What are the possible return values of fork?

fork() returns 0 in the child process and positive integer in the parent process. Here, two outputs are possible because the parent process and child process are running concurrently.

Can a fork return 1?

Processes are structured in a directed tree where you only know your single-parent ( getppid() ). In short, fork() returns -1 on error like many other system functions, non-zero value is useful for initiator of the fork call (the parent) to know its new-child pid. Once fork is executed, you have two processes.

Does fork return two values?

fork does not return two values. Right after a fork system call you simply have two independent processes executing the same code, and the returned pid from fork is the only way to distinguish which process are you in – the parent or the child.

Is the fork system call return 1 then it means?

pid_t vfork(void); If fork() is successful, it returns a number of type pid_t which is greater than 0 and represents the PID of the newly created child process. In the child process, fork() returns 0. If fork() fails then its return value will be less than 0.

How the return values of the fork () allow the child and parent processes to perform different activities?

The fork() function is special because it actually returns twice: once to the parent process and once to the child process. In the parent process, fork() returns the pid of the child. In the child process, it returns 0. In the event of an error, no child process is created and -1 is returned to the parent.

What is pid_t in C?

The pid_t data type represents process IDs. The pid_t data type is a signed integer type which is capable of representing a process ID. In the GNU library, this is an int . Function: pid_t getpid (void) The getpid function returns the process ID of the current process.

What is fork return C?

RETURN VALUE Upon successful completion, fork() returns 0 to the child process and returns the process ID of the child process to the parent process. Otherwise, -1 is returned to the parent process, no child process is created, and errno is set to indicate the error.

Can a method return twice?

As per the Java Language Specification, the methods in Java can return only one value at a time. So returning multiple values from a method is theoretically not possible in Java.

What is the return value of fork () system call?

What does PID fork () do?

In the parent process, fork() returns the pid of the child. In the child process, it returns 0. In the event of an error, no child process is created and -1 is returned to the parent. After a successful call to fork() , the child process is basically an exact duplicate of the parent process.

What is the origin of Fork?

Although its origin may go back to Ancient Greece, the personal table fork was most likely invented in the Eastern Roman (Byzantine) Empire, where they were in common use by the 4th century.

What does it mean to fork a process?

In computing, particularly in the context of the Unix operating system and its workalikes, fork is an operation whereby a process creates a copy of itself. It is usually a system call, implemented in the kernel. Fork is the primary (and historically, only) method of process creation on Unix-like operating systems.

What is the function of a fork?

The fork() function is used to create a new process by duplicating the existing process from which it is called. The existing process from which this function is called becomes the parent process and the newly created process becomes the child process.

What does the fork in the road represent?

Fork In The Road. To see a fork in the road in your dream represents an important decision that you need to make. It may indicate your choices or ambivalence about some situation. Alternatively, a fork symbolizes the union of opposites.