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#!/usr/bin/env python3
"""
Prints the registered signals for a Linux process.
"""
import signal, subprocess, sys
keyword = sys.argv[1]
try:
pid = int(keyword)
except ValueError:
pids = subprocess.check_output(["pgrep", keyword],
universal_newlines=True).split()
if len(pids) == 1:
pid = int(pids[0])
else:
if not pids:
print("No such process: %s", keyword)
else:
print("More than one process:", *pids)
sys.exit(1)
def bits(n):
i = 0
while n:
if n & 1:
yield i
n >>= 1
i += 1
def print_sigs(sigset):
# Note 32 and 33 are unusable, those are used by nptl(7):
sigs = {
32: "(NPTL thread cancellation)",
33: "(NPTL POSIX timers)",
}
for name in dir(signal):
if not name.startswith("SIG") or name.startswith("SIG_"):
continue
signum = int(getattr(signal, name))
sigs[signum] = name
for bit in bits(sigset):
signum = bit + 1
if signal.SIGRTMIN < signum <= signal.SIGRTMAX:
signame = "SIGRTMIN+%d" % (signum - signal.SIGRTMIN)
elif signum in sigs:
signame = sigs[signum]
else:
signame = "(signal %d)" % signum
print(" %016x %2d %s" % (1 << bit, signum, signame))
with open("/proc/%d/status" % pid) as f:
for line in f:
if not any(line.startswith("Sig%s" % suffix)
for suffix in ("Pnd", "Blk", "Ign", "Cgt")):
continue
key, val = line.split()
sigset = int(val, 16)
print("%s %016x" % (key, sigset))
print_sigs(sigset)
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