simple-utils/zzz.c

/*
  
  zzz - a program to imitate FreeBSD's `zzz` sleep utility for laptops, only
  that this one uses `loginctl` for the backend.

  USAGE: zzz
  Sleeps the system (sudo may be required depending on the user's rights)

  Note that in order for this program to work, you must have loginctl available
  in your system. If your distribution uses systemd (i.e. Debian/Ubuntu based,
  Fedora, Arch Linux, etc), it will include it by default. Other non-systemd 
  distros can install the standalone elogind daemon instead.

  Copyright 2022- kzimmermann. All Rights reserved.

  This program is Free Software released under the terms and conditions of the
  GNU GPL v3. See https://gnu.org/licenses for more information

*/

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

int
main(int argc, char* argv[])
{
    char* stmt = "loginctl suspend";
    FILE* p;

    p = popen(stmt, "r");
    if (p == NULL) {
        printf("Error: `loginctl` not found.\n");
        printf("You must have loginctl installed (see elogind) in order to suspend your machine in a modern way\n");
        return 1;
    }
    pclose(p);
    return 0;
}