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The host database contains an entry for the name, but it doesn’t have an You try again later, you may succeed then. This condition happens when the name server could not be contacted. Here are the error codes that you may find in h_errno: (It would be cleaner design for theseįunctions to set errno, but use of h_errno is compatible If the name lookup by gethostbyname or gethostbyaddrįails, you can find out the reason by looking at the value of the If the lookup fails, gethostbyaddr returns a null pointer. Internet address, specify a value of AF_INET for an IPv6 format specifies the address format for an IPv4 The length argument is the size (in bytes) of the addressĪt addr. Really a pointer to char - it can be a pointer to an IPv4 or an IPv6Īddress. The gethostbyaddr function returns information about the host The gethostbyname2 function is like gethostbyname, butĪllows the caller to specify the desired address family (e.g.įunction: struct hostent * gethostbyaddr (const void * addr, socklen_t length, int format) ¶ If the lookup fails, it returns a null pointer.įunction: struct hostent * gethostbyname2 (const char * name, int af) ¶ The gethostbyname function returns information about the host | AS-Unsafe dlopen plugin corrupt heap lock You can also use getaddrinfo andįunction: struct hostent * gethostbyname (const char * name) ¶ Statically-allocated structure you must copy the information if you Gethostbyaddr to search the hosts database for information aboutĪ particular host. You can use gethostbyname, gethostbyname2 or Host addresses inĪ struct hostent structure are always given in network byte Implicit assumption that you can convert IPv4 addresses to a
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This is a synonym for h_addr_list in other words, it is theĪs far as the host database is concerned, each address is just a block Might be connected to multiple networks and have different addresses onĮach one.) The vector is terminated by a null pointer. This is the vector of addresses for the host. This is the length, in bytes, of each address. Might find a value in this field other than AF_INET or The database as well as Internet addresses if this were done, you In principle other kinds of addresses could be represented in This is the host address type in practice, its value is always eitherĪF_INET or AF_INET6, with the latter being used for IPv6 These are alternative names for the host, represented as a null-terminated This data type is used to represent an entry in the hosts database. They are BSD features, defined unconditionally if The functions and other symbols for accessing this database are declared The file /etc/hosts or an equivalent provided by a name server. Internally, the system uses a database to keep track of the mappingīetween host names and host numbers. ‘ ’ and other machines in the ‘ gnu.org’ĭomain can refer to it simply as ‘ alpha’. The machine with Internet address ‘ 158.121.106.19’ is also known as
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Symbolic name is that it is usually easier to remember. You can also refer to a host by a symbolic name. Second of all, as my mother always said to me, there’s nothing cooler than being yourself.Previous: Host Address Functions, Up: Host Addresses īesides the standard numbers-and-dots notation for Internet addresses, Alright, first of all-there’s already a popular reggae artist with the name Elephant Man.
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