1 files changed, 110 insertions, 0 deletions
diff --git a/lib/mlibc/tests/posix/grp.c b/lib/mlibc/tests/posix/grp.c
new file mode 100644
index 0000000..3d334fe
--- /dev/null
+++ b/lib/mlibc/tests/posix/grp.c
@@ -0,0 +1,110 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <grp.h>
+#include <unistd.h>
+#include <assert.h>
+#include <string.h>
+#include <errno.h>
+#include <stdbool.h>
+
+void check_root_group(struct group *grp) {
+	assert(grp);
+
+	printf("group name: %s\n", grp->gr_name);
+	fflush(stdout);
+
+	assert(grp->gr_gid == 0);
+	assert(!strcmp(grp->gr_name, "root"));
+
+	// Depending on your system, the root group may or may not contain the root user.
+	if (grp->gr_mem[0] != NULL) {
+		bool found = false;
+		for (size_t i = 0; grp->gr_mem[i] != NULL; i++) {
+			printf("group member: %s\n", grp->gr_mem[i]);
+			fflush(stdout);
+
+			if (!strcmp(grp->gr_mem[i], "root")) {
+				found = true;
+				break;
+			}
+		}
+		assert(found);
+	}
+}
+
+int main()
+{
+	struct group grp, *result = NULL;
+	char *buf;
+	size_t bufsize;
+	int s;
+	bool password = false;
+
+	bufsize = sysconf(_SC_GETGR_R_SIZE_MAX);
+	assert(bufsize > 0 && bufsize < 0x100000);
+
+	buf = malloc(bufsize);
+	assert(buf);
+
+	s = getgrnam_r("root", &grp, buf, bufsize, &result);
+	assert(!s);
+	check_root_group(result);
+
+	s = getgrgid_r(0, &grp, buf, bufsize, &result);
+	assert(!s);
+	check_root_group(result);
+
+	result = getgrnam("root");
+	check_root_group(result);
+
+	result = getgrgid(0);
+	check_root_group(result);
+
+	result = getgrnam("this_group_doesnt_exist");
+	assert(!result);
+#ifndef USE_HOST_LIBC
+	// This is not guaranteed.
+	assert(errno == ESRCH);
+#endif
+
+	s = getgrnam_r("this_group_doesnt_exist", &grp, buf, bufsize, &result);
+	assert(!result);
+#ifndef USE_HOST_LIBC
+	// This is not guaranteed.
+	assert(s == ESRCH);
+#endif
+
+	errno = 0;
+	setgrent();
+	assert(errno == 0);
+
+	result = getgrent();
+	assert(result);
+	grp.gr_name = strdup(result->gr_name);
+	if(result->gr_passwd) {
+		password = true;
+	}
+	grp.gr_passwd = strdup(result->gr_passwd);
+	grp.gr_gid = result->gr_gid;
+	assert(grp.gr_name);
+	if(password)
+		assert(grp.gr_passwd);
+
+	assert(grp.gr_name);
+	if(password)
+		assert(grp.gr_passwd);
+
+	endgrent();
+
+	result = getgrent();
+	assert(result);
+	assert(strcmp(result->gr_name, grp.gr_name) == 0);
+	if(password)
+		assert(strcmp(result->gr_passwd, grp.gr_passwd) == 0);
+	assert(result->gr_gid == grp.gr_gid);
+
+	free(grp.gr_name);
+	if(password)
+		free(grp.gr_passwd);
+	free(buf);
+}