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perl/reentr.c
Karl Williamson df145d8b76 regen/reentr.pl: Update copyright year
2024-02-28 06:44:29 -07:00

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/* -*- mode: C; buffer-read-only: t -*-
*
* reentr.c
*
* Copyright (C) 2002, 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011,
* 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023,
* 2024 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
* !!!!!!! DO NOT EDIT THIS FILE !!!!!!!
* This file is built by regen/reentr.pl from data in regen/reentr.pl.
* Any changes made here will be lost!
*/
/*
* "Saruman," I said, standing away from him, "only one hand at a time can
* wield the One, and you know that well, so do not trouble to say we!"
*
* [p.260 of _The Lord of the Rings_, II/ii: "The Council of Elrond"]
*/
/*
* This file contains a collection of automatically created wrappers
* (created by running reentr.pl) for reentrant (thread-safe) versions of
* various library calls, such as getpwent_r. The wrapping is done so
* that other files like pp_sys.c calling those library functions need not
* care about the differences between various platforms' idiosyncrasies
* regarding these reentrant interfaces.
*/
#include "EXTERN.h"
#define PERL_IN_REENTR_C
#include "perl.h"
#include "reentr.h"
#include "keywords.h"
#define RenewDouble(data_pointer, size_pointer, type) \
STMT_START { \
const size_t size = MAX(*(size_pointer), 1) * 2; \
Renew((data_pointer), (size), type); \
*(size_pointer) = size; \
} STMT_END
void
Perl_reentrant_size(pTHX) {
PERL_UNUSED_CONTEXT;
/* Set the sizes of the reentrant buffers */
#ifdef USE_REENTRANT_API
# define REENTRANTSMALLSIZE 256 /* Make something up. */
# define REENTRANTUSUALSIZE 4096 /* Make something up. */
# ifdef HAS_ASCTIME_R
PL_reentrant_buffer->_asctime_size = 26;
# endif /* HAS_ASCTIME_R */
# ifdef HAS_CRYPT_R
# endif /* HAS_CRYPT_R */
# ifdef HAS_CTIME_R
PL_reentrant_buffer->_ctime_size = 26;
# endif /* HAS_CTIME_R */
# ifdef HAS_GETGRNAM_R
# if defined(HAS_SYSCONF) && defined(_SC_GETGR_R_SIZE_MAX) && !defined(__GLIBC__)
PL_reentrant_buffer->_grent_size = sysconf(_SC_GETGR_R_SIZE_MAX);
if (PL_reentrant_buffer->_grent_size == (size_t) -1)
PL_reentrant_buffer->_grent_size = REENTRANTUSUALSIZE;
# elif defined(__osf__) && defined(__alpha) && defined(SIABUFSIZ)
PL_reentrant_buffer->_grent_size = SIABUFSIZ;
# elif defined(__sgi)
PL_reentrant_buffer->_grent_size = BUFSIZ;
# else
PL_reentrant_buffer->_grent_size = REENTRANTUSUALSIZE;
# endif
# endif /* HAS_GETGRNAM_R */
# ifdef HAS_GETHOSTBYNAME_R
# if !(GETHOSTBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
PL_reentrant_buffer->_hostent_size = REENTRANTUSUALSIZE;
