signali

#define _DEFAULT_SOURCE
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <signal.h>
#include <stdint.h>
#include <string.h>
#include <ctype.h>

#define UNUSED_FUNC_ARG(x) ((void)x)

#define osAssert(cond, msg) osErrorFatal(cond, msg, __FILE__, __LINE__)

void obrni_rec(char* niska);
void zameni_mala_sa_velikim(char* niska);
void osErrorFatal(bool cond, const char *msg, const char *file, int line);
void sigUsr1Handler(int sigNum);
void sigUsr2Handler(int sigNum);
void sigTermHandler(int sigNum);


int sig_usr1 = 0;
int sig_usr2 = 0;
int terminate = 0;

int main(int argc, char** argv)
{
    fprintf(stderr, "%d\n", getpid());
    osAssert(SIG_ERR != signal(SIGUSR1, sigUsr1Handler), "signal failed");
    osAssert(SIG_ERR != signal(SIGUSR2, sigUsr2Handler), "signal failed");
    osAssert(SIG_ERR != signal(SIGTERM, sigTermHandler), "signal failed");
    char rec[64];

    while(!terminate)
    {
        scanf("%s", rec);
        pause();

        if(sig_usr1 > 0)
        {
            obrni_rec(rec);
            sig_usr1 = 0;
        }
        if(sig_usr2 > 0)
        {
            zameni_mala_sa_velikim(rec);
            sig_usr2 = 0;
        }
    }
    return 0;
}

void sigUsr1Handler(int sigNum)
{
    UNUSED_FUNC_ARG(sigNum);
    sig_usr1++;
}

void sigUsr2Handler(int sigNum)
{
    UNUSED_FUNC_ARG(sigNum);
    sig_usr2++;
}

void sigTermHandler(int sigNum)
{
    UNUSED_FUNC_ARG(sigNum);
    terminate = 1;
}

void osErrorFatal(bool cond, const char *msg, const char *file, int line)
{
   if (!cond) {
     perror(msg);
     fprintf(stderr, "%s:%d\n", file, line);
     exit(EXIT_FAILURE);
   }
}


void obrni_rec(char* niska)
{
    int duzina = strlen(niska);
    int i;
    for(i=0;i<duzina/2;i++)
    {
        char tmp = niska[i];
        niska[i] = niska[duzina-1-i];
        niska[duzina-1-i] = tmp;
    }
    printf("%s\n", niska);
}

void zameni_mala_sa_velikim(char* niska)
{
    int i;
    for(i=0; niska[i]; i++)
    {
        if(islower(niska[i]))
        {
            niska[i] = toupper(niska[i]);
        }
    }
    printf("%s\n", niska);
}