Sending signal %d\n", SIGINT); raise(SIGINT); printf("SignalValue: %d\n", gSignalStatus); return 0; }
The output of the above code will be:
SignalValue: 0 Sending signal 2 SignalValue: 2
❮ C <signal.h> Library