This program doesn't terminate when it's run: #include "csapp.h" int main() { int fdsA[2]; int fdsB[2]; char buffer [2]; pid_t pid; Pipe (fdsA); Pipe(fdsB); pid Fork();
This program doesn't terminate when it's run: #include "csapp.h" int main() { int fdsA[2]; int fdsB[2]; char buffer [2]; pid_t pid; Pipe (fdsA); Pipe(fdsB); pid Fork();
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
![This program doesn't terminate when it's run:
#include "csapp.h"
int main() {
}
int fdsA[2];
int fdsB[2];
char buffer [2];
pid_t pid;
Pipe (fdsA);
Pipe(fdsB);
pid= Fork();
if (pid == 0) {
}
Dup2(fdsA[0], 0);
Dup2 (fdsB[1], 1);
printf("hi");
fgets (buffer, 2, stdin);
return 0;
Read(fdsB[0], buffer, 1);
Write(fdsA[1], "ok", 2);
Why?
Waitpid(pid, NULL, 0);
return 0;
fgets(buffer, 2, stdin) reads only one byte from stdin,
so it needs to read the second byte to terminate
file descriptors are not closed as they should be
O the parent and child processes both try to write to
'buffer
"hi" printed by the child process is buffered and
never delivered to a pipe](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc15edfe4-3b5b-4625-b468-6074edf3a169%2F42ae3f3b-2840-4e86-85b6-25d8c1d2cfc9%2F1atnf2q_processed.png&w=3840&q=75)
Transcribed Image Text:This program doesn't terminate when it's run:
#include "csapp.h"
int main() {
}
int fdsA[2];
int fdsB[2];
char buffer [2];
pid_t pid;
Pipe (fdsA);
Pipe(fdsB);
pid= Fork();
if (pid == 0) {
}
Dup2(fdsA[0], 0);
Dup2 (fdsB[1], 1);
printf("hi");
fgets (buffer, 2, stdin);
return 0;
Read(fdsB[0], buffer, 1);
Write(fdsA[1], "ok", 2);
Why?
Waitpid(pid, NULL, 0);
return 0;
fgets(buffer, 2, stdin) reads only one byte from stdin,
so it needs to read the second byte to terminate
file descriptors are not closed as they should be
O the parent and child processes both try to write to
'buffer
"hi" printed by the child process is buffered and
never delivered to a pipe
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