reentr.h: Add way to see if reentrant used

The reentrant mechanism automatically and silently replaces a given
function by its reentrant version when warranted.  Until now, there was
no direct way to test if it actually happens.  One could infer it,
possibly, but not without the potential for getting it wrong.

Now, for function foo, add #ifdef PERL_REENTR_USING_FOO_R

1 files changed, 133 insertions, 0 deletions

diff --git a/reentr.h b/reentr.h
index 51e19b8f23..b3c3c03946 100644
--- a/reentr.h
+++ b/reentr.h
@@ -22,6 +22,13 @@
  * extensions, but not generally for XS modules unless they
  *    #define PERL_REENTRANT
  * See L<perlxs/Thread-aware system interfaces>.
+ *
+ * For a function 'foo', use the compile-time directive
+ *    #ifdef PERL_REENTR_USING_FOO_R
+ * to test if the function actually did get replaced by the reentrant version.
+ * (If it isn't getting replaced, it might mean it uses a different prototype
+ * on the given platform than any we are expecting.  To fix that, add the
+ * prototype to the __DATA__ section of regen/reentr.pl.)
  */
 
 #ifndef PERL_REENTR_API
@@ -813,6 +820,9 @@ typedef struct {
 #      if !defined(asctime) && ASCTIME_R_PROTO == REENTRANT_PROTO_I_SBI
 #        define asctime(a) (asctime_r(a, PL_reentrant_buffer->_asctime_buffer, PL_reentrant_buffer->_asctime_size) == 0 ? PL_reentrant_buffer->_asctime_buffer : 0)
 #      endif
+#      if defined(asctime)
+#        define PERL_REENTR_USING_ASCTIME_R
+#      endif
 #    endif
 #  endif /* HAS_ASCTIME_R */
 
@@ -826,6 +836,9 @@ typedef struct {
 #      if !defined(crypt) && CRYPT_R_PROTO == REENTRANT_PROTO_B_CCD
 #        define crypt(a, b) crypt_r(a, b, &PL_reentrant_buffer->_crypt_data)
 #      endif
+#      if defined(crypt)
+#        define PERL_REENTR_USING_CRYPT_R
+#      endif
 #    endif
 #  endif /* HAS_CRYPT_R */
 
@@ -836,6 +849,9 @@ typedef struct {
 #      if !defined(ctermid) && CTERMID_R_PROTO == REENTRANT_PROTO_B_B
 #        define ctermid(a) ctermid_r(a)
 #      endif
+#      if defined(ctermid)
+#        define PERL_REENTR_USING_CTERMID_R
+#      endif
 #    endif
 #  endif /* HAS_CTERMID_R */
 
@@ -855,6 +871,9 @@ typedef struct {
 #      if !defined(ctime) && CTIME_R_PROTO == REENTRANT_PROTO_I_SBI
 #        define ctime(a) (ctime_r(a, PL_reentrant_buffer->_ctime_buffer, PL_reentrant_buffer->_ctime_size) == 0 ? PL_reentrant_buffer->_ctime_buffer : 0)
 #      endif
+#      if defined(ctime)
+#        define PERL_REENTR_USING_CTIME_R
+#      endif
 #    endif
 #  endif /* HAS_CTIME_R */
 
@@ -868,6 +887,9 @@ typedef struct {
 #      if !defined(endgrent) && ENDGRENT_R_PROTO == REENTRANT_PROTO_V_H
 #        define endgrent() endgrent_r(&PL_reentrant_buffer->_grent_fptr)
 #      endif
+#      if defined(endgrent)
+#        define PERL_REENTR_USING_ENDGRENT_R
+#      endif
 #    endif
 #  endif /* HAS_ENDGRENT_R */
 
@@ -881,6 +903,9 @@ typedef struct {
 #      if !defined(endhostent) && ENDHOSTENT_R_PROTO == REENTRANT_PROTO_V_D
 #        define endhostent() endhostent_r(&PL_reentrant_buffer->_hostent_data)
 #      endif
+#      if defined(endhostent)
+#        define PERL_REENTR_USING_ENDHOSTENT_R
+#      endif
 #    endif
 #  endif /* HAS_ENDHOSTENT_R */
 
