inspect the signal set of every thread in a process (including the main thread) TODO: decode the

ps-signalmask.sh

#!/bin/bash

set -e
set -u

pid=$1

# SigQ                        number of signals queued/max. number for queue
# SigPnd                      bitmap of pending signals for the thread
# ShdPnd                      bitmap of shared pending signals for the process
# SigBlk                      bitmap of blocked signals
# SigIgn                      bitmap of ignored signals
# SigCgt                      bitmap of catched signals

# The strings are generated by render_sigset_t() in
# kernel/sched.c, which looks like this:

# char *render_sigset_t(sigset_t *set, char *buffer) {
#     int i = _NSIG, x;
#     do {
#         i -= 4, x = 0;
# 
#         if (sigismember(set, i+1)) x |= 1;
#         if (sigismember(set, i+2)) x |= 2;
#         if (sigismember(set, i+3)) x |= 4;
#         if (sigismember(set, i+4)) x |= 8;
# 
#         *buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
#     } while (i >= 4);
# 
#     *buffer = 0;
#     return buffer;
# }

for f in /proc/$pid/task/*/status
do
  echo "proc -> $f   "
  egrep '^Name|^Sig|^Shd' $f
done