fcntl

PHOTO EMBED

Fri Jun 07 2024 04:49:24 GMT+0000 (Coordinated Universal Time)

Saved by @prabhas 

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

int main() {
    int file;
    int flags;

    // Open file
    file = open("file.txt", O_RDWR);
    if (file == -1) {
        perror("Error opening file");
        exit(EXIT_FAILURE);
    }

    // Get file descriptor flags
    flags = fcntl(file, F_GETFL);
    if (flags == -1) {
        perror("Error getting file flags");
        close(file);
        exit(EXIT_FAILURE);
    }

    // Set file descriptor flags to append mode
    flags |= O_APPEND;
    if (fcntl(file, F_SETFL, flags) == -1) {
        perror("Error setting file flags");
        close(file);
        exit(EXIT_FAILURE);
    }

    // Write to file
    if (write(file, "Appending this line\n", 20) == -1) {
        perror("Error writing to file");
    }

    // Close file
    close(file);

    return 0;
}
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