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Alarm: - Coggle Diagram
Alarm:
- The time_interval argument is the number of CPU seconds elapse time,
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- If a time_interval value is zero, it turns off the alarm clock.
- The return value of the alarm API is the number of CPU seconds left in the
process timer, as set by a previous alarm system call
- The effect of the previous alarm API call is canceled, and the process timer
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- A process alarm clock is not passed on to its forked child process, but an
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- The alarm API can be called by a process to request the kernel to send the
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- The alarm API is defined in most UNIX systems and is a POSIX. 1 standard.
- The function prototype of the API is as: I
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10 The sleep function above sets up a signal handler for the SIGALRM, calls
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interval, and finally, suspends its execution via the pause system call
- The wakeup signal handler function is called when the SIGALRM signal
is sent io the process. When it returns, the pause system call will be aborted,
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- BSD UNIX defines the ualarm function, which is the same as the alarm
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