Messi anlcuni nuovi esempi. E messa la GPL negli esempi.

[gapil.git] / sources / ForkTest.c

diff --git a/sources/ForkTest.c b/sources/ForkTest.c
new file mode 100644 (file)
index 0000000..da38629
--- /dev/null
+++ b/sources/ForkTest.c
@@ -0,0 +1,95 @@
+/****************************************************************
+ *
+ * Program ForkTest.c: 
+ * Program to test process creation
+ *
+ * Author: Simone Piccardi
+ * Sep. 2001
+ *
+ * Usage: forktest -h give all info's
+ *
+ * $Id: ForkTest.c,v 1.1 2001/09/09 17:39:15 piccardi Exp $
+ *
+ ****************************************************************/
+/* 
+ * Include needed headers
+ */
+#include <errno.h>       /* error definitions and routines */ 
+#include <stdlib.h>      /* C standard library */
+#include <unistd.h>      /* unix standard library */
+#include <stdio.h>      /* standard I/O library */
+#include <string.h>      /* string functions */
+
+/* Help printing routine */
+void usage(void);
+
+int main(int argc, char *argv[])
+{
+/* 
+ * Variables definition  
+ */
+    int i;
+    int nchild;
+    pid_t pid;
+    /*
+     * Input section: decode command line parameters 
+     * Use getopt function
+     */
+    opterr = 0;         /* don't want writing to stderr */
+    while ( (i = getopt(argc, argv, "h")) != -1) {
+       switch (i) {
+       /* 
+        * Handling options 
+        */ 
+       case 'h':  
+           printf("Wrong -h option use\n");
+           usage();
+           return(0);
+           break;
+       case '?':   /* unrecognized options */
+           printf("Unrecognized options -%c\n",optopt);
+           usage();
+       default:    /* should not reached */
+           usage();
+       }
+    }
+    /* ***********************************************************
+     * 
+     *          Options processing completed
+     *
+     *               Main code beginning
+     * 
+     * ***********************************************************/
+    /* There must be remaing parameters */
+    if (optind == argc) {
+       usage();
+    }
+    nchild = atoi(argv[optind]);
+    printf("Test for forking %d child\n", nchild);
+    /* loop to fork children */
+    for (i=0; i<nchild; i++) {
+       if ( (pid = fork()) < 0) {
+           printf("Error on %d child creation, %s\n", i, strerror(errno));
+       }
+       if (pid == 0) {   /* child */
+           printf("Child %d successfully executing\n", i++);
+           sleep(2);
+           printf("Child %d exiting\n", i);
+           exit(0);
+       } else {          /* parent */
+           printf("Spawned %d child, pid %d \n", i, pid);
+       }
+    }
+    /* normal exit */
+    return 0;
+}
+/*
+ * routine to print usage info and exit
+ */
+void usage(void) {
+    printf("Program forktest: fork a given number of child \n");
+    printf("Usage:\n");
+    printf("  forktest [-h] child to fork \n");
+    printf("  -h          print this help\n");
+    exit(1);
+}