@@ -894,6 +919,9 @@ typedef struct {
 #      if !defined(endnetent) && ENDNETENT_R_PROTO == REENTRANT_PROTO_V_D
 #        define endnetent() endnetent_r(&PL_reentrant_buffer->_netent_data)
 #      endif
+#      if defined(endnetent)
+#        define PERL_REENTR_USING_ENDNETENT_R
+#      endif
 #    endif
 #  endif /* HAS_ENDNETENT_R */
 
@@ -907,6 +935,9 @@ typedef struct {
 #      if !defined(endprotoent) && ENDPROTOENT_R_PROTO == REENTRANT_PROTO_V_D
 #        define endprotoent() endprotoent_r(&PL_reentrant_buffer->_protoent_data)
 #      endif
+#      if defined(endprotoent)
+#        define PERL_REENTR_USING_ENDPROTOENT_R
+#      endif
 #    endif
 #  endif /* HAS_ENDPROTOENT_R */
 
@@ -920,6 +951,9 @@ typedef struct {
 #      if !defined(endpwent) && ENDPWENT_R_PROTO == REENTRANT_PROTO_V_H
 #        define endpwent() endpwent_r(&PL_reentrant_buffer->_pwent_fptr)
 #      endif
+#      if defined(endpwent)
+#        define PERL_REENTR_USING_ENDPWENT_R
+#      endif
 #    endif
 #  endif /* HAS_ENDPWENT_R */
 
@@ -933,6 +967,9 @@ typedef struct {
 #      if !defined(endservent) && ENDSERVENT_R_PROTO == REENTRANT_PROTO_V_D
 #        define endservent() endservent_r(&PL_reentrant_buffer->_servent_data)
 #      endif
+#      if defined(endservent)
+#        define PERL_REENTR_USING_ENDSERVENT_R
+#      endif
 #    endif
 #  endif /* HAS_ENDSERVENT_R */
 
@@ -958,6 +995,9 @@ typedef struct {
 #      if !defined(getgrent) && GETGRENT_R_PROTO == REENTRANT_PROTO_I_SBIH
 #        define getgrent() ((PL_reentrant_retint = getgrent_r(&PL_reentrant_buffer->_grent_struct, PL_reentrant_buffer->_grent_buffer, PL_reentrant_buffer->_grent_size, &PL_reentrant_buffer->_grent_fptr)) == 0 ? &PL_reentrant_buffer->_grent_struct : ((PL_reentrant_retint == ERANGE) ? (struct group *) Perl_reentrant_retry("getgrent") : 0))
 #      endif
+#      if defined(getgrent)
+#        define PERL_REENTR_USING_GETGRENT_R
+#      endif
 #    endif
 #  endif /* HAS_GETGRENT_R */
 
@@ -977,6 +1017,9 @@ typedef struct {
 #      if !defined(getgrgid) && GETGRGID_R_PROTO == REENTRANT_PROTO_S_TSBI
 #        define getgrgid(a) (getgrgid_r(a, &PL_reentrant_buffer->_grent_struct, PL_reentrant_buffer->_grent_buffer, PL_reentrant_buffer->_grent_size) ? &PL_reentrant_buffer->_grent_struct : ((errno == ERANGE) ? (struct group *) Perl_reentrant_retry("getgrgid", a) : 0))
 #      endif
+#      if defined(getgrgid)
+#        define PERL_REENTR_USING_GETGRGID_R
+#      endif
 #    endif
 #  endif /* HAS_GETGRGID_R */
 
@@ -999,6 +1042,9 @@ typedef struct {
 #      if !defined(getgrnam) && GETGRNAM_R_PROTO == REENTRANT_PROTO_S_CSBI
 #        define getgrnam(a) (getgrnam_r(a, &PL_reentrant_buffer->_grent_struct, PL_reentrant_buffer->_grent_buffer, PL_reentrant_buffer->_grent_size) ? &PL_reentrant_buffer->_grent_struct : ((errno == ERANGE) ? (struct group *) Perl_reentrant_retry("getgrnam", a) : 0))
 #      endif
+#      if defined(getgrnam)
+#        define PERL_REENTR_USING_GETGRNAM_R
+#      endif
 #    endif
 #  endif /* HAS_GETGRNAM_R */
 
