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errnoÊÇÒ»¸öÊý×Ö£¬´ú±íµÄ¾ßÌ庬Ò廹Ҫµ½errno.hÖÐÈ¥ÔĶÁºê¶¨Ò壬¶øÃ¿´Î²éÔÄÊÇÒ»¼þºÜ·±ËöµÄÊÂÇé¡£ÓÐÏÂÃæ¼¸ÖÖ·½·¨¿ÉÒÔ·½±ãµÄµÃµ½´íÎóÐÅÏ¢
(1)void perror(const char *s)
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perror ( )ÓÃÀ´½«ÉÏÒ»¸öº¯Êý·¢Éú´íÎóµÄÔ­ÒòÊä³öµ½±ê×¼´íÎó(stderr),²ÎÊýs ËùÖ¸µÄ×Ö·û´®»áÏÈ´òÓ¡³ö,ºóÃæÔÙ¼ÓÉÏ´íÎóÔ­Òò ×Ö·û´®¡£´Ë´íÎóÔ­ÒòÒÀÕÕÈ«¾Ö±äÁ¿ errno µÄÖµÀ´¾ö¶¨ÒªÊä³öµÄ×Ö·û´®¡£
(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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/*×¢£ºÏÂÃæµÄÍ·ÎļþʹÓÃ""¶øÃ»ÓÐÖ±½ÓʹÓüâÀ¨ºÅÊÇÒòΪ²©¿Í´ó°ÍÖмâÀ¨ºÅµ±×÷html·ûºÅ£¬ËùÒÔÆäÄÚ²¿µÄÍ·ÎļþÃû×ֻᱻֱ½ÓºöÂÔ*/
#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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