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+NAME="NET-COMMON-TCPIP-MANPAGES-GETIFADDRS">getifaddrs</H1
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+>GETIFADDRS(3) System Library Functions Manual GETIFADDRS(3)
+
+NAME
+ getifaddrs - get interface addresses
+
+SYNOPSIS
+ #include <sys/types.h>
+ #include <sys/socket.h>
+ #include <ifaddrs.h>
+
+ int
+ getifaddrs(struct ifaddrs **ifap);
+
+ void
+ freeifaddrs(struct ifaddrs *ifap);
+
+DESCRIPTION
+ The getifaddrs() function stores a reference to a linked list of the net-
+ work interfaces on the local machine in the memory referenced by ifap.
+ The list consists of ifaddrs structures, as defined in the include file
+ <ifaddrs.h>. The ifaddrs structure contains at least the following
+ entries:
+
+ struct ifaddrs *ifa_next; /* Pointer to next struct */
+ char *ifa_name; /* Interface name */
+ u_int ifa_flags; /* Interface flags */
+ struct sockaddr *ifa_addr; /* Interface address */
+ struct sockaddr *ifa_netmask; /* Interface netmask */
+ struct sockaddr *ifa_broadaddr; /* Interface broadcast address */
+ struct sockaddr *ifa_dstaddr; /* P2P interface destination */
+ void *ifa_data; /* Address specific data */
+
+ ifa_next
+ Contains a pointer to the next structure on the list. This field
+ is set to NULL in last structure on the list.
+
+ ifa_name
+ Contains the interface name.
+
+ ifa_flags
+ Contains the interface flags, as set by ifconfig(8).
+
+ ifa_addr
+ References either the address of the interface or the link level
+ address of the interface, if one exists, otherwise it is NULL.
+ (The sa_family field of the ifa_addr field should be consulted to
+ determine the format of the ifa_addr address.)
+
+ ifa_netmask
+ References the netmask associated with ifa_addr, if one is set,
+ otherwise it is NULL.
+
+ ifa_broadaddr
+ This field, which should only be referenced for non-P2P inter-
+ faces, references the broadcast address associated with ifa_addr,
+ if one exists, otherwise it is NULL.
+
+ ifa_dstaddr
+ References the destination address on a P2P interface, if one
+ exists, otherwise it is NULL.
+
+ ifa_data
+ References address family specific data. For AF_LINK addresses
+ it contains a pointer to the struct if_data (as defined in
+ include file <net/if.h>) which contains various interface
+ attributes and statistics. For all other address families, it
+ contains a pointer to the struct ifa_data (as defined in include
+ file <net/if.h>) which contains per-address interface statistics.
+
+ The data returned by getifaddrs() is dynamically allocated and should be
+ freed using freeifaddrs() when no longer needed.
+
+RETURN VALUES
+ Upon successful completion, a value of 0 is returned. Otherwise, a value
+ of -1 is returned and errno is set to indicate the error.
+
+ERRORS
+ The getifaddrs() may fail and set errno for any of the errors specified
+ for the library routines ioctl(2), socket(2), malloc(3), or sysctl(3).
+
+BUGS
+ If both <net/if.h> and <ifaddrs.h> are being included, <net/if.h> must be
+ included before <ifaddrs.h>.
+
+SEE ALSO
+ ioctl(2), socket(2), sysctl(3), networking(4), ifconfig(8)
+
+HISTORY
+ The getifaddrs() function first appeared in BSDI BSD/OS. The function is
+ supplied on OpenBSD since OpenBSD 2.7.
+
+BSD February 24, 2003 BSD
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