# endif
# endif /* HAS_GETHOSTBYNAME_R */
# ifdef HAS_GETLOGIN_R
PL_reentrant_buffer->_getlogin_size = REENTRANTSMALLSIZE;
# endif /* HAS_GETLOGIN_R */
# ifdef HAS_GETNETBYNAME_R
# if !(GETNETBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
PL_reentrant_buffer->_netent_size = REENTRANTUSUALSIZE;
# endif
# endif /* HAS_GETNETBYNAME_R */
# ifdef HAS_GETPROTOBYNAME_R
# if !(GETPROTOBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
PL_reentrant_buffer->_protoent_size = REENTRANTUSUALSIZE;
# endif
# endif /* HAS_GETPROTOBYNAME_R */
# ifdef HAS_GETPWNAM_R
# if defined(HAS_SYSCONF) && defined(_SC_GETPW_R_SIZE_MAX) && !defined(__GLIBC__)
PL_reentrant_buffer->_pwent_size = sysconf(_SC_GETPW_R_SIZE_MAX);
if (PL_reentrant_buffer->_pwent_size == (size_t) -1)
PL_reentrant_buffer->_pwent_size = REENTRANTUSUALSIZE;
# elif defined(__osf__) && defined(__alpha) && defined(SIABUFSIZ)
PL_reentrant_buffer->_pwent_size = SIABUFSIZ;
# elif defined(__sgi)
PL_reentrant_buffer->_pwent_size = BUFSIZ;
# else
PL_reentrant_buffer->_pwent_size = REENTRANTUSUALSIZE;
# endif
# endif /* HAS_GETPWNAM_R */
# ifdef HAS_GETSERVBYNAME_R
# if !(GETSERVBYNAME_R_PROTO == REENTRANT_PROTO_I_CCSD)
PL_reentrant_buffer->_servent_size = REENTRANTUSUALSIZE;
# endif
# endif /* HAS_GETSERVBYNAME_R */
# ifdef HAS_GETSPNAM_R
# if defined(HAS_SYSCONF) && defined(_SC_GETPW_R_SIZE_MAX) && !defined(__GLIBC__)
PL_reentrant_buffer->_spent_size = sysconf(_SC_GETPW_R_SIZE_MAX);
if (PL_reentrant_buffer->_spent_size == (size_t) -1)
PL_reentrant_buffer->_spent_size = REENTRANTUSUALSIZE;
# elif defined(__osf__) && defined(__alpha) && defined(SIABUFSIZ)
PL_reentrant_buffer->_spent_size = SIABUFSIZ;
# elif defined(__sgi)
PL_reentrant_buffer->_spent_size = BUFSIZ;
# else
PL_reentrant_buffer->_spent_size = REENTRANTUSUALSIZE;
# endif
# endif /* HAS_GETSPNAM_R */
# ifdef HAS_GMTIME_R
# endif /* HAS_GMTIME_R */
# ifdef HAS_LOCALTIME_R
# endif /* HAS_LOCALTIME_R */
# ifdef HAS_READDIR_R
/* This is the size Solaris recommends.
* (though we go static, should use pathconf() instead) */
PL_reentrant_buffer->_readdir_size = sizeof(struct dirent) + MAXPATHLEN + 1;
# endif /* HAS_READDIR_R */
# ifdef HAS_READDIR64_R
/* This is the size Solaris recommends.
* (though we go static, should use pathconf() instead) */
PL_reentrant_buffer->_readdir64_size = sizeof(struct dirent64) + MAXPATHLEN + 1;
# endif /* HAS_READDIR64_R */
# ifdef HAS_SETLOCALE_R
PL_reentrant_buffer->_setlocale_size = REENTRANTSMALLSIZE;
# endif /* HAS_SETLOCALE_R */
# ifdef HAS_STRERROR_R
PL_reentrant_buffer->_strerror_size = 1024;
# endif /* HAS_STRERROR_R */
# ifdef HAS_TTYNAME_R
PL_reentrant_buffer->_ttyname_size = REENTRANTSMALLSIZE;
# endif /* HAS_TTYNAME_R */
#endif /* USE_REENTRANT_API */
}
void
Perl_reentrant_init(pTHX) {
PERL_UNUSED_CONTEXT;
