lab10

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<sys/types.h>
#include<string.h>
#include<sys/wait.h>

char* linux_command(char query[]) {
    FILE *pf;
    char line[100];
    char *data = (char *) malloc(sizeof(char) * 512);

    // Setup our pipe for reading and execute our command.
    pf = popen(query,"r");

    // Error handling

    // Get the data from the process execution

    while(fgets(line, 100 , pf))
        strcat(data, line);

    // the data is now in 'data'

    if (pclose(pf) != 0)
        fprintf(stderr," Error: Failed to close command stream \n");

    return data;
}

int main() {
    int fd1[2], fd2[2];

    if (pipe(fd1)==-1) {
        fprintf(stderr, "Pipe Failed" );
        return 1;
    }
    if (pipe(fd2)==-1) {
        fprintf(stderr, "Pipe Failed" );
        return 1;
    }

    pid_t p = fork();

    if(p > 0) {
        char nume[100];

        printf("Introduceti numele utilizatorului: ");
        scanf("%s", nume);

        close(fd1[0]);

        write(fd1[1], nume, strlen(nume)+1);
        close(fd1[1]);

        wait(NULL);

        close(fd2[1]);

        char informations[300];
        read(fd2[0], informations, 300);

        printf("Informatii despre utilizatorul ales:\n%s\n", informations);
        close(fd2[0]);
    }
    else if (p == 0) {
        close(fd1[1]);

        char query[200] = "finger ";
        char nume[100];

        read(fd1[0], nume, 100);

        strcat(query, nume);

        close(fd1[0]);
        close(fd2[0]);

        char *response = linux_command(query);

        write(fd2[1], response, strlen(response)+1);
        close(fd2[1]);

        exit(0);
    }

    return 0;
}