@@ -1039,6 +1085,9 @@ typedef struct {
 #      if !defined(gethostbyaddr) && GETHOSTBYADDR_R_PROTO == REENTRANT_PROTO_I_TsISBWRE
 #        define gethostbyaddr(a, b, c) ((PL_reentrant_retint = gethostbyaddr_r(a, b, c, &PL_reentrant_buffer->_hostent_struct, PL_reentrant_buffer->_hostent_buffer, PL_reentrant_buffer->_hostent_size, &PL_reentrant_buffer->_hostent_ptr, &PL_reentrant_buffer->_hostent_errno)) == 0 ? PL_reentrant_buffer->_hostent_ptr : ((PL_reentrant_retint == ERANGE) ? (struct hostent *) Perl_reentrant_retry("gethostbyaddr", a, b, c) : 0))
 #      endif
+#      if defined(gethostbyaddr)
+#        define PERL_REENTR_USING_GETHOSTBYADDR_R
+#      endif
 #    endif
 #  endif /* HAS_GETHOSTBYADDR_R */
 
@@ -1055,6 +1104,9 @@ typedef struct {
 #      if !defined(gethostbyname) && GETHOSTBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD
 #        define gethostbyname(a) ((PL_reentrant_retint = gethostbyname_r(a, &PL_reentrant_buffer->_hostent_struct, &PL_reentrant_buffer->_hostent_data)) == 0 ? &PL_reentrant_buffer->_hostent_struct : ((PL_reentrant_retint == ERANGE) ? (struct hostent *) Perl_reentrant_retry("gethostbyname", a) : 0))
 #      endif
+#      if defined(gethostbyname)
+#        define PERL_REENTR_USING_GETHOSTBYNAME_R
+#      endif
 #    endif
 #  endif /* HAS_GETHOSTBYNAME_R */
 
@@ -1080,6 +1132,9 @@ typedef struct {
 #      if !defined(gethostent) && GETHOSTENT_R_PROTO == REENTRANT_PROTO_I_SD
 #        define gethostent() ((PL_reentrant_retint = gethostent_r(&PL_reentrant_buffer->_hostent_struct, &PL_reentrant_buffer->_hostent_data)) == 0 ? &PL_reentrant_buffer->_hostent_struct : ((PL_reentrant_retint == ERANGE) ? (struct hostent *) Perl_reentrant_retry("gethostent") : 0))
 #      endif
+#      if defined(gethostent)
+#        define PERL_REENTR_USING_GETHOSTENT_R
+#      endif
 #    endif
 #  endif /* HAS_GETHOSTENT_R */
 
@@ -1099,6 +1154,9 @@ typedef struct {
 #      if !defined(getlogin) && GETLOGIN_R_PROTO == REENTRANT_PROTO_B_BI
 #        define getlogin() getlogin_r(PL_reentrant_buffer->_getlogin_buffer, PL_reentrant_buffer->_getlogin_size)
 #      endif
+#      if defined(getlogin)
+#        define PERL_REENTR_USING_GETLOGIN_R
+#      endif
 #    endif
 #  endif /* HAS_GETLOGIN_R */
 
@@ -1130,6 +1188,9 @@ typedef struct {
 #      if !defined(getnetbyaddr) && GETNETBYADDR_R_PROTO == REENTRANT_PROTO_I_uISBWRE
 #        define getnetbyaddr(a, b) ((PL_reentrant_retint = getnetbyaddr_r(a, b, &PL_reentrant_buffer->_netent_struct, PL_reentrant_buffer->_netent_buffer, PL_reentrant_buffer->_netent_size, &PL_reentrant_buffer->_netent_ptr, &PL_reentrant_buffer->_netent_errno)) == 0 ? PL_reentrant_buffer->_netent_ptr : ((PL_reentrant_retint == ERANGE) ? (struct netent *) Perl_reentrant_retry("getnetbyaddr", a, b) : 0))
 #      endif
+#      if defined(getnetbyaddr)
+#        define PERL_REENTR_USING_GETNETBYADDR_R
+#      endif
 #    endif
 #  endif /* HAS_GETNETBYADDR_R */
 