/* Initialize the whole thing */
#ifdef USE_REENTRANT_API
Newx(PL_reentrant_buffer, 1, REENTR);
Perl_reentrant_size(aTHX);
# ifdef HAS_ASCTIME_R
Newx(PL_reentrant_buffer->_asctime_buffer, PL_reentrant_buffer->_asctime_size, char);
# endif /* HAS_ASCTIME_R */
# ifdef HAS_CRYPT_R
# if CRYPT_R_PROTO != REENTRANT_PROTO_B_CCD
PL_reentrant_buffer->_crypt_struct_buffer = 0;
# endif
# endif /* HAS_CRYPT_R */
# ifdef HAS_CTIME_R
Newx(PL_reentrant_buffer->_ctime_buffer, PL_reentrant_buffer->_ctime_size, char);
# endif /* HAS_CTIME_R */
# ifdef HAS_GETGRNAM_R
# ifdef USE_GRENT_FPTR
PL_reentrant_buffer->_grent_fptr = NULL;
# endif
Newx(PL_reentrant_buffer->_grent_buffer, PL_reentrant_buffer->_grent_size, char);
# endif /* HAS_GETGRNAM_R */
# ifdef HAS_GETHOSTBYNAME_R
# if !(GETHOSTBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
Newx(PL_reentrant_buffer->_hostent_buffer, PL_reentrant_buffer->_hostent_size, char);
# endif
# endif /* HAS_GETHOSTBYNAME_R */
# ifdef HAS_GETLOGIN_R
Newx(PL_reentrant_buffer->_getlogin_buffer, PL_reentrant_buffer->_getlogin_size, char);
# endif /* HAS_GETLOGIN_R */
# ifdef HAS_GETNETBYNAME_R
# if !(GETNETBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
Newx(PL_reentrant_buffer->_netent_buffer, PL_reentrant_buffer->_netent_size, char);
# endif
# endif /* HAS_GETNETBYNAME_R */
# ifdef HAS_GETPROTOBYNAME_R
# if !(GETPROTOBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
Newx(PL_reentrant_buffer->_protoent_buffer, PL_reentrant_buffer->_protoent_size, char);
# endif
# endif /* HAS_GETPROTOBYNAME_R */
# ifdef HAS_GETPWNAM_R
# ifdef USE_PWENT_FPTR
PL_reentrant_buffer->_pwent_fptr = NULL;
# endif
Newx(PL_reentrant_buffer->_pwent_buffer, PL_reentrant_buffer->_pwent_size, char);
# endif /* HAS_GETPWNAM_R */
# ifdef HAS_GETSERVBYNAME_R
# if !(GETSERVBYNAME_R_PROTO == REENTRANT_PROTO_I_CCSD)
Newx(PL_reentrant_buffer->_servent_buffer, PL_reentrant_buffer->_servent_size, char);
# endif
# endif /* HAS_GETSERVBYNAME_R */
# ifdef HAS_GETSPNAM_R
# ifdef USE_SPENT_FPTR
PL_reentrant_buffer->_spent_fptr = NULL;
# endif
Newx(PL_reentrant_buffer->_spent_buffer, PL_reentrant_buffer->_spent_size, char);
# endif /* HAS_GETSPNAM_R */
# ifdef HAS_GMTIME_R
# endif /* HAS_GMTIME_R */
# ifdef HAS_LOCALTIME_R
# endif /* HAS_LOCALTIME_R */
# ifdef HAS_READDIR_R
PL_reentrant_buffer->_readdir_struct = (struct dirent*)safemalloc(PL_reentrant_buffer->_readdir_size);
# endif /* HAS_READDIR_R */
# ifdef HAS_READDIR64_R
PL_reentrant_buffer->_readdir64_struct = (struct dirent64*)safemalloc(PL_reentrant_buffer->_readdir64_size);
# endif /* HAS_READDIR64_R */
# ifdef HAS_SETLOCALE_R
Newx(PL_reentrant_buffer->_setlocale_buffer, PL_reentrant_buffer->_setlocale_size, char);
