在 Linux 内核中创建您自己的自定义信号

Question

除了 SIGUSR1 和 SIGUSR2(或任何其他标准信号)之外，我想定义自己的自定义命名信号。 我该怎么办？

Answer 1

http://man7.org/linux/man-pages/man7/signal.7.html指出您可以定义 real time signals - 它们没有预定义的含义。

   The range of supported real-time signals
   is defined by the macros SIGRTMIN and SIGRTMAX.  POSIX.1-2001
   requires that an implementation support at least _POSIX_RTSIG_MAX (8)
   real-time signals.

   The Linux kernel supports a range of 33 different real-time signals,
   numbered 32 to 64.  However, the glibc POSIX threads implementation
   internally uses two (for NPTL) or three (for LinuxThreads) real-time
   signals (see pthreads(7)), and adjusts the value of SIGRTMIN suitably
   (to 34 or 35).  Because the range of available real-time signals
   varies according to the glibc threading implementation (and this
   variation can occur at run time according to the available kernel and
   glibc), and indeed the range of real-time signals varies across UNIX
   systems, programs should never refer to real-time signals using hard-
   coded numbers, but instead should always refer to real-time signals
   using the notation SIGRTMIN+n, and include suitable (run-time) checks
   that SIGRTMIN+n does not exceed SIGRTMAX.

几乎没有什么可添加的:使用 SIGRTMIN+n当SIGRTMIN+n < SIGRTMAX 。对此进行编译时检查(即，如果您需要的信号多于 libc 的实现允许的数量，那么您就有麻烦了)。

例如有类似#define SIGRUBBERDUCK (SIGRTMIN+3)的东西