@@ -1149,6 +1210,9 @@ typedef struct {
 #      if !defined(getnetbyname) && GETNETBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD
 #        define getnetbyname(a) ((PL_reentrant_retint = getnetbyname_r(a, &PL_reentrant_buffer->_netent_struct, &PL_reentrant_buffer->_netent_data)) == 0 ? &PL_reentrant_buffer->_netent_struct : ((PL_reentrant_retint == ERANGE) ? (struct netent *) Perl_reentrant_retry("getnetbyname", a) : 0))
 #      endif
+#      if defined(getnetbyname)
+#        define PERL_REENTR_USING_GETNETBYNAME_R
+#      endif
 #    endif
 #  endif /* HAS_GETNETBYNAME_R */
 
@@ -1174,6 +1238,9 @@ typedef struct {
 #      if !defined(getnetent) && GETNETENT_R_PROTO == REENTRANT_PROTO_I_SD
 #        define getnetent() ((PL_reentrant_retint = getnetent_r(&PL_reentrant_buffer->_netent_struct, &PL_reentrant_buffer->_netent_data)) == 0 ? &PL_reentrant_buffer->_netent_struct : ((PL_reentrant_retint == ERANGE) ? (struct netent *) Perl_reentrant_retry("getnetent") : 0))
 #      endif
+#      if defined(getnetent)
+#        define PERL_REENTR_USING_GETNETENT_R
+#      endif
 #    endif
 #  endif /* HAS_GETNETENT_R */
 
@@ -1190,6 +1257,9 @@ typedef struct {
 #      if !defined(getprotobyname) && GETPROTOBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD
 #        define getprotobyname(a) (REENTR_MEMZERO(&PL_reentrant_buffer->_protoent_data, sizeof(PL_reentrant_buffer->_protoent_data)),(PL_reentrant_retint = getprotobyname_r(a, &PL_reentrant_buffer->_protoent_struct, &PL_reentrant_buffer->_protoent_data)) == 0 ? &PL_reentrant_buffer->_protoent_struct : ((PL_reentrant_retint == ERANGE) ? (struct protoent *) Perl_reentrant_retry("getprotobyname", a) : 0))
 #      endif
+#      if defined(getprotobyname)
+#        define PERL_REENTR_USING_GETPROTOBYNAME_R
+#      endif
 #    endif
 #  endif /* HAS_GETPROTOBYNAME_R */
 
@@ -1206,6 +1276,9 @@ typedef struct {
 #      if !defined(getprotobynumber) && GETPROTOBYNUMBER_R_PROTO == REENTRANT_PROTO_I_ISD
 #        define getprotobynumber(a) (REENTR_MEMZERO(&PL_reentrant_buffer->_protoent_data, sizeof(PL_reentrant_buffer->_protoent_data)),(PL_reentrant_retint = getprotobynumber_r(a, &PL_reentrant_buffer->_protoent_struct, &PL_reentrant_buffer->_protoent_data)) == 0 ? &PL_reentrant_buffer->_protoent_struct : ((PL_reentrant_retint == ERANGE) ? (struct protoent *) Perl_reentrant_retry("getprotobynumber", a) : 0))
 #      endif
+#      if defined(getprotobynumber)
+#        define PERL_REENTR_USING_GETPROTOBYNUMBER_R
+#      endif
 #    endif
 #  endif /* HAS_GETPROTOBYNUMBER_R */
 
@@ -1225,6 +1298,9 @@ typedef struct {
 #      if !defined(getprotoent) && GETPROTOENT_R_PROTO == REENTRANT_PROTO_I_SD
 #        define getprotoent() (REENTR_MEMZERO(&PL_reentrant_buffer->_protoent_data, sizeof(PL_reentrant_buffer->_protoent_data)),(PL_reentrant_retint = getprotoent_r(&PL_reentrant_buffer->_protoent_struct, &PL_reentrant_buffer->_protoent_data)) == 0 ? &PL_reentrant_buffer->_protoent_struct : ((PL_reentrant_retint == ERANGE) ? (struct protoent *) Perl_reentrant_retry("getprotoent") : 0))
 #      endif
+#      if defined(getprotoent)
+#        define PERL_REENTR_USING_GETPROTOENT_R
+#      endif
 #    endif
 #  endif /* HAS_GETPROTOENT_R */
 
