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How do I know the system call for a particular command?

rated 0 times [ 1] [ 0] / answers: 1 / hits: 2418 / 2 Years ago, thu, october 20, 2022, 1:23:50

I'm new in Ubuntu and I have this question about strace ls command. When I'm run this command it gives all the system calls. What if I need to know the system calls for a specific command, for example if I run the command mkdir? I want to know what are the system calls for this particular command.

Its helps me a lot in my studies. Thank a lot.

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ndeecru

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answered 2 Years ago percol · Accepted Answer

Just like you do strace ls, you should do strace mkdir which will give you list of all calls made by mkdir like as sample below from my PC:

execve("/bin/mkdir", ["mkdir"], [/* 37 vars */]) = 0

brk(0)                                  = 0x83da000

access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)

mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7736000

........

.......

Hope this will solve your problem, but if you want to know about each syscall made then read its man pages or specifically ask about a syscall.