This set of Linux Debugging questions and answers focuses on Internet Domain Socket System Calls. 1. What is the output of this program? #include<stdio.h> #include<sys/types.h> #include<sys/socket.h> int main() { struct sockaddr_in addr; int fd; fd = socket(AF_INET,SOCK_STREAM,0); printf("%d\n",fd); return 0; } a) -1 b) 3 c) error d) none of the mentioned 2. What is … Read more
This set of Linux Debugging questions and answers focuses on Unix Domain Sockets. 1. What is the output of this program? #include<stdio.h> int main() { int fd_socket; fd_socket = socket(AF_UNIX,SOCK_STREAM,0); printf("%d\n",fd_socket); return 0; } a) -1 b) 0 c) any integer value d) none of the mentioned 2. In this program, the third argument of … Read more
This set of Linux Debugging questions and answers focuses on POSIX IPCs i.e. Message Queues, Shared Memory and Semaphores. 1. What is the output of this program? #include<stdio.h> #include<stdlib.h> #include<string.h> #include<sys/types.h> #include<sys/ipc.h> #include<sys/msg.h> struct data_st{ long int id; char buff[11]; }; int main() { int m_id; struct data_st data1, data2; m_id = msgget((key_t)181,0666|IPC_CREAT); if(m_id == … Read more
This set of Linux Debugging questions and answers focuses on the System-V IPCs i.e. Message Queues, Shared Memory and Semaphores. 1. What is the output of this program? #include<stdio.h> #include<fcntl.h> #include<sys/stat.h> #include<semaphore.h> int main() { sem_t* sem_id; sem_id = sem_open("sem_value",O_CREAT,0666,0); if(sem_id == SEM_FAILED) perror("sem_open"); sem_wait(sem_id); printf("Sanfoundry\n"); if(sem_close(sem_id) == -1) perror("sem_close"); return 0; } a) this … Read more
This set of Linux Debugging questions and answers focuses on Named and Un-named Pipe Calls. 1. What is the output of this program? #include<stdio.h> #include<string.h> int main() { int fd[2]; int count; char buffer[6]; if( pipe(fd) != 0) perror("pipe"); memset(buffer,’\0′,6); count=write(fd[1],"Linux",6); read(fd[0],buffer,6); printf("%s\n",buffer); return 0;put } a) this program will print the string “Linux” b) … Read more
This set of Tricky and Buggy questions and answers focuses on PThreads handling. 1. What is the output of this program #include<stdio.h> #include<pthread.h> void *fun_t(void *arg); void *fun_t(void *arg) { pthread_exit("Bye"); } int main() { pthread_t pt; void *res_t; int ret; ret = pthread_join(pt,&res_t); printf("%d\n",ret); return 0; } a) 0 b) -1 c) 2 d) … Read more
This set of Linux Debugging questions and answers focuses on Posix Threads. 1. Which one of the following string will print first by this program? #include<stdio.h> #include<pthread.h> void *fun_t(void *arg); void *fun_t(void *arg) { printf("Sanfoundry\n"); pthread_exit("Bye"); } int main() { pthread_t pt; void *res_t; if(pthread_create(&pt,NULL,fun_t,NULL) != 0) perror("pthread_create"); printf("Linux\n"); if(pthread_join(pt,&res_t) != 0) perror("pthread_join"); return 0; … Read more
This set of Linux Debugging questions and answers focuses on Timer, User and Resource Limit System Calls. 1. This program will print the #include<stdio.h> #include<unistd.h> int main() { long int value; value = sysconf(_SC_CHILD_MAX); printf("%ld\n",value); return 0; } a) maximum number of simultaneous processes per user id b) maximum number of child processes of the … Read more
This set of Linux Debugging questions and answers focuses on signal handling System Calls. 1. What will happen as we press the “Ctrl+c” key after running this program? #include<stdio.h> #include<signal.h> void response (int); void response (int sig_no) { printf("Linux\n"); } int main() { signal(SIGINT,response); while(1){ printf("Sanfoundry\n"); sleep(1); } return 0; } a) the string “Linux” … Read more
This set of Linux Debugging questions and answers focuses on the fork, exec and wait System Calls. 1. What is the output of this program? #include<stdio.h> int main() { fork(); printf("Sanfoundry\n"); return 0; } a) the string “Sanfoundry” will print 1 time b) the string “Sanfoundry” will print 2 times c) the string “Sanfoundry” will … Read more
