Added unistd tests; fixed a lot of unistd bugs and deficiencies.

1 files changed, 101 insertions, 0 deletions

diff --git a/tests/unistd/io.c b/tests/unistd/io.c
new file mode 100644
index 00000000..eeb80373
--- /dev/null
+++ b/tests/unistd/io.c
@@ -0,0 +1,101 @@
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+
+int main() {
+  char readBuffer[256] = {0};
+  char writeBuffer[] = "writeme";
+
+  int fl = open("/folder", O_RDWR);
+  printf("read from folder: %d\n", read(fl, readBuffer, sizeof readBuffer));
+  printf("errno: %d\n", errno);
+  errno = 0;
+  printf("write to folder: %d\n", write(fl, writeBuffer, sizeof writeBuffer));
+  printf("errno: %d\n\n", errno);
+  errno = 0;
+
+  int bd = open("/broken-device", O_RDWR);
+  printf("read from broken device: %d\n", read(bd, readBuffer, sizeof readBuffer));
+  printf("errno: %d\n", errno);
+  errno = 0;
+  printf("write to broken device: %d\n", write(bd, writeBuffer, sizeof writeBuffer));
+  printf("errno: %d\n\n", errno);
+  errno = 0;
+
+  int d = open("/device", O_RDWR);
+  printf("read from device: %d\n", read(d, readBuffer, sizeof readBuffer));
+  printf("data: %s\n", readBuffer);
+  memset(readBuffer, 0, sizeof readBuffer);
+  printf("errno: %d\n", errno);
+  errno = 0;
+  printf("write to device: %d\n", write(d, writeBuffer, sizeof writeBuffer));
+  printf("errno: %d\n\n", errno);
+  errno = 0;
+
+  int f = open("/file", O_RDWR);
+  printf("read from file: %d\n", read(f, readBuffer, sizeof readBuffer));
+  printf("data: %s\n", readBuffer);
+  memset(readBuffer, 0, sizeof readBuffer);
+  printf("errno: %d\n\n", errno);
+  errno = 0;
+
+  printf("seek: %d\n", lseek(f, 3, SEEK_SET));
+  printf("errno: %d\n\n", errno);
+  printf("partial read from file: %d\n", read(f, readBuffer, 3));
+  printf("data: %s\n", readBuffer);
+  memset(readBuffer, 0, sizeof readBuffer);
+  printf("errno: %d\n\n", errno);
+  errno = 0;
+
+  printf("seek: %d\n", lseek(f, -2, SEEK_END));
+  printf("errno: %d\n", errno);
+  errno = 0;
+  printf("partial read from end of file: %d\n", read(f, readBuffer, 3));
+  printf("data: %s\n", readBuffer);
+  memset(readBuffer, 0, sizeof readBuffer);
+  printf("errno: %d\n\n", errno);
+  errno = 0;
+
+  printf("seek: %d\n", lseek(f, -15, SEEK_CUR));
+  printf("errno: %d\n", errno);
+  errno = 0;
+  printf("partial read from before start of file: %d\n", read(f, readBuffer, 3));
+  printf("data: %s\n", readBuffer);
+  memset(readBuffer, 0, sizeof readBuffer);
+  printf("errno: %d\n\n", errno);
+  errno = 0;
+
+  printf("seek: %d\n", lseek(f, 0, SEEK_SET));
+  printf("write to start of file: %d\n", write(f, writeBuffer, 3));
+  printf("errno: %d\n\n", errno);
+  errno = 0;
+
+  printf("seek: %d\n", lseek(f, 0, SEEK_END));
+  printf("write to end of file: %d\n", write(f, writeBuffer, 3));
+  printf("errno: %d\n\n", errno);
+  errno = 0;
+
+  printf("seek: %d\n", lseek(f, 10, SEEK_END));
+  printf("write after end of file: %d\n", write(f, writeBuffer, sizeof writeBuffer));
+  printf("errno: %d\n\n", errno);
+  errno = 0;
+
+  int bytesRead;
+  printf("seek: %d\n", lseek(f, 0, SEEK_SET));
+  printf("read after write: %d\n", bytesRead = read(f, readBuffer, sizeof readBuffer));
+  printf("errno: %d\n", errno);
+  errno = 0;
+  printf("final: ");
+  for (int i = 0; i < bytesRead; i++) {
+    if (readBuffer[i] == 0) {
+      printf("\\0");
+    } else {
+      printf("%c", readBuffer[i]);
+    }
+  }
+  printf("\n");
+
+  return 0;
+}