htonl, htons, ntohl, ntohs - convert values between host and network byte order
uint32_t htonl(uint32_t hostlong);
uint16_t htons(uint16_t hostshort);
uint32_t ntohl(uint32_t netlong);
uint16_t ntohs(uint16_t netshort);
These functions shall convert 16-bit and 32-bit quantities between network byte order and host byte order.
On some implementations, these functions are defined as macros.
The uint32_t and uint16_t types are defined in <inttypes.h>.
The htonl() and htons() functions shall return the argument value converted from host to network byte order.
The ntohl() and ntohs() functions shall return the argument value converted from network to host byte order.
No errors are defined.
These functions are most often used in conjunction with IPv4 addresses and ports as returned by gethostent() and getservent().
XBD <arpa/inet.h>, <inttypes.h>
First released in Issue 6. Derived from the XNS, Issue 5.2 specification.
return to top of page