# endif /* HAS_SETLOCALE_R */
# ifdef HAS_STRERROR_R
Newx(PL_reentrant_buffer->_strerror_buffer, PL_reentrant_buffer->_strerror_size, char);
# endif /* HAS_STRERROR_R */
# ifdef HAS_TTYNAME_R
Newx(PL_reentrant_buffer->_ttyname_buffer, PL_reentrant_buffer->_ttyname_size, char);
# endif /* HAS_TTYNAME_R */
#endif /* USE_REENTRANT_API */
}
void
Perl_reentrant_free(pTHX) {
PERL_UNUSED_CONTEXT;
/* Tear down */
#ifdef USE_REENTRANT_API
# ifdef HAS_ASCTIME_R
Safefree(PL_reentrant_buffer->_asctime_buffer);
# endif /* HAS_ASCTIME_R */
# ifdef HAS_CRYPT_R
# if CRYPT_R_PROTO != REENTRANT_PROTO_B_CCD
Safefree(PL_reentrant_buffer->_crypt_struct_buffer);
# endif
# endif /* HAS_CRYPT_R */
# ifdef HAS_CTIME_R
Safefree(PL_reentrant_buffer->_ctime_buffer);
# endif /* HAS_CTIME_R */
# ifdef HAS_GETGRNAM_R
Safefree(PL_reentrant_buffer->_grent_buffer);
# endif /* HAS_GETGRNAM_R */
# ifdef HAS_GETHOSTBYNAME_R
# if !(GETHOSTBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
Safefree(PL_reentrant_buffer->_hostent_buffer);
# endif
# endif /* HAS_GETHOSTBYNAME_R */
# ifdef HAS_GETLOGIN_R
Safefree(PL_reentrant_buffer->_getlogin_buffer);
# endif /* HAS_GETLOGIN_R */
# ifdef HAS_GETNETBYNAME_R
# if !(GETNETBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
Safefree(PL_reentrant_buffer->_netent_buffer);
# endif
# endif /* HAS_GETNETBYNAME_R */
# ifdef HAS_GETPROTOBYNAME_R
# if !(GETPROTOBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
Safefree(PL_reentrant_buffer->_protoent_buffer);
# endif
# endif /* HAS_GETPROTOBYNAME_R */
# ifdef HAS_GETPWNAM_R
Safefree(PL_reentrant_buffer->_pwent_buffer);
# endif /* HAS_GETPWNAM_R */
# ifdef HAS_GETSERVBYNAME_R
# if !(GETSERVBYNAME_R_PROTO == REENTRANT_PROTO_I_CCSD)
Safefree(PL_reentrant_buffer->_servent_buffer);
# endif
# endif /* HAS_GETSERVBYNAME_R */
# ifdef HAS_GETSPNAM_R
Safefree(PL_reentrant_buffer->_spent_buffer);
# endif /* HAS_GETSPNAM_R */
# ifdef HAS_GMTIME_R
# endif /* HAS_GMTIME_R */
# ifdef HAS_LOCALTIME_R
# endif /* HAS_LOCALTIME_R */
# ifdef HAS_READDIR_R
Safefree(PL_reentrant_buffer->_readdir_struct);
# endif /* HAS_READDIR_R */
# ifdef HAS_READDIR64_R
Safefree(PL_reentrant_buffer->_readdir64_struct);
# endif /* HAS_READDIR64_R */
# ifdef HAS_SETLOCALE_R
Safefree(PL_reentrant_buffer->_setlocale_buffer);
# endif /* HAS_SETLOCALE_R */
# ifdef HAS_STRERROR_R
Safefree(PL_reentrant_buffer->_strerror_buffer);
# endif /* HAS_STRERROR_R */
# ifdef HAS_TTYNAME_R
Safefree(PL_reentrant_buffer->_ttyname_buffer);
# endif /* HAS_TTYNAME_R */
Safefree(PL_reentrant_buffer);
#endif /* USE_REENTRANT_API */
}
void*
Perl_reentrant_retry(const char *f, ...)
{
/* This function is set up to be called if the normal function returns
* failure with errno ERANGE, which indicates the buffer is too small.
* This function calls the failing one again with a larger buffer.
