htonl(3) - f38

1BYTEORDER(3)               Library Functions Manual               BYTEORDER(3)
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NAME

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

10       Standard C library (libc, -lc)
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SYNOPSIS

13       #include <arpa/inet.h>
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15       uint32_t htonl(uint32_t hostlong);
16       uint16_t htons(uint16_t hostshort);
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18       uint32_t ntohl(uint32_t netlong);
19       uint16_t ntohs(uint16_t netshort);
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DESCRIPTION

22       The htonl() function converts the unsigned integer hostlong  from  host
23       byte order to network byte order.
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25       The htons() function converts the unsigned short integer hostshort from
26       host byte order to network byte order.
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28       The ntohl() function converts the unsigned integer netlong from network
29       byte order to host byte order.
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31       The  ntohs() function converts the unsigned short integer netshort from
32       network byte order to host byte order.
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34       On the i386 the host  byte  order  is  Least  Significant  Byte  first,
35       whereas  the  network byte order, as used on the Internet, is Most Sig‐
36       nificant Byte first.
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ATTRIBUTES

39       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
40       tributes(7).
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42       ┌────────────────────────────────────────────┬───────────────┬─────────┐
43       │Interface                                   │ Attribute     │ Value   │
44       ├────────────────────────────────────────────┼───────────────┼─────────┤
45       │htonl(), htons(), ntohl(), ntohs()          │ Thread safety │ MT-Safe │
46       └────────────────────────────────────────────┴───────────────┴─────────┘
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STANDARDS

49       POSIX.1-2008.
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HISTORY

52       POSIX.1-2001.
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