Linux kill signals

Table of Content

• Standard signals
• Signal numbering for standard signals

Standard signals

To get the current active signals applied to your system, you can use man 7 signal to get the right manpage opened.

Linux supports the standard signals listed below. The second column of the table indicates which standard (if any) specified the signal: “P1990” indicates that the signal is described in the original POSIX.1-1990 standard; “P2001” indicates that the signal was added in SUSv2 and POSIX.1-2001.

The signals SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.

Signal numbering for standard signals

To get the current active signals numbering applied to your system, you can use man 7 signal to get the right manpage opened.

The numeric value for each signal is given in the table below. As shown in the table, many signals have different numeric values on different architectures. The first numeric value in each table row shows the signal number on x86, ARM, and most other architectures; the second value is for Alpha and SPARC; the third is for MIPS; and the last is for PARISC. A dash (-) denotes that a signal is absent on the corresponding architecture.