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GAI_STRERROR(3) FreeBSD 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>:

Name could not be resolved at this time
flags parameter had an invalid value
invalid value for hints
Non-recoverable failure in name resolution
Address family was not recognized
Memory allocation failure
Name does not resolve
argument buffer overflow
Resolved protocol is unknown
Service was not recognized for socket type
Intended socket type was not recognized
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 implementation-specific error message string is returned.

getaddrinfo(3), getnameinfo(3)

RFC 3493
Basic Socket Interface Extensions for IPv6
December 23, 2018 FreeBSD 13.1-RELEASE

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