@@ -1250,6 +1326,9 @@ typedef struct {
 #      if !defined(getpwent) && GETPWENT_R_PROTO == REENTRANT_PROTO_I_SBIH
 #        define getpwent() ((PL_reentrant_retint = getpwent_r(&PL_reentrant_buffer->_pwent_struct, PL_reentrant_buffer->_pwent_buffer, PL_reentrant_buffer->_pwent_size, &PL_reentrant_buffer->_pwent_fptr)) == 0 ? &PL_reentrant_buffer->_pwent_struct : ((PL_reentrant_retint == ERANGE) ? (struct passwd *) Perl_reentrant_retry("getpwent") : 0))
 #      endif
+#      if defined(getpwent)
+#        define PERL_REENTR_USING_GETPWENT_R
+#      endif
 #    endif
 #  endif /* HAS_GETPWENT_R */
 
@@ -1269,6 +1348,9 @@ typedef struct {
 #      if !defined(getpwnam) && GETPWNAM_R_PROTO == REENTRANT_PROTO_I_CSBI
 #        define getpwnam(a) ((PL_reentrant_retint = getpwnam_r(a, &PL_reentrant_buffer->_pwent_struct, PL_reentrant_buffer->_pwent_buffer, PL_reentrant_buffer->_pwent_size)) == 0 ? &PL_reentrant_buffer->_pwent_struct : ((PL_reentrant_retint == ERANGE) ? (struct passwd *) Perl_reentrant_retry("getpwnam", a) : 0))
 #      endif
+#      if defined(getpwnam)
+#        define PERL_REENTR_USING_GETPWNAM_R
+#      endif
 #    endif
 #  endif /* HAS_GETPWNAM_R */
 
@@ -1288,6 +1370,9 @@ typedef struct {
 #      if !defined(getpwuid) && GETPWUID_R_PROTO == REENTRANT_PROTO_S_TSBI
 #        define getpwuid(a) (getpwuid_r(a, &PL_reentrant_buffer->_pwent_struct, PL_reentrant_buffer->_pwent_buffer, PL_reentrant_buffer->_pwent_size) ? &PL_reentrant_buffer->_pwent_struct : ((errno == ERANGE) ? (struct passwd *) Perl_reentrant_retry("getpwuid", a) : 0))
 #      endif
+#      if defined(getpwuid)
+#        define PERL_REENTR_USING_GETPWUID_R
+#      endif
 #    endif
 #  endif /* HAS_GETPWUID_R */
 
@@ -1304,6 +1389,9 @@ typedef struct {
 #      if !defined(getservbyname) && GETSERVBYNAME_R_PROTO == REENTRANT_PROTO_I_CCSD
 #        define getservbyname(a, b) (REENTR_MEMZERO(&PL_reentrant_buffer->_servent_data, sizeof(PL_reentrant_buffer->_servent_data)),(PL_reentrant_retint = getservbyname_r(a, b, &PL_reentrant_buffer->_servent_struct, &PL_reentrant_buffer->_servent_data)) == 0 ? &PL_reentrant_buffer->_servent_struct : ((PL_reentrant_retint == ERANGE) ? (struct servent *) Perl_reentrant_retry("getservbyname", a, b) : 0))
 #      endif
+#      if defined(getservbyname)
+#        define PERL_REENTR_USING_GETSERVBYNAME_R
+#      endif
 #    endif
 #  endif /* HAS_GETSERVBYNAME_R */
 