*
* What has happened is that, due to the magic of C preprocessor macro
* expansion, when the original code called function 'foo(args)', it was
* instead compiled into something like a call of 'foo_r(args, buffer)'
* Below we retry with 'foo', but the preprocessor has changed that into
* 'foo_r', so this function will end up calling itself recursively, each
* time with a larger buffer. If PERL_REENTRANT_MAXSIZE is defined, it
* won't increase beyond that, instead failing. */
void *retptr = NULL;
va_list ap;
I32 key = 0;
#ifdef USE_REENTRANT_API
dTHX;
key = Perl_keyword (aTHX_ f, strlen(f), FALSE /* not feature enabled */);
/* Easier to special case this here than in embed.pl. (Look at what it
generates for proto.h) */
PERL_ARGS_ASSERT_REENTRANT_RETRY;
#endif
if (key == 0) {
#ifdef HAS_GETSPNAM_R
/* This is a #define as has no corresponding keyword */
if (strEQ(f, "getspnam")) {
key = KEY_getspnam;
}
#endif
}
else if (key < 0) {
key = -key;
}
va_start(ap, f);
#ifdef USE_REENTRANT_API
switch (key) {
# ifdef USE_HOSTENT_BUFFER
case KEY_gethostbyaddr:
case KEY_gethostbyname:
case KEY_endhostent:
{
char * host_addr;
Size_t asize;
char * host_name;
int anint;
# ifdef PERL_REENTRANT_MAXSIZE
if (PL_reentrant_buffer->_hostent_size <=
PERL_REENTRANT_MAXSIZE / 2)
# endif
RenewDouble(PL_reentrant_buffer->_hostent_buffer,
&PL_reentrant_buffer->_hostent_size, char);
switch (key) {
case KEY_gethostbyaddr:
host_addr = va_arg(ap, char *);
asize = va_arg(ap, Size_t);
anint = va_arg(ap, int);
/* socklen_t is what Posix 2001 says this should be */
retptr = gethostbyaddr(host_addr, (socklen_t) asize, anint); break;
case KEY_gethostbyname:
host_name = va_arg(ap, char *);
retptr = gethostbyname(host_name); break;
case KEY_endhostent:
retptr = gethostent(); break;
default:
SETERRNO(ERANGE, LIB_INVARG);
break;
}
}
break;
# endif
# ifdef USE_GRENT_BUFFER
case KEY_getgrent:
case KEY_getgrgid:
case KEY_getgrnam:
{
char * name;
Gid_t gid;
# ifdef PERL_REENTRANT_MAXSIZE
if (PL_reentrant_buffer->_grent_size <=
PERL_REENTRANT_MAXSIZE / 2)
# endif
RenewDouble(PL_reentrant_buffer->_grent_buffer,
&PL_reentrant_buffer->_grent_size, char);
switch (key) {
case KEY_getgrnam:
name = va_arg(ap, char *);
retptr = getgrnam(name); break;
case KEY_getgrgid:
# if Gid_t_size < INTSIZE
gid = (Gid_t)va_arg(ap, int);
# else
gid = va_arg(ap, Gid_t);
# endif
retptr = getgrgid(gid); break;
case KEY_getgrent:
retptr = getgrent(); break;
default:
SETERRNO(ERANGE, LIB_INVARG);
break;
}
}
break;
# endif
# ifdef USE_NETENT_BUFFER
case KEY_getnetbyaddr:
case KEY_getnetbyname:
case KEY_getnetent:
{
char * name;
Netdb_net_t net;
int anint;
# ifdef PERL_REENTRANT_MAXSIZE
if (PL_reentrant_buffer->_netent_size <=
PERL_REENTRANT_MAXSIZE / 2)
# endif
RenewDouble(PL_reentrant_buffer->_netent_buffer,
&PL_reentrant_buffer->_netent_size, char);
switch (key) {
case KEY_getnetbyaddr:
net = va_arg(ap, Netdb_net_t);
anint = va_arg(ap, int);
