98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
#define _GNU_SOURCE
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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/prctl.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <glib.h>
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#define pexit(fmt, ...) \
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do { \
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fprintf(stderr, "conmon: " fmt " %m\n", ##__VA_ARGS__); \
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exit(EXIT_FAILURE); \
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} while (0)
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#define nexit(fmt, ...) \
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do { \
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fprintf(stderr, "conmon: " fmt "\n", ##__VA_ARGS__); \
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exit(EXIT_FAILURE); \
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} while (0)
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#define nexit(fmt, ...) \
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do { \
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fprintf(stderr, "conmon: " fmt "\n", ##__VA_ARGS__); \
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exit(EXIT_FAILURE); \
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} while (0)
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#define _cleanup_(x) __attribute__((cleanup(x)))
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static inline void freep(void *p) {
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free(*(void**) p);
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}
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#define _cleanup_free_ _cleanup_(freep)
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int main(int argc, char *argv[])
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{
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int ret;
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const char *cid;
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char cmd[128];
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GError *err = NULL;
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gchar *contents;
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int cpid = -1;
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int status;
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pid_t pid;
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if (argc < 2) {
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nexit("Run as: conmon <id>");
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}
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// Get the container id
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cid = argv[1];
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// Set self as subreaper so we can wait for container process
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// and return its exit code.
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ret = prctl(PR_SET_CHILD_SUBREAPER, 1, 0, 0, 0);
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if (ret != 0) {
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pexit("Failed to set as subreaper");
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}
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snprintf(cmd, 128, "runc create %s --pid-file pidfile", cid);
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ret = system(cmd);
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if (ret != 0) {
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nexit("Failed to create container");
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}
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// Read the pid so we can wait for the process to exit
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g_file_get_contents("pidfile", &contents, NULL, &err);
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if (err) {
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fprintf(stderr, "Failed to read pidfile: %s\n", err->message);
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g_error_free(err);
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exit(1);
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}
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cpid = atoi(contents);
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printf("container PID: %d\n", cpid);
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while ((pid = waitpid(-1, &status, 0)) > 0) {
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printf("PID %d exited\n", pid);
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if (pid == cpid) {
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_cleanup_free_ char *status_str = NULL;
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ret = asprintf(&status_str, "%d", status);
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if (ret < 0) {
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pexit("Failed to allocate memory for status");
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}
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g_file_set_contents("exit", status_str, strlen(status_str), &err);
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if (err) {
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fprintf(stderr, "Failed to write %s to exit file: %s\n", status_str, err->message);
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g_error_free(err);
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exit(1);
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}
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break;
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}
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}
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return EXIT_SUCCESS;
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}
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