1 files changed, 68 insertions, 0 deletions
diff --git a/tests/unistd/truncate.c b/tests/unistd/truncate.c
new file mode 100644
index 00000000..18920976
--- /dev/null
+++ b/tests/unistd/truncate.c
@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <string.h>
+
+int main() {
+  struct stat s;
+  int f = open("/towrite", O_WRONLY);
+  int f2 = open("/toread", O_RDONLY);
+  printf("f2: %d\n", f2);
+
+  fstat(f, &s);
+  printf("st_size: %d\n", s.st_size);
+  memset(&s, 0, sizeof s);
+  errno = 0;
+  printf("\n");
+
+  printf("ftruncate(10): %d\n", ftruncate(f, 10));
+  printf("errno: %d\n", errno);
+  fstat(f, &s);
+  printf("st_size: %d\n", s.st_size);
+  memset(&s, 0, sizeof s);
+  errno = 0;
+  printf("\n");
+
+  printf("ftruncate(4): %d\n", ftruncate(f, 4));
+  printf("errno: %d\n", errno);
+  fstat(f, &s);
+  printf("st_size: %d\n", s.st_size);
+  memset(&s, 0, sizeof s);
+  errno = 0;
+  printf("\n");
+
+  printf("ftruncate(-1): %d\n", ftruncate(f, -1));
+  printf("errno: %d\n", errno);
+  fstat(f, &s);
+  printf("st_size: %d\n", s.st_size);
+  memset(&s, 0, sizeof s);
+  errno = 0;
+  printf("\n");
+
+  printf("truncate(2): %d\n", truncate("/towrite", 2));
+  printf("errno: %d\n", errno);
+  stat("/towrite", &s);
+  printf("st_size: %d\n", s.st_size);
+  memset(&s, 0, sizeof s);
+  errno = 0;
+  printf("\n");
+
+  printf("truncate(readonly, 2): %d\n", truncate("/toread", 2));
+  printf("errno: %d\n", errno);
+  stat("/toread", &s);
+  printf("st_size: %d\n", s.st_size);
+  memset(&s, 0, sizeof s);
+  errno = 0;
+  printf("\n");
+
+  printf("ftruncate(readonly, 4): %d\n", ftruncate(f2, 4));
+  printf("errno: %d\n", errno);
+  fstat(f2, &s);
+  printf("st_size: %d\n", s.st_size);
+  memset(&s, 0, sizeof s);
+  errno = 0;
+
+  return 0;
+}