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mapping between system calls and libc functions


Hi,

Where can I find the information about mapping between
system calls and glibs functions?

For example, system call open() is redirected to
__open() in libc.  Can I take this as a general rule?

For example, can I assume that all system calls will
be redriected to as follow?

sn: systen call name

rule:
sn -> __sn

Does anyone know where I should look into to get this
information to get 200 some mapping between system
calls and libc functions?

Thank you in advance.

James

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