Aggiunte i listati per poter usare le modifiche di Mirko, con la generazione

[gapil.git] / listati / ForkTest.c

diff --git a/listati/ForkTest.c b/listati/ForkTest.c
new file mode 100644 (file)
index 0000000..3ca965f
--- /dev/null
+++ b/listati/ForkTest.c
@@ -0,0 +1,44 @@
+#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 nchild, i;
+    pid_t pid;
+    int wait_child  = 0;
+    int wait_parent = 0;
+    int wait_end    = 0;
+    ...        /* handling options */
+    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) { 
+            /* on error exit */ 
+            printf("Error on %d child creation, %s\n", i+1, strerror(errno));
+            exit(-1); 
+        }
+        if (pid == 0) {   /* child */
+            printf("Child %d successfully executing\n", ++i);
+            if (wait_child) sleep(wait_child);
+            printf("Child %d, parent %d, exiting\n", i, getppid());
+            exit(0);
+        } else {          /* parent */
+            printf("Spawned %d child, pid %d \n", i+1, pid);
+            if (wait_parent) sleep(wait_parent);
+            printf("Go to next child \n");
+        }
+    }
+    /* normal exit */
+    if (wait_end) sleep(wait_end);
+    return 0;
+}