gethostname warning Post: 302318417

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Top Forums Programming gethostname warning Post 302318417 by jim mcnamara on Thursday 21st of May 2009 01:05:17 PM

05-21-2009

Registered User

You have to redesign your code somehow.

gethostbyname() is not guaranteed to work internally the same way on different architectures. If you know the architecure ahead of time, then get the source for gethostbyname for that destination system, and embed it in your code. Otherwise, you will have to figure out what version of gethostbyname you have to run for the box your code is running on, then jump to that routine. ie., include all of your possible versions of the code.

gethostbyname is part of libc, so, for example, for a red hat box try:
libc/inet/

jim mcnamara

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i used stuct hosent h; h=gethostname("google.com"); if(h==NULL) printf("net down"); else printf("net down"); my question hoe this gethostname will verify whether net ia active or inactive i eman whether by usin ping or sending socket . if it is socket which type of socket it is...

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htonl

BYTEORDER(3)						   BSD Library Functions Manual 					      BYTEORDER(3)

NAME

     htonl, htons, ntohl, ntohs -- convert values between host and network byte order

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <arpa/inet.h>

     or

     #include <netinet/in.h>

     uint32_t
     htonl(uint32_t hostlong);

     uint16_t
     htons(uint16_t hostshort);

     uint32_t
     ntohl(uint32_t netlong);

     uint16_t
     ntohs(uint16_t netshort);

DESCRIPTION

     These routines convert 16 and 32 bit quantities between network byte order and host byte order.  On machines which have a byte order which is
     the same as the network order, routines are defined as null macros.

     These routines are most often used in conjunction with Internet addresses and ports as returned by gethostbyname(3) and getservent(3).

SEE ALSO

     gethostbyname(3), getservent(3), byteorder(9)

STANDARDS

     The byteorder functions conform to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY

     The byteorder functions appeared in 4.2BSD.

BUGS

     On the VAX bytes are handled backwards from most everyone else in the world.  This is not expected to be fixed in the near future.

BSD
								  March 20, 2005							       BSD

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htonl