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FreeBSD 11.0 - man page for gai_strerror (freebsd section 3)

GAI_STRERROR(3) 					   BSD Library Functions Manual 					   GAI_STRERROR(3)

gai_strerror -- get error message string from EAI_xxx error code
#include <sys/types.h> #include <sys/socket.h> #include <netdb.h> const char * gai_strerror(int ecode);
The gai_strerror() function returns an error message string corresponding to the error code returned by getaddrinfo(3) or getnameinfo(3). The following error codes and their meaning are defined in <netdb.h>: EAI_AGAIN temporary failure in name resolution EAI_BADFLAGS invalid value for ai_flags EAI_BADHINTS invalid value for hints EAI_FAIL non-recoverable failure in name resolution EAI_FAMILY ai_family not supported EAI_MEMORY memory allocation failure EAI_NONAME hostname or servname not provided, or not known EAI_OVERFLOW argument buffer overflow EAI_PROTOCOL resolved protocol is unknown EAI_SERVICE servname not supported for ai_socktype EAI_SOCKTYPE ai_socktype not supported EAI_SYSTEM system error returned in errno
The gai_strerror() function returns a pointer to the error message string corresponding to ecode. If ecode is out of range, an implementa- tion-specific error message string is returned.
getaddrinfo(3), getnameinfo(3)
May 21, 2006 BSD