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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 <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| /* | ||
| Copyright 2016 The Kubernetes Authors. | ||
| Copyright 2021 The Podman Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
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|
||
| #include <signal.h> | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
| #include <sys/types.h> | ||
| #include <sys/wait.h> | ||
| #include <unistd.h> | ||
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||
| #define STRINGIFY(x) #x | ||
| #define VERSION_STRING(x) STRINGIFY(x) | ||
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| #ifndef VERSION | ||
| #define VERSION HEAD | ||
| #endif | ||
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||
| static void sigdown(int signo) { | ||
| psignal(signo, "Shutting down, got signal"); | ||
| exit(0); | ||
| } | ||
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| static void sigreap(int signo) { | ||
| while (waitpid(-1, NULL, WNOHANG) > 0) | ||
| ; | ||
| } | ||
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| int main(int argc, char **argv) { | ||
| int i; | ||
| for (i = 1; i < argc; ++i) { | ||
| if (!strcasecmp(argv[i], "-v")) { | ||
| printf("pause.c %s\n", VERSION_STRING(VERSION)); | ||
| return 0; | ||
| } | ||
| } | ||
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||
| if (getpid() != 1) | ||
| /* Not an error because pause sees use outside of infra containers. */ | ||
| fprintf(stderr, "Warning: pause should be the first process\n"); | ||
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| if (sigaction(SIGINT, &(struct sigaction){.sa_handler = sigdown}, NULL) < 0) | ||
| return 1; | ||
| if (sigaction(SIGTERM, &(struct sigaction){.sa_handler = sigdown}, NULL) < 0) | ||
| return 2; | ||
| if (sigaction(SIGCHLD, &(struct sigaction){.sa_handler = sigreap, | ||
| .sa_flags = SA_NOCLDSTOP}, | ||
| NULL) < 0) | ||
| return 3; | ||
|
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||
| for (;;) | ||
| pause(); | ||
| fprintf(stderr, "Error: infinite loop terminated\n"); | ||
| return 42; | ||
| } |