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81d27aa239
This allows pause to reap zombies in the upcoming Shared PID namespace (#1615). Uses the better defined sigaction() instead of signal() for all signals both for consistency (SIGCHLD handler avoids SA_RESTART) and to avoid the implicit signal()->sigaction() translation of various libc versions. Also makes warnings errors and includes a tool to make orphaned zombies for manual testing.
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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static void sigdown(int signo) {
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psignal(signo, "shutting down, got signal");
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exit(0);
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}
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static void sigreap(int signo) {
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while (waitpid(-1, NULL, WNOHANG) > 0);
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}
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int main() {
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if (getpid() != 1) {
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fprintf(stderr, "Warning: pause should be the first process in a pod\n");
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}
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if (sigaction(SIGINT, &(struct sigaction){.sa_handler = sigdown}, NULL) < 0)
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return 1;
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if (sigaction(SIGTERM, &(struct sigaction){.sa_handler = sigdown}, NULL) < 0)
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return 2;
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if (sigaction(SIGCHLD, &(struct sigaction){.sa_handler = sigreap, .sa_flags = SA_NOCLDSTOP}, NULL) < 0)
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return 3;
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sigaction(SIGKILL, &(struct sigaction){.sa_handler = sigdown}, NULL);
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for (;;) pause();
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fprintf(stderr, "error: infinite loop terminated\n");
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return 42;
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}
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