added sock20

TMP/Practice/04.10/shmat/svshm_string.h

@@ -1,60 +1,26 @@
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <sys/sem.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <sys/ipc.h>
-#include <sys/sem.h>
-#include <unistd.h>
+#include <string.h>
 
-static void
-usage(const char *pname)
-{
-    fprintf(stderr, "Usage: %s [-cx] pathname proj-id num-sems\n",
-            pname);
-    fprintf(stderr, "    -c           Use IPC_CREAT flag\n");
-    fprintf(stderr, "    -x           Use IPC_EXCL flag\n");
-    exit(EXIT_FAILURE);
-}
+#define errExit(msg)        \
+    do                      \
+    {                       \
+        perror(msg);        \
+        exit(EXIT_FAILURE); \
+    } while (0)
 
-int main(int argc, char *argv[])
-{
-    int semid, nsems, flags, opt;
-    key_t key;
+union semun
+{ /* Used in calls to semctl() */
+    int val;
+    struct semid_ds *buf;
+    unsigned short *array;
+#if defined(__linux__)
+    struct seminfo *__buf;
+#endif
+};
 
-    flags = 0;
-    while ((opt = getopt(argc, argv, "cx")) != -1)
-    {
-        switch (opt)
-        {
-        case 'c':
-            flags |= IPC_CREAT;
-            break;
-        case 'x':
-            flags |= IPC_EXCL;
-            break;
-        default:
-            usage(argv[0]);
-        }
-    }
-
-    if (argc != optind + 3)
-        usage(argv[0]);
-
-    key = ftok(argv[optind], argv[optind + 1][0]);
-    if (key == -1)
-    {
-        perror("ftok");
-        exit(EXIT_FAILURE);
-    }
-
-    nsems = atoi(argv[optind + 2]);
-
-    semid = semget(key, nsems, flags | 0600);
-    if (semid == -1)
-    {
-        perror("semget");
-        exit(EXIT_FAILURE);
-    }
-
-    printf("ID = %d\n", semid);
-
-    exit(EXIT_SUCCESS);
-}
+#define MEM_SIZE 4096