How to capture Control+D signal?

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I want to capture the Ctrl+D signal in my program and write a signal handler for it. How can I do that? I am working on C and using a Linux system.

signals unix linux c
8 Answers

Ctrl + D value in ascci table is 4 and is a non printable characters.
So your can capture it in a terminal with the following code. When getline function get Ctrl + D an error occur and return value is -1. Your can make a condition on the return value.

#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    char *buf = malloc(sizeof(char) * 500);
    size_t size = 500;
    int nb = getline(&buf, &size, stdin);
    if (nb == -1)
        printf("CTRL + D captured\n");
    free(buf);
    return (0);
}
user_149121050

You can check if stdin is not of with the feof method like so:

if (feof(stdin))
{
    // some code
    exit(0);
}

See this for more details/

user_85931090
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