How many system calls are there in linux kernel 2.6?

Question

How many system calls are there totally in linux 2.6 kernel. Does the number of system calls vary from version to version.

Answer 1

In the 3.0 (which is not different from 2.6 from that point of view), the file syscall_table.S contains 326 entries.

It is located in arch/m32r/kernel/syscall_table.S.

Answer 2

It varies slightly between architectures. Some architectures have syscalls which are either architecture-specific, or provide different sizes of parameters to the same routine.

Look at the system call table in the version and architecture you're interested in (Aif answered for the "m32r" architecture)

Answer 3

The number varies from version, including minor versions, so there isn't a good hard number to answer to your question. Check this out: http://www.kernel.org/doc/man-pages/online/pages/man2/syscalls.2.html