signal function c

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The signal function in C is used to handle various signals sent to a program. It allows a program to define custom actions to be taken when a particular signal is received. The signal function takes two arguments: the signal number and a pointer to a signal handler function.

The signal number is an integer value that represents a specific signal. Some common signal numbers include SIGINT (interrupt signal), SIGTERM (termination signal), and SIGSEGV (segmentation fault signal).

The signal handler function is a user-defined function that is called when the specified signal is received. It takes one argument, which is the signal number. The handler function can perform any necessary actions, such as saving data, cleaning up resources, or terminating the program.

Here is an example of how to use the signal function to handle the SIGINT signal:

#include <stdio.h>
#include <signal.h>

void sigint_handler(int signum) {
    printf("Received SIGINT signal. Exiting...\n");
    // Perform cleanup or other necessary actions
    // ...
    exit(0);
}

int main() {
    // Register the signal handler function for SIGINT
    signal(SIGINT, sigint_handler);

    // Rest of the program code
    // ...

    return 0;
}

In this example, when the program receives the SIGINT signal (usually generated by pressing Ctrl+C in the terminal), the sigint_handler function is called. It prints a message and exits the program.

Note that the behavior of the signal function can vary across different operating systems and versions of C. It is recommended to consult the documentation or specific platform guidelines for accurate usage and compatibility information.