ga_clone.lc

unix网络编程卷1：套接口API的全书源码

#include    "gai_hdr.h"##  1 ##src/libgai/ga_clone.c##

/*##  2 ##src/libgai/ga_clone.c##
 * Clone a new addrinfo structure from an existing one.##  3 ##src/libgai/ga_clone.c##
 */##  4 ##src/libgai/ga_clone.c##

/* include ga_clone */
struct addrinfo *##  5 ##src/libgai/ga_clone.c##
ga_clone(struct addrinfo *ai)##  6 ##src/libgai/ga_clone.c##
{##  7 ##src/libgai/ga_clone.c##
    struct addrinfo *new;##  8 ##src/libgai/ga_clone.c##

    if ((new = calloc(1, sizeof(struct addrinfo))) == NULL)##  9 ##src/libgai/ga_clone.c##
        return (NULL);## 10 ##src/libgai/ga_clone.c##

    new->ai_next = ai->ai_next;## 11 ##src/libgai/ga_clone.c##
    ai->ai_next = new;## 12 ##src/libgai/ga_clone.c##

    new->ai_flags = 0;          /* make sure AI_CLONE is off */## 13 ##src/libgai/ga_clone.c##
    new->ai_family = ai->ai_family;## 14 ##src/libgai/ga_clone.c##
    new->ai_socktype = ai->ai_socktype;## 15 ##src/libgai/ga_clone.c##
    new->ai_protocol = ai->ai_protocol;## 16 ##src/libgai/ga_clone.c##
    new->ai_canonname = NULL;## 17 ##src/libgai/ga_clone.c##
    new->ai_addrlen = ai->ai_addrlen;## 18 ##src/libgai/ga_clone.c##
    if ((new->ai_addr = malloc(ai->ai_addrlen)) == NULL)## 19 ##src/libgai/ga_clone.c##
        return (NULL);## 20 ##src/libgai/ga_clone.c##
    memcpy(new->ai_addr, ai->ai_addr, ai->ai_addrlen);## 21 ##src/libgai/ga_clone.c##

    return (new);## 22 ##src/libgai/ga_clone.c##
}## 23 ##src/libgai/ga_clone.c##
/* end ga_clone */