I know that it may invoke one or more systemcalls to implement a POSIX API in Linux, but how to find out which systemcall(s) will been invoked for a specific POSIX API such as memcpy or any other POSIX API?
How can I find out which systemcall(s) that a POSIX API invoked in Linux?
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You can use the strace tool to trace the system calls made by a Linux executable.
You could also inspect the C library source.