sleepsystem.c

#include <IOKit/pwr_mgt/IOPMLib.h>
#include <IOKit/IOMessage.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>

static void sleepHandler(int sleepType)
{
    io_connect_t connect = IOPMFindPowerManagement(kIOMasterPortDefault);

    IOReturn ret = IOPMSleepSystem(connect);

    if (ret != kIOReturnSuccess) {
        if (ret == kIOReturnNotPrivileged) {
            printf("Sleep error 0x%08x; You must run this as root.\n", ret);
            exit(EX_NOPERM);
        } else {
            printf("Unable to sleep system: error 0x%08x\n", ret);
            exit(EX_OSERR);
        }
    } else {
        printf("Sleeping now...\n");
    }
}

int main(int argc, char *argv[])
{
    int sleepType = 0;
    sleepHandler(sleepType);
    return 0;
}