linux内核2.6中有多少个系统调用？

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