Add a testcase for stat and lstat. (#115)

tests/general/stat.c

@@ -0,0 +1,75 @@
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+int main(int argc, char *argv[]) {
+    if (argc != 2) {
+        fprintf(stderr, "usage: %s <dir>\n", argv[0]);
+        return EXIT_FAILURE;
+    }
+
+    char *filename;
+    int n = asprintf(&filename, "%s/file", argv[1]);
+    assert(n > 0);
+
+    n = creat(filename, S_IRUSR|S_IWUSR);
+    assert(n >= 0);
+
+    char *linkname;
+    n = asprintf(&linkname, "%s/symlink", argv[1]);
+    assert(n > 0);
+
+    n = symlink("file", linkname);
+    assert(n == 0);
+
+    struct stat file_statbuf;
+    struct stat link_statbuf;
+
+    // Test stat.
+
+    n = stat(filename, &file_statbuf);
+    assert(n == 0);
+    assert(file_statbuf.st_size == 0);
+    assert(S_ISREG(file_statbuf.st_mode));
+
+    n = stat(linkname, &link_statbuf);
+    assert(n == 0);
+    assert(link_statbuf.st_size == 0);
+    assert(S_ISREG(link_statbuf.st_mode));
+
+    assert(file_statbuf.st_dev == link_statbuf.st_dev);
+
+    // Clear out the access time fields, and they should be the same.
+    memset(&file_statbuf.st_atim, 0, sizeof(struct timespec));
+    memset(&link_statbuf.st_atim, 0, sizeof(struct timespec));
+    assert(memcmp(&file_statbuf, &link_statbuf, sizeof(struct stat)) == 0);
+
+    // Test lstat.
+
+    n = lstat(filename, &file_statbuf);
+    assert(n == 0);
+    assert(file_statbuf.st_size == 0);
+    assert(S_ISREG(file_statbuf.st_mode));
+
+    n = lstat(linkname, &link_statbuf);
+    assert(n == 0);
+    assert(link_statbuf.st_size != 0);
+    assert(S_ISLNK(link_statbuf.st_mode));
+
+    assert(file_statbuf.st_dev == link_statbuf.st_dev);
+    assert(link_statbuf.st_ino != file_statbuf.st_ino);
+
+    n = unlink(filename);
+    assert(n == 0);
+    n = unlink(linkname);
+    assert(n == 0);
+
+    free(filename);
+    free(linkname);
+
+    return 0;
+}

tests/testcase.sh

@@ -48,9 +48,18 @@ else
     env=""
 fi
 
+# Determine a preopened directory to provide.
+if [ -e "$input.dir" ]; then
+    dir="--dir $input.dir"
+    dirarg="$input.dir"
+else
+    dir=""
+    dirarg=""
+fi
+
 # Run the test, capturing stdout, stderr, and the exit status.
 exit_status=0
-"$runwasi" $env "$wasm" \
+"$runwasi" $env $dir "$wasm" $dirarg \
     < "$stdin" \
     > "$stdout_observed" \
     2> "$stderr_observed" \