gettimeofday vs. sys_gettimeofday

OPERATING SYSTEMS I	COMS W4118, Dept of Computer Science, Columbia University

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Topic: gettimeofday vs. sys_gettimeofday

efraser

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posted 09-12-2001 08:42 PM

Anyone,
What is the difference between the system call gettimeofday() and the function sys_gettimeofday(). The Linux kernel book (p154) states "The gettimeofday() system call is imlemented by the sys_gettimeofday() function."
I thought a system call was the 'lowest' you could go without hardware interaction. So, exactly what is sys_gettimeofday()? Function or system call or (if there's such a thing) hardware call?
Novice OS person here, so please explain; do not add to my confusion with acronyms, abbreviations and the sort.

Thanks!

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rvg

Moderator

posted 09-12-2001 09:47 PM

quote:
Originally posted by efraser:
Anyone,
What is the difference between the system call gettimeofday() and the function sys_gettimeofday(). The Linux kernel book (p154) states "The gettimeofday() system call is imlemented by the sys_gettimeofday() function."
I thought a system call was the 'lowest' you could go without hardware interaction. So, exactly what is sys_gettimeofday()? Function or system call or (if there's such a thing) hardware call?
Novice OS person here, so please explain; do not add to my confusion with acronyms, abbreviations and the sort.
Thanks!

Please take a look at Chapter 8: System Calls of the O'Reilly Linux Kernel book. Figure 8-1 on page 235 does a pretty good job of answering your question.

Hope this helps.
Ravi

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