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

IPSEC_STRERROR(3)					   BSD Library Functions Manual 					 IPSEC_STRERROR(3)

NAME
ipsec_strerror -- error messages for the IPsec policy manipulation library
SYNOPSIS
#include <netipsec/ipsec.h> const char * ipsec_strerror();
DESCRIPTION
<netipsec/ipsec.h> declares extern int ipsec_errcode; which is used to pass an error code from IPsec policy manipulation library to a user program. The ipsec_strerror() function can be used to obtain the error message string for the error code. The array pointed to is not to be modified by the program. Since ipsec_strerror() uses strerror(3) as an underlying function, calling strerror(3) after ipsec_strerror() would overwrite the return value from ipsec_strerror() and make it invalid.
RETURN VALUES
The ipsec_strerror() function always returns a pointer to C string. The C string must not be overwritten by the caller.
SEE ALSO
ipsec_set_policy(3)
HISTORY
The ipsec_strerror() function first appeared in WIDE/KAME IPv6 protocol stack kit.
BUGS
The ipsec_strerror() function will return its result which may be overwritten by subsequent calls. ipsec_errcode is not thread safe.
BSD
February 14, 2006 BSD