mirror of
https://github.com/checkpoint-restore/criu
synced 2025-08-31 06:15:24 +00:00
104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/file.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <linux/limits.h>
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#include "zdtmtst.h"
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const char *test_doc = "Check that 'shared' flocks work";
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const char *test_author = "Pavel Emelyanov <xemul@parallels.com>";
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char *filename;
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TEST_OPTION(filename, string, "file name", 1);
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static int check_file_lock(pid_t pid, pid_t child, int fd, char *expected_type, char *expected_option)
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{
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char buf[100], fl_flag[16], fl_type[16], fl_option[16];
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int found = 0, num, fl_owner;
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FILE *fp_locks = NULL;
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char path[PATH_MAX];
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test_msg("check_file_lock: (pid %d child %d) expecting fd %d type %s option %s\n", pid, child, fd,
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expected_type, expected_option);
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snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
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fp_locks = fopen(path, "r");
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if (!fp_locks) {
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pr_err("Can't open %s\n", path);
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return -1;
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}
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while (fgets(buf, sizeof(buf), fp_locks)) {
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if (strncmp(buf, "lock:\t", 6) != 0)
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continue;
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test_msg("c: %s", buf);
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memset(fl_flag, 0, sizeof(fl_flag));
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memset(fl_type, 0, sizeof(fl_type));
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memset(fl_option, 0, sizeof(fl_option));
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num = sscanf(buf, "%*s %*d:%15s %15s %15s %d", fl_flag, fl_type, fl_option, &fl_owner);
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if (num < 4) {
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pr_perror("Invalid lock info.");
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break;
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}
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if (fl_owner != pid && fl_owner != child)
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continue;
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if (strcmp(fl_flag, "FLOCK"))
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continue;
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if (strcmp(fl_type, expected_type))
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continue;
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if (strcmp(fl_option, expected_option))
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continue;
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found++;
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}
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fclose(fp_locks);
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return found == 1 ? 0 : -1;
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}
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int main(int argc, char **argv)
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{
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int fd, pid, ret = 0;
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test_init(argc, argv);
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fd = open(filename, O_CREAT | O_RDWR, 0600);
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if (fd < 0) {
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pr_perror("No file");
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return -1;
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}
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flock(fd, LOCK_EX);
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pid = fork();
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if (pid == 0) {
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test_waitsig();
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exit(0);
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}
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test_daemon();
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test_waitsig();
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if (check_file_lock(getpid(), pid, fd, "ADVISORY", "WRITE")) {
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fail("Flock file locks check failed");
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ret |= 1;
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}
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if (!ret)
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pass();
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kill(pid, SIGTERM);
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waitpid(pid, NULL, 0);
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close(fd);
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unlink(filename);
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return ret;
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}
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