1 files changed, 56 insertions, 0 deletions
diff --git a/tests/fcntl-open/src.c b/tests/fcntl-open/src.c
new file mode 100644
index 00000000..52d2e7e4
--- /dev/null
+++ b/tests/fcntl-open/src.c
@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+
+int main() {
+  struct stat s;
+  int modes[] = {O_RDONLY, O_WRONLY, O_RDWR};
+  char nonexistent_name[] = "/noexist-##";
+
+  for (int i = 0; i < 3; i++) {
+    for (int j = 0; j < 16; j++) {
+      int flags = modes[i];
+      if (j & 0x1) flags |= O_CREAT;
+      if (j & 0x2) flags |= O_EXCL;
+      if (j & 0x4) flags |= O_TRUNC;
+      if (j & 0x8) flags |= O_APPEND;
+
+      printf("EXISTING FILE %d,%d\n", i, j);
+      printf("success: %d\n", open("/test-file", flags, 0777) != -1);
+      printf("errno: %d\n", errno);
+      stat("/test-file", &s);
+      printf("st_mode: 0%o\n", s.st_mode & 037777777000);
+      memset(&s, 0, sizeof s);
+      printf("\n");
+      errno = 0;
+
+      printf("EXISTING FOLDER %d,%d\n", i, j);
+      printf("success: %d\n", open("/test-folder", flags, 0777) != -1);
+      printf("errno: %d\n", errno);
+      stat("/test-folder", &s);
+      printf("st_mode: 0%o\n", s.st_mode & 037777777000);
+      memset(&s, 0, sizeof s);
+      printf("\n");
+      errno = 0;
+
+      nonexistent_name[9] = 'a' + i;
+      nonexistent_name[10] = 'a' + j;
+      printf("NON-EXISTING %d,%d\n", i, j);
+      printf("success: %d\n", open(nonexistent_name, flags, 0777) != -1);
+      printf("errno: %d\n", errno);
+      stat(nonexistent_name, &s);
+      printf("st_mode: 0%o\n", s.st_mode & 037777777000);
+      memset(&s, 0, sizeof s);
+      printf("\n");
+      errno = 0;
+    }
+  }
+
+  printf("CREAT\n");
+  printf("success: %d\n", creat("/creat-me", 0777) != -1);
+  printf("errno: %d\n", errno);
+
+  return 0;
+}