p4-3.c

UNIX程序设计教程

#include <unistd.h>
void * xmalloc(size_t);
char *readlink_malloc(char *filename)
{
    int size = 100;
    while (1) {
       char *buffer = (char *)xmalloc(size);
       int nchar = readlink(filename, buffer, size);
       if(nchar<size)
         return(buffer);
       free(buffer);
       size *= 2;
    }
}