Which of the following are true of Unix system calls?

System calls are executed in "User" context.

The routine "malloc" which is used for allocating memory is a system call.

A new file can be created using the "open" system call.

If two processes are executing the "write" system call simultaneously, they are serialized by the operating system.

The "read" system call will never be blocked.

Answer:
The routine "malloc" which is used for allocating memory is a system call.

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