lib/procutils: improve proc_is_procfs(), add test
* add delay between attempts * zeroize errno and check for EAGAIN (like in other code) * add small test program ./test_procutils --is-procfs [<dir>] Signed-off-by: Karel Zak <kzak@redhat.com>
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@ -245,13 +245,17 @@ int proc_is_procfs(int fd)
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int ret;
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do {
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errno = 0;
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ret = fstatfs(fd, &st);
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} while (ret == -1 && errno == EINTR);
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if (ret == 0)
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return st.f_type == STATFS_PROC_MAGIC;
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else
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return 0;
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if (ret < 0) {
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if (errno != EINTR && errno != EAGAIN)
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return 0;
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xusleep(250000);
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}
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} while (ret != 0);
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return st.f_type == STATFS_PROC_MAGIC;
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}
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#ifdef TEST_PROGRAM_PROCUTILS
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@ -302,10 +306,28 @@ static int test_processes(int argc, char *argv[])
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return EXIT_SUCCESS;
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}
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static int test_isprocfs(int argc, char *argv[])
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{
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const char *name = argc > 1 ? argv[1] : "/proc";
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int fd = open(name, O_RDONLY);
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int is = 0;
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if (fd >= 0) {
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is = proc_is_procfs(fd);
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close(fd);
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} else
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err(EXIT_FAILURE, "cannot open %s", name);
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printf("%s: %s procfs\n", name, is ? "is" : "is NOT");
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return is ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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int main(int argc, char *argv[])
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{
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if (argc < 2) {
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fprintf(stderr, "usage: %1$s --tasks <pid>\n"
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" %1$s --is-procfs [<dir>]\n"
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" %1$s --processes [---name <name>] [--uid <uid>]\n",
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program_invocation_short_name);
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return EXIT_FAILURE;
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@ -315,6 +337,8 @@ int main(int argc, char *argv[])
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return test_tasks(argc - 1, argv + 1);
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if (strcmp(argv[1], "--processes") == 0)
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return test_processes(argc - 1, argv + 1);
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if (strcmp(argv[1], "--is-procfs") == 0)
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return test_isprocfs(argc - 1, argv + 1);
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return EXIT_FAILURE;
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}
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