free.c

UNIX编程高级环境（第二版）的网络套接字部分的程序源码

#include    "db.h"

/* Free up a DB structure, and all the malloc'ed buffers it
 * may point to.  Also close the file descriptors if still open. */

int
_db_free(DB *db)
{
    if (db->idxfd >= 0 && close(db->idxfd) < 0)
        err_dump("index close error");
    if (db->datfd >= 0 && close(db->datfd) < 0)
        err_dump("data close error");
    db->idxfd = db->datfd = -1;

    if (db->idxbuf != NULL)
        free(db->idxbuf);
    if (db->datbuf != NULL)
        free(db->datbuf);
    if (db->name != NULL)
        free(db->name);
    free(db);
    return(0);
}