Debugging Question:
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Which one of the following statement is not true about this program?
#include<stdio.h>
#include<pthread.h>

void *fun_t(void *arg);
void *fun_t(void *arg)
{
printf("%dn",getpid());
pthread_exit("Bye");
}
int main()
{
pthread_t pt;
void *res_t;
if(pthread_create(&pt,NULL,fun_t,NULL) != 0)
perror("pthread_create");
if(pthread_join(pt,&res_t) != 0)
perror("pthread_join");
printf("%dn",getpid());
return 0;
}
a) both printf statements will print the same value
b) both printf statements will print the different values
c) this program will print nothing
d) none of the mentioned

Linux Debugging Interview Question
Linux Debugging Interview Question

Answer:

a) both printf statements will print the same value
Explanation:
All the threads of the same process have same PID.
Output:
[root@localhost google]# gcc -o san san.c -lpthread
[root@localhost google]# ./san
12981
12981
[root@localhost google]#

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Previous QuestionNext Question
What is the output of this program no 4?
#include<stdio.h>
#include<pthread.h>

int a;
void *fun_t(void *arg);
void *fun_t(void *arg)
{
a = 20;
pthread_exit("Bye");
}
int main()
{
pthread_t pt;
void *res_t;
a = 10;
if(pthread_create(&pt,NULL,fun_t,NULL) != 0)
perror("pthread_create");
if(pthread_join(pt,&res_t) != 0)
perror("pthread_join");
printf("%dn",a);
return 0;
}
a) 10
b) 20
c) segmentation fault
d) none of the mentioned		What is the output of this program no 6?
#include<stdio.h>
#include<pthread.h>
#include<fcntl.h>

int fd;
void *fun_t(void *arg);
void *fun_t(void *arg)
{
char buff[10];
int count;
count = read(fd,buff,10);
printf("%dn",count);
pthread_exit("Bye");
}
int main()
{
pthread_t pt;
void *res_t;
fd = open("san.c",O_RDONLY);
if(pthread_create(&pt,NULL,fun_t,NULL) != 0)
perror("pthread_create");
if(pthread_join(pt,&res_t) != 0)
perror("pthread_join");
return 0;
}
a) 10
b) 0
c) -1
d) segmentation fault