1 files changed, 101 insertions, 0 deletions

diff --git a/examples/test.c b/examples/test.c
new file mode 100644
index 0000000..44dc307
--- /dev/null
+++ b/examples/test.c
@@ -0,0 +1,101 @@
+/* test.c
+
+   Experiments with syscalls
+   argc < 2            Print Hello World
+   argv[1][0] == 'p'   print argv[2]
+              == 'e'   Exec Test
+              == 'f'   File test
+              == 'F'   File descriptor stress test
+              == 'h'   Halt
+              == '0'   Null-Pointer Access
+*/
+
+#include <stdio.h>
+#include <syscall.h>
+
+#define LARGE_BUF_SIZE 4150
+char  large_buf[LARGE_BUF_SIZE];
+
+#define NUM_EXEC_CHILDS 7
+char *execs[NUM_EXEC_CHILDS] = { "test", "test p FOO", "test p BAR", "test f", "test 0", &large_buf[0], "test^" };
+
+#define MAX_FD 4097
+
+static void init_args(void);
+static void init_args()
+{
+    int i = 0;
+    char *t = "";
+    while(i < LARGE_BUF_SIZE-1) {
+      if(!*t) t = "test ";
+      large_buf[i++] = *t++;
+    }
+    large_buf[LARGE_BUF_SIZE-1]='\0';
+}
+
+int
+main (int argc, char** argv)
+{
+    if(argc < 2) {
+        printf("Hello World!\n");
+        exit(0);
+    }
+    init_args();
+    if(argv[1][0] == 'e') {
+        int r = 0;
+        int i;
+        int tid[NUM_EXEC_CHILDS];
+
+        for(i = 0; i < NUM_EXEC_CHILDS; i++) {
+            tid[i] = exec(execs[i]);
+        }
+        for(i = 0; i < NUM_EXEC_CHILDS; i++) {
+            if (tid[i] >= 0) {
+                r = wait(tid[i]);
+                printf("P child %d exited with exit code %d\n",i, r);
+            } else {
+                printf("P child %d failed to start\n", i);
+            }
+        }
+    } else if(argv[1][0] == 'f') {
+        char buf[10];
+        int r;
+        create ("test.txt", 10);
+        int handle = open ("test.txt");
+        if (handle < 2)
+            printf ("open(test.txt) returned %d", handle);
+        if ((r=write(handle,"987654321",10)) != 10) {
+            printf("write failed: %d not %d\n",r,10);
+            exit(1);
+        }
+        seek(handle,0);
+        if ((r=read(handle, buf, 10)) != 10) {
+            printf("read failed: %d not %d\n",r,10);
+            exit(1);
+        }
+        printf("test.txt: %s\n", buf);
+    } else if(argv[1][0] == 'F') {
+        int j,i;
+        create ("foo.txt", 10);
+        for (j = 0; j < 5; j++) {
+            for (i = 2; i <= MAX_FD; i++) {
+                if (open ("foo.txt") < 0) {
+                    printf("Opening the %d's file failed\n",i-2);
+                    break;
+                }
+            }
+            while(--i >= 2) {
+                close (i);
+            }
+        }
+    } else if(argv[1][0] == '0') {
+        printf("Null pointer value is: %d\n",*((int*)NULL));
+    } else if(argv[1][0] == 'h') {
+        halt();
+    } else if(argv[1][0] == 'p' && argc >= 3) {
+        printf("%s\n", argv[2]);
+    } else {
+        printf("ARGV[1] is %s\n", argv[1]);
+    }
+    return 0;
+}