What documentation shows the associated numbers for linux signals like SIGTERM and SIGKILL?

Question

I can look around the internet and find that the associated number for SIGKILL is 9, but is there linux documentation (such as, a man page) showing the complete list of signals and their numbers?

Answer 1

man 7 signal

Answer 2

The signal(7) man page (at least the one I have) shows multiple possible numbers for some of the signals. If you can get kill to list the numbers, they should be correct for the running system. Try:

kill -l

or

kill -L

In both cases, that's an "ell" (for "list"), not a "one". Bash's built-in kill -l shows a nice numbered table. Linux's procps kill -l shows a terse list of names without numbers, but -L shows a table with the numbers. BSD kill seems to only understand -l, and won't show you the numbers.

Answer 3

Also look in /usr/include/signal.h and either scan the #define or #include statements (which on Ubuntu 10.10 tells you to look in /usr/include/bits/signum.h). Note that the SIGRTMIN/SIGRTMAX are placeholders for kernal and unused signals and should not be called by the shell or a program.