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Codice: Seleziona tutto

#include <iostream>
#include <string>
#include <cstdlib>
#include <unistd.h>
using namespace std;

//int System(const char *s);
int main()
{
    system("ls");
    return 0;
}

Codice: Seleziona tutto

/* ISO headers */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>

/****** DEBUG and DIE macros *******/

#ifdef DEBUG
#define LOG(...) \
                do \
{ \
                        time_t now = time(NULL); \
                        struct tm *now_s = localtime(&now); \
                        printf("LOG [%02d:%02d:%02d] ", \
                               now_s->tm_hour, now_s->tm_min, now_s->tm_sec); \
                        fflush(stdout); \
                        printf(__VA_ARGS__); \
} while(0)
#else
#define LOG(...)
#endif

/* DIE on error */
#define DIE(...) \
        do \
{ \
                time_t now = time(NULL); \
                struct tm *now_s = localtime(&now); \
                printf("ERR [%02d:%02d:%02d] ", \
                       now_s->tm_hour, now_s->tm_min, now_s->tm_sec); \
                fflush(stdout); \
                printf(__VA_ARGS__); \
                printf("\n==== MAIN CRASH ====\n"); \
                exit(EXIT_FAILURE); \
} while(0)

#define BUFF_LENGTH 128

/**
 * MAIN
 */
int main(int argc, char* argv[])
{
        FILE *program_pipe;
        char *buffer_out, *cmd_line;
        unsigned int max_output_length = 10;

        if(!(buffer_out = malloc(sizeof(char) * BUFF_LENGTH)))
        {
                DIE("malloc buffer failed\n");
        }

        if(!(cmd_line = malloc(sizeof(char) * BUFF_LENGTH)))
        {
                DIE("malloc cmd line failed\n");
        }

        snprintf(cmd_line, BUFF_LENGTH, "dmesg | tail -n %d", max_output_length);

        if(!(program_pipe = popen (cmd_line, "r")))
        {
                DIE("popen failed\n");
        }

        while(fgets(buffer_out, BUFF_LENGTH, program_pipe))
        {
                fprintf(stdout, "%s", buffer_out);

                memset(buffer_out, 0, sizeof(char) * BUFF_LENGTH);
        }

        pclose(program_pipe);

        return EXIT_SUCCESS;
}