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15 Cards in this Set
- Front
- Back
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What system call can we use to create a new process?
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fork()
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What is returned by fork()?
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Zero for child, pid for parent, or -1 for error.
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If fork() returns zero, how do we find the child's pid?
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getpid()
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If fork() returns zero, how do we find the parent's pid?
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getppid()
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If fork() returns an integer greater than zero, how do we find the parent's pid?
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getpid()
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What is returned by getppid() when fork() is a positive integer?
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The pid of the PARENT of the parent process.
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What function can we use to force output to appear?
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fflush(stdout)
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What can we use to separate the outputs from a fork() switching mechanism?
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sleep()
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Will the parent's variables have become available to the child upon fork()?
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Yes, but only a copy.
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Are the child's copies linked to the parent's variables?
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No.
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What function can the parent use to find out whether the child has terminated?
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wait(&status), satisfied by the child's calling of exit()
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What is the use of execve()?
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Requests a new program within a process, overwriting the old instructions and data but keeping the pid.
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What does execve() return on success?
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Nothing.
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What does execve() return on error?
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-1
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After a fork, is execve() normally called from parent or child?
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Child.
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