@@ -1320,6 +1408,9 @@ typedef struct {
 #      if !defined(getservbyport) && GETSERVBYPORT_R_PROTO == REENTRANT_PROTO_I_ICSD
 #        define getservbyport(a, b) (REENTR_MEMZERO(&PL_reentrant_buffer->_servent_data, sizeof(PL_reentrant_buffer->_servent_data)),(PL_reentrant_retint = getservbyport_r(a, b, &PL_reentrant_buffer->_servent_struct, &PL_reentrant_buffer->_servent_data)) == 0 ? &PL_reentrant_buffer->_servent_struct : ((PL_reentrant_retint == ERANGE) ? (struct servent *) Perl_reentrant_retry("getservbyport", a, b) : 0))
 #      endif
+#      if defined(getservbyport)
+#        define PERL_REENTR_USING_GETSERVBYPORT_R
+#      endif
 #    endif
 #  endif /* HAS_GETSERVBYPORT_R */
 
@@ -1339,6 +1430,9 @@ typedef struct {
 #      if !defined(getservent) && GETSERVENT_R_PROTO == REENTRANT_PROTO_I_SD
 #        define getservent() (REENTR_MEMZERO(&PL_reentrant_buffer->_servent_data, sizeof(PL_reentrant_buffer->_servent_data)),(PL_reentrant_retint = getservent_r(&PL_reentrant_buffer->_servent_struct, &PL_reentrant_buffer->_servent_data)) == 0 ? &PL_reentrant_buffer->_servent_struct : ((PL_reentrant_retint == ERANGE) ? (struct servent *) Perl_reentrant_retry("getservent") : 0))
 #      endif
+#      if defined(getservent)
+#        define PERL_REENTR_USING_GETSERVENT_R
+#      endif
 #    endif
 #  endif /* HAS_GETSERVENT_R */
 
@@ -1352,6 +1446,9 @@ typedef struct {
 #      if !defined(getspnam) && GETSPNAM_R_PROTO == REENTRANT_PROTO_S_CSBI
 #        define getspnam(a) (getspnam_r(a, &PL_reentrant_buffer->_spent_struct, PL_reentrant_buffer->_spent_buffer, PL_reentrant_buffer->_spent_size) ? &PL_reentrant_buffer->_spent_struct : ((errno == ERANGE) ? (struct spwd *) Perl_reentrant_retry("getspnam", a) : 0))
 #      endif
+#      if defined(getspnam)
+#        define PERL_REENTR_USING_GETSPNAM_R
+#      endif
 #    endif
 #  endif /* HAS_GETSPNAM_R */
 
@@ -1365,6 +1462,9 @@ typedef struct {
 #      if !defined(readdir) && READDIR_R_PROTO == REENTRANT_PROTO_I_TS
 #        define readdir(a) (readdir_r(a, PL_reentrant_buffer->_readdir_struct) == 0 ? PL_reentrant_buffer->_readdir_struct : 0)
 #      endif
+#      if defined(readdir)
+#        define PERL_REENTR_USING_READDIR_R
+#      endif
 #    endif
 #  endif /* HAS_READDIR_R */
 
@@ -1378,6 +1478,9 @@ typedef struct {
 #      if !defined(readdir64) && READDIR64_R_PROTO == REENTRANT_PROTO_I_TS
 #        define readdir64(a) (readdir64_r(a, PL_reentrant_buffer->_readdir64_struct) == 0 ? PL_reentrant_buffer->_readdir64_struct : 0)
 #      endif
+#      if defined(readdir64)
+#        define PERL_REENTR_USING_READDIR64_R
+#      endif
 #    endif
 #  endif /* HAS_READDIR64_R */
 
@@ -1391,6 +1494,9 @@ typedef struct {
 #      if !defined(setgrent) && SETGRENT_R_PROTO == REENTRANT_PROTO_V_H
 #        define setgrent() setgrent_r(&PL_reentrant_buffer->_grent_fptr)
 #      endif
+#      if defined(setgrent)
+#        define PERL_REENTR_USING_SETGRENT_R
+#      endif
 #    endif
 #  endif /* HAS_SETGRENT_R */
 
@@ -1404,6 +1510,9 @@ typedef struct {
 #      if !defined(sethostent) && SETHOSTENT_R_PROTO == REENTRANT_PROTO_V_ID
 #        define sethostent(a) sethostent_r(a, &PL_reentrant_buffer->_hostent_data)
 #      endif
+#      if defined(sethostent)
+#        define PERL_REENTR_USING_SETHOSTENT_R
+#      endif
 #    endif
 #  endif /* HAS_SETHOSTENT_R */
 
