Created student weenix repository

1 files changed, 44 insertions, 0 deletions

diff --git a/user/bin/sleep.c b/user/bin/sleep.c
new file mode 100644
index 0000000..6b0d485
--- /dev/null
+++ b/user/bin/sleep.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define SECONDS_TO_MICROSECONDS 1000000
+
+void help(int argc, char *argv[])
+{
+    fprintf(stderr, "usage: %s [-u (micrseconds)] <time>\n", argv[0]);
+    exit(1);
+}
+
+int main(int argc, char *argv[])
+{
+    if (argc > 3 || argc == 1)
+    {
+        help(argc, argv);
+    }
+
+    uint64_t tm = 0;
+
+    int use_usec = 0;
+    if (argc > 2)
+    {
+        if (strcmp(argv[1], "-u") == 0)
+        {
+            tm = atoi(argv[2]);
+            use_usec = 1;
+        }
+        else
+        {
+            help(argc, argv);
+        }
+    }
+
+    if (!use_usec)
+    {
+        tm = atoi(argv[1]);
+        tm *= SECONDS_TO_MICROSECONDS;
+    }
+
+    return usleep(tm);
+}
\ No newline at end of file