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(1)void perror(const char *s)
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(2) char *strerror(int errno)
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fprintf(stderr,"error in CreateProcess %s, Process ID %d ",strerror(errno),processID)
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(3)printf("%m", errno);
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#include"stdio.h"
#include "stdlib.h"
#include "errno.h"
#include "netdb.h"
#include "sys/types.h"
#include "netinet/in.h"
int main (int argc, char *argv[])
{
struct hostent *h;
if (argc != 2)
{
fprintf (stderr ,"usage: getip address\n");
exit(1);
}
/* È¡µÃÖ÷»úÐÅÏ¢ */
if((h=gethostbyname(argv[1])) == NULL)
{
/* Èç¹ûgethostbyname ʧ°Ü£¬Ôò¸ø³ö´íÎóÐÅÏ¢ */
herror(“gethostbyname”);
exit(1);
}
/* ÁÐÓ¡³ÌÐòÈ¡µÃµÄÐÅÏ¢ */
printf(“Host name : %s\n”, h->h_name);
printf(“IP Address : %s\n”, inet_ntoa (*((struct in_addr *)h->h_addr))£©;
return 0;
}
/*************************************/
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