On executing the following command
$ grep SIGRTMIN /usr/include/ -r
/usr/include/asm-generic/signal.h:#define SIGRTMIN 32
/usr/include/x86_64-linux-gnu/asm/signal.h:#define SIGRTMIN 32
/usr/include/x86_64-linux-gnu/bits/signum.h:#define SIGRTMIN
(__libc_current_sigrtmin ())
/usr/include/x86_64-linux-gnu/bits/signum.h:#define __SIGRTMIN 32
and checking the source code of glibc-2.19/signal/allocrtsig.c
...
/* Return number of available real-time signal with highest priority. */
int
__libc_current_sigrtmin (void)
{
#ifdef __SIGRTMIN
if (!initialized)
init ();
#endif
return current_rtmin;
}
...
It seems that bash uses the value of current_rtmin
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https://bugs.launchpad.net/bugs/1433155
Title:
bash "kill -l" builtin gives wrong numbers for SIGRTMIN+n signals
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