03-28-2008
Did you try the example code at the other end of that link?
inet_addr wants an IP address as a string ("dotted decimal notation", in the parlance), not a host name. Also, you should check its return status, to figure out if something went wrong.
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hi,
I have a problem with a Unix server (SCO Unix version 3.2). If this server is rebooted the own server name and it's IP address is removed from the host table.
How is this possible? How can i solve this problem? (3 Replies)
Discussion started by: FIRE
3 Replies
2. UNIX for Advanced & Expert Users
I am using Tru64UX 5.1a on alphaserver 4100.
Users access the application through Telnet sessions to this server.
My requirement is to limit the users login through their PCs only.
Is there any way I can accomplish this on the unix box ?
I want to include a script in the .profile ( or... (1 Reply)
Discussion started by: shauche
1 Replies
3. Solaris
Hi,
I've got a Sun Solaris machine with host ID (840f8e57) and MAC address (0:14:4f:f:8e:57), how do I:
1. Write the MAC address in standard (IEEE 802) format, i.e. xx-xx-xx-xx-xx-xx? Do I need to add 0's before or after the 'f', i.e. 00-14-4f-0f-8e-57 or 00-14-4f-f0-8e-57?
2. What is... (4 Replies)
Discussion started by: TheBlueSky
4 Replies
4. Solaris
Hi
How to get the IP address / Host name of a particular user connected to Unix Server.
For example: If used 'DevUser1' is connected to Unix server. I need to find out from which PC this connection has been made.
How can this be achieved?
Thanks (6 Replies)
Discussion started by: MVL
6 Replies
5. Solaris
Hi All,
In Ultra 10 at time system is not displaying value for Ethernet address and Host ID.
Also, when i am trying to change the value of environment variables i am getting below message and value is not changing
Thanks (4 Replies)
Discussion started by: kumarmani
4 Replies
6. Programming
I'm trying to write a function to get the host name of any given IP address.
I'm trying to follow this manual but I'm stuck. I'm using gcc and Linux. Any ideas?
getnameinfo()
#include <stdio.h>
#include <netdb.h>
#include <sys/socket.h>
#include <arpa/inet.h>
char... (6 Replies)
Discussion started by: limmer
6 Replies
7. UNIX for Advanced & Expert Users
I do a ssh to remote host(A1) from local host(L1). I then ssh to another remote(A2) from A1.
When I do a who -m from A2, I see the "connected from" as "A1".
=> who -m
userid pts/2 2010-03-27 08:47 (A1)
I want to identify who is the local host who initiated the connection to... (3 Replies)
Discussion started by: gomes1333
3 Replies
8. Red Hat
Hello,
Greetings!!
I have a server with 3 TB of disk space and 12 GB RAM and a i7 processor.
What I did thus far is to install Oracle Enterprise Linux (OEL 5.7)as the host system and install Oracle Virtual box and created 3 VM's. Installed OEL 5.7 on one of the VM, working on installing... (1 Reply)
Discussion started by: rparavastu
1 Replies
9. UNIX for Dummies Questions & Answers
Hi,
In unix or linux is there any command exist to identify Host Name to IP Address or Vice Versa?
Thanks in advance (6 Replies)
Discussion started by: nag_sathi
6 Replies
10. IP Networking
hi,
i want to get the hostname for the specified IP address.
# host www.google.com
www.google.com has address 173.194.69.104
www.google.com has address 173.194.69.105
www.google.com has address 173.194.69.106
www.google.com has address 173.194.69.147
www.google.com has address... (3 Replies)
Discussion started by: kavitha rao
3 Replies
LEARN ABOUT LINUX
inet_addr
INET_ADDR(P) POSIX Programmer's Manual INET_ADDR(P)
NAME
inet_addr, inet_ntoa - IPv4 address manipulation
SYNOPSIS
#include <arpa/inet.h>
in_addr_t inet_addr(const char *cp);
char *inet_ntoa(struct in_addr in);
DESCRIPTION
The inet_addr() function shall convert the string pointed to by cp, in the standard IPv4 dotted decimal notation, to an integer value suit-
able for use as an Internet address.
The inet_ntoa() function shall convert the Internet host address specified by in to a string in the Internet standard dot notation.
The inet_ntoa() function need not be reentrant. A function that is not required to be reentrant is not required to be thread-safe.
All Internet addresses shall be returned in network order (bytes ordered from left to right).
Values specified using IPv4 dotted decimal notation take one of the following forms:
a.b.c.d
When four parts are specified, each shall be interpreted as a byte of data and assigned, from left to right, to the four bytes of an
Internet address.
a.b.c When a three-part address is specified, the last part shall be interpreted as a 16-bit quantity and placed in the rightmost two
bytes of the network address. This makes the three-part address format convenient for specifying Class B network addresses as
"128.net.host" .
a.b When a two-part address is supplied, the last part shall be interpreted as a 24-bit quantity and placed in the rightmost three bytes
of the network address. This makes the two-part address format convenient for specifying Class A network addresses as "net.host" .
a When only one part is given, the value shall be stored directly in the network address without any byte rearrangement.
All numbers supplied as parts in IPv4 dotted decimal notation may be decimal, octal, or hexadecimal, as specified in the ISO C standard
(that is, a leading 0x or 0X implies hexadecimal; otherwise, a leading '0' implies octal; otherwise, the number is interpreted as decimal).
RETURN VALUE
Upon successful completion, inet_addr() shall return the Internet address. Otherwise, it shall return ( in_addr_t)(-1).
The inet_ntoa() function shall return a pointer to the network address in Internet standard dot notation.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
The return value of inet_ntoa() may point to static data that may be overwritten by subsequent calls to inet_ntoa().
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
endhostent() , endnetent() , the Base Definitions volume of IEEE Std 1003.1-2001, <arpa/inet.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
IEEE
/The Open Group 2003 INET_ADDR(P)