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9d2b8d2791
Add the k8s pause binary to `pause/pause.c` and do the plumbing in the Makefile to install it in $libexec/podman/pause/pause. It is intended to replace the k8s pause image and hence the need for network connectivity when creating pods. [NO NEW TESTS NEEDED] since it will be tested in a following commit. Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
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Copyright 2016 The Kubernetes Authors.
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Copyright 2021 The Podman 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 <string.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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#define STRINGIFY(x) #x
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#define VERSION_STRING(x) STRINGIFY(x)
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#ifndef VERSION
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#define VERSION HEAD
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#endif
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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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}
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int main(int argc, char **argv) {
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int i;
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for (i = 1; i < argc; ++i) {
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if (!strcasecmp(argv[i], "-v")) {
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printf("pause.c %s\n", VERSION_STRING(VERSION));
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return 0;
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}
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}
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if (getpid() != 1)
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/* Not an error because pause sees use outside of infra containers. */
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fprintf(stderr, "Warning: pause should be the first process\n");
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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,
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.sa_flags = SA_NOCLDSTOP},
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NULL) < 0)
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return 3;
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for (;;)
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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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