convert a string into a numeric Internet address
#include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> unsigned long inet_addr( const char *cp );
The inet_addr() routine converts a string representing an Internet address (for example, ``127.0.0.1'') or a hostname (``ftp.qnx.com'') into a numeric Internet address.
All Internet addresses are returned in network byte order (bytes are ordered from left to right). All network numbers and local address parts are returned as machine-format integer values. For more information on Internet addresses, see inet_aton().
An Internet address, or INADDR_NONE if an error occurs.
POSIX 1003.1g (draft)
| Safety: | |
|---|---|
| Interrupt handler | Yes |
| Signal handler | Yes |
| Thread | Yes |
Although the value INADDR_NONE (0xFFFFFFFF) is a valid broadcast address, inet_addr() always indicates failure when returning that value. The inet_aton() function doesn't share this problem.