retptr = getnetbyaddr(net, anint); break;
case KEY_getnetbyname:
name = va_arg(ap, char *);
retptr = getnetbyname(name); break;
case KEY_getnetent:
retptr = getnetent(); break;
default:
SETERRNO(ERANGE, LIB_INVARG);
break;
}
}
break;
# endif
# ifdef USE_PWENT_BUFFER
case KEY_getpwnam:
case KEY_getpwuid:
case KEY_getpwent:
{
Uid_t uid;
char * name;
# ifdef PERL_REENTRANT_MAXSIZE
if (PL_reentrant_buffer->_pwent_size <=
PERL_REENTRANT_MAXSIZE / 2)
# endif
RenewDouble(PL_reentrant_buffer->_pwent_buffer,
&PL_reentrant_buffer->_pwent_size, char);
switch (key) {
case KEY_getpwnam:
name = va_arg(ap, char *);
retptr = getpwnam(name); break;
case KEY_getpwuid:
# if Uid_t_size < INTSIZE
uid = (Uid_t)va_arg(ap, int);
# else
uid = va_arg(ap, Uid_t);
# endif
retptr = getpwuid(uid); break;
# if defined(HAS_GETPWENT) || defined(HAS_GETPWENT_R)
case KEY_getpwent:
retptr = getpwent(); break;
# endif
default:
SETERRNO(ERANGE, LIB_INVARG);
break;
}
}
break;
# endif
# ifdef USE_SPENT_BUFFER
case KEY_getspnam:
{
char * name;
# ifdef PERL_REENTRANT_MAXSIZE
if (PL_reentrant_buffer->_spent_size <=
PERL_REENTRANT_MAXSIZE / 2)
# endif
RenewDouble(PL_reentrant_buffer->_spent_buffer,
&PL_reentrant_buffer->_spent_size, char);
switch (key) {
case KEY_getspnam:
name = va_arg(ap, char *);
retptr = getspnam(name); break;
default:
SETERRNO(ERANGE, LIB_INVARG);
break;
}
}
break;
# endif
# ifdef USE_PROTOENT_BUFFER
case KEY_getprotobyname:
case KEY_getprotobynumber:
case KEY_getprotoent:
{
char * name;
int anint;
# ifdef PERL_REENTRANT_MAXSIZE
if (PL_reentrant_buffer->_protoent_size <=
PERL_REENTRANT_MAXSIZE / 2)
# endif
RenewDouble(PL_reentrant_buffer->_protoent_buffer,
&PL_reentrant_buffer->_protoent_size, char);
switch (key) {
case KEY_getprotobyname:
name = va_arg(ap, char *);
retptr = getprotobyname(name); break;
case KEY_getprotobynumber:
anint = va_arg(ap, int);
retptr = getprotobynumber(anint); break;
case KEY_getprotoent:
retptr = getprotoent(); break;
default:
SETERRNO(ERANGE, LIB_INVARG);
break;
}
}
break;
# endif
# ifdef USE_SERVENT_BUFFER
case KEY_getservbyname:
case KEY_getservbyport:
case KEY_getservent:
{
char * name;
char * proto;
int anint;
# ifdef PERL_REENTRANT_MAXSIZE
if (PL_reentrant_buffer->_servent_size <=
PERL_REENTRANT_MAXSIZE / 2)
# endif
RenewDouble(PL_reentrant_buffer->_servent_buffer,
&PL_reentrant_buffer->_servent_size, char);
switch (key) {
case KEY_getservbyname:
name = va_arg(ap, char *);
proto = va_arg(ap, char *);
retptr = getservbyname(name, proto); break;
case KEY_getservbyport:
anint = va_arg(ap, int);
name = va_arg(ap, char *);
retptr = getservbyport(anint, name); break;
case KEY_getservent:
retptr = getservent(); break;
default:
SETERRNO(ERANGE, LIB_INVARG);
break;
}
}
break;
# endif
default:
/* Not known how to retry, so just fail. */
break;
}
#else
PERL_UNUSED_ARG(f);
#endif
va_end(ap);
return retptr;
}
/* ex: set ro ft=c: */
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