ntohl()

Convert a 32-bit value from network-byte order to host-byte order

Synopsis:

#include <arpa/inet.h>

uint32_t ntohl( uint32_t netlong );

Arguments:

netlong: The value that you want to convert.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The ntohl() function converts a 32-bit value from network-byte order to host-byte order. If a machine's byte order is the same as the network order, this routine is defined as a null macro.

You most often use this routine in conjunction with internet addresses and ports returned by gethostbyname() and getservent().

Returns:

The value in host-byte order.

Classification:

POSIX 1003.1

Safety:
Cancellation point	No
Interrupt handler	Yes
Signal handler	Yes
Thread	Yes

Related links

gethostbyname(), gethostbyname2()
Get a network host entry, given a name
getservent()
Read the next line of network services database file
htonl()
Convert a 32-bit value from host-byte order to network-byte order
htons()
Convert a 16-bit value from host-byte order to network-byte order
ntohs()
Convert a 16-bit value from network-byte order to host-byte order

Last modified: 2013-09-30

comments powered by Disqus

4. Educate yourself

The Documentation tab contains tons of examples, tutorials, and best practices to guide you along the path towards building an awesome app.

The documentation for your preferred focus always appears at the top of the left-hand navigation, but you can still access the rest of the documentation at the bottom.

5. Start developing

The Reference tab is where you'll find essential details about how to use our APIs.

You can use the left-hand navigation to choose how you would like to browse the reference: by module, by topic, or alphabetically. If you have an idea of what you are looking for, start typing it in the Filter box.