@@ -1414,6 +1523,9 @@ typedef struct {
 #      if !defined(setlocale) && SETLOCALE_R_PROTO == REENTRANT_PROTO_I_ICBI
 #        define setlocale(a, b) (setlocale_r(a, b, PL_reentrant_buffer->_setlocale_buffer, PL_reentrant_buffer->_setlocale_size) == 0 ? PL_reentrant_buffer->_setlocale_buffer : 0)
 #      endif
+#      if defined(setlocale)
+#        define PERL_REENTR_USING_SETLOCALE_R
+#      endif
 #    endif
 #  endif /* HAS_SETLOCALE_R */
 
@@ -1427,6 +1539,9 @@ typedef struct {
 #      if !defined(setnetent) && SETNETENT_R_PROTO == REENTRANT_PROTO_V_ID
 #        define setnetent(a) setnetent_r(a, &PL_reentrant_buffer->_netent_data)
 #      endif
+#      if defined(setnetent)
+#        define PERL_REENTR_USING_SETNETENT_R
+#      endif
 #    endif
 #  endif /* HAS_SETNETENT_R */
 
@@ -1440,6 +1555,9 @@ typedef struct {
 #      if !defined(setprotoent) && SETPROTOENT_R_PROTO == REENTRANT_PROTO_V_ID
 #        define setprotoent(a) setprotoent_r(a, &PL_reentrant_buffer->_protoent_data)
 #      endif
+#      if defined(setprotoent)
+#        define PERL_REENTR_USING_SETPROTOENT_R
+#      endif
 #    endif
 #  endif /* HAS_SETPROTOENT_R */
 
@@ -1453,6 +1571,9 @@ typedef struct {
 #      if !defined(setpwent) && SETPWENT_R_PROTO == REENTRANT_PROTO_V_H
 #        define setpwent() setpwent_r(&PL_reentrant_buffer->_pwent_fptr)
 #      endif
+#      if defined(setpwent)
+#        define PERL_REENTR_USING_SETPWENT_R
+#      endif
 #    endif
 #  endif /* HAS_SETPWENT_R */
 
@@ -1466,6 +1587,9 @@ typedef struct {
 #      if !defined(setservent) && SETSERVENT_R_PROTO == REENTRANT_PROTO_V_ID
 #        define setservent(a) setservent_r(a, &PL_reentrant_buffer->_servent_data)
 #      endif
+#      if defined(setservent)
+#        define PERL_REENTR_USING_SETSERVENT_R
+#      endif
 #    endif
 #  endif /* HAS_SETSERVENT_R */
 
@@ -1482,6 +1606,9 @@ typedef struct {
 #      if !defined(strerror) && STRERROR_R_PROTO == REENTRANT_PROTO_B_IBW
 #        define strerror(a) strerror_r(a, PL_reentrant_buffer->_strerror_buffer, PL_reentrant_buffer->_strerror_size)
 #      endif
+#      if defined(strerror)
+#        define PERL_REENTR_USING_STRERROR_R
+#      endif
 #    endif
 #  endif /* HAS_STRERROR_R */
 
@@ -1492,6 +1619,9 @@ typedef struct {
 #      if !defined(tmpnam) && TMPNAM_R_PROTO == REENTRANT_PROTO_B_B
 #        define tmpnam(a) tmpnam_r(a)
 #      endif
+#      if defined(tmpnam)
+#        define PERL_REENTR_USING_TMPNAM_R
+#      endif
 #    endif
 #  endif /* HAS_TMPNAM_R */
 
@@ -1508,6 +1638,9 @@ typedef struct {
 #      if !defined(ttyname) && TTYNAME_R_PROTO == REENTRANT_PROTO_B_IBI
 #        define ttyname(a) ttyname_r(a, PL_reentrant_buffer->_ttyname_buffer, PL_reentrant_buffer->_ttyname_size)
 #      endif
+#      if defined(ttyname)
+#        define PERL_REENTR_USING_TTYNAME_R
+#      endif
 #    endif
 #  endif /* HAS_TTYNAME_R */