#include&lt;stdio.h&gt;   #include&lt;fcntl.h&gt;   #include&lt;sys/stat.h&gt;   #include&lt;semaphore.h&gt;&nbsp;   int main&#40;&#41;   &#123;       sem_t* sem_id;       sem_id = sem_open&#40;&quot;sem_value&quot;,O_CREAT,0666,0&#41;;       if&#40;sem_id == SEM_FAILED&#41;           perror&#40;&quot;sem_open&quot;&#41;;       sem_wait&#40;sem_id&#41;;       printf&#40;&quot;Sanfoundry\n&quot;&#41;;       if&#40;sem_close&#40;sem_id&#41; == -1&#41;           perror&#40;&quot;sem_close&quot;&#41;;           return 0;   &#125;
A. this program will print the string “Sanfoundry”
B. this process will block
C. segmentaion fault
D. none of the mentioned
Answer:A
#include&lt;stdio.h&gt;   #include&lt;fcntl.h&gt;   #include&lt;sys/stat.h&gt;   #include&lt;semaphore.h&gt;&nbsp;   int main&#40;&#41;   &#123;       sem_t* sem_id;       sem_id = sem_open&#40;&quot;sem_value&quot;,O_CREAT,0666,0&#41;;       if&#40;sem_id == SEM_FAILED&#41;           perror&#40;&quot;sem_open&quot;&#41;;       sem_wait&#40;sem_id&#41;;       printf&#40;&quot;Sanfoundry\n&quot;&#41;;       if&#40;sem_close&#40;sem_id&#41; == -1&#41;           perror&#40;&quot;sem_close&quot;&#41;;           return 0;   &#125;
A. this program will print the string “Sanfoundry” B. this process will block C. segmentaion fault D. none of the mentioned
Explanation:The initial value of semaphore is 0. As we call the sem_wait() in this program, it blocks the process.