stuff

00-WSLSetup/hello.c

@@ -0,0 +1,35 @@
+/**********************************
+ * hello.c
+ * Written by: H. Welch - 11/26/2006
+ * Modified W. Schilling - 8/15/2009
+ *
+ * Demonstrate basic C-program along with
+ * system call requiring struct and pointer
+ * manipulation.
+ ***********************************/
+ #include <stdio.h>
+ #include <sys/utsname.h>
+ #include <stdlib.h>
+ int main (int argc, char* argv[]) {
+     /* Get system information using the uts system interface.*/
+     /* Declare a buffer to store information about the system. */
+     struct utsname buf;     
+     /* Declare a pointer to the user information. */
+     char *usr;
+     /* Populate the buffer with data from the system. */
+     uname(&buf);
+     /* Get information about the user from the system. */
+     usr=getenv("USER");
+     /* Print out system information to the console. */
+     printf("Hello %s:%s:%s:%s:z%s\n", buf.sysname, buf.nodename,
+          buf.release,buf.version,buf.machine);
+     printf("The size of the UTS structure is %lu.\n", sizeof(buf));
+     /* Print out the user information if the pointer is not NULL. */
+     if (usr != NULL) {
+          printf("%s\n",usr); 
+     } else { 
+          printf("User information not returned by the operating system.");
+     }
+     /* Return to O/S */
+     return 0;
+}