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Unblock signal-mask on error for unsafe signals
[perl5.git] / perlio.h
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1/* perlio.h
2 *
4bb101f2 3 * Copyright (C) 1996, 1997, 1999, 2000, 2001, 2002, 2003,
663f364b 4 * 2004, 2005, 2006, 2007, by Larry Wall and others
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5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
9 */
10
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11#ifndef _PERLIO_H
12#define _PERLIO_H
13/*
14 Interface for perl to IO functions.
3d036c2b 15 There is a hierarchy of Configure determined #define controls:
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16 USE_STDIO - forces PerlIO_xxx() to be #define-d onto stdio functions.
17 This is used for x2p subdirectory and for conservative
18 builds - "just like perl5.00X used to be".
19 This dominates over the others.
20
21 USE_PERLIO - The primary Configure variable that enables PerlIO.
22 If USE_PERLIO is _NOT_ set
23 then USE_STDIO above will be set to be conservative.
24 If USE_PERLIO is set
25 then there are two modes determined by USE_SFIO:
26
27 USE_SFIO - If set causes PerlIO_xxx() to be #define-d onto sfio functions.
486ec47a 28 A backward compatibility mode for some specialist applications.
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29
30 If USE_SFIO is not set then PerlIO_xxx() are real functions
31 defined in perlio.c which implement extra functionality
32 required for utf8 support.
33
34 One further note - the table-of-functions scheme controlled
35 by PERL_IMPLICIT_SYS turns on USE_PERLIO so that iperlsys.h can
36 #define PerlIO_xxx() to go via the function table, without having
37 to #undef them from (say) stdio forms.
38
39*/
40
41#if defined(PERL_IMPLICIT_SYS)
42#ifndef USE_PERLIO
2986a63f 43#ifndef NETWARE
2cbbe5a1 44/* # define USE_PERLIO */
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45#endif
46#endif
2986a63f 47#endif
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48
49#ifndef USE_PERLIO
50# define USE_STDIO
51#endif
52
53#ifdef USE_STDIO
54# ifndef PERLIO_IS_STDIO
55# define PERLIO_IS_STDIO
56# endif
57#endif
58
59/* -------------------- End of Configure controls ---------------------------- */
60
61/*
62 * Although we may not want stdio to be used including <stdio.h> here
63 * avoids issues where stdio.h has strange side effects
64 */
65#include <stdio.h>
66
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67#ifdef __BEOS__
68int fseeko(FILE *stream, off_t offset, int whence);
69off_t ftello(FILE *stream);
70#endif
71
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72#if defined(USE_64_BIT_STDIO) && defined(HAS_FTELLO) && !defined(USE_FTELL64)
73#define ftell ftello
74#endif
75
76#if defined(USE_64_BIT_STDIO) && defined(HAS_FSEEKO) && !defined(USE_FSEEK64)
77#define fseek fseeko
78#endif
79
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80/* BS2000 includes are sometimes a bit non standard :-( */
81#if defined(POSIX_BC) && defined(O_BINARY) && !defined(O_TEXT)
82#undef O_BINARY
83#endif
84
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85#ifdef PERLIO_IS_STDIO
86/* #define PerlIO_xxxx() as equivalent stdio function */
87#include "perlsdio.h"
14a5cf38 88#else /* PERLIO_IS_STDIO */
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89#ifdef USE_SFIO
90/* #define PerlIO_xxxx() as equivalent sfio function */
91#include "perlsfio.h"
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92#endif /* USE_SFIO */
93#endif /* PERLIO_IS_STDIO */
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94
95#ifndef PerlIO
96/* ----------- PerlIO implementation ---------- */
97/* PerlIO not #define-d to something else - define the implementation */
98
99typedef struct _PerlIO PerlIOl;
100typedef struct _PerlIO_funcs PerlIO_funcs;
101typedef PerlIOl *PerlIO;
102#define PerlIO PerlIO
a1d180c4 103#define PERLIO_LAYERS 1
76ced9ad 104
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105/* Making the big PerlIO_funcs vtables const is good (enables placing
106 * them in the const section which is good for speed, security, and
107 * embeddability) but this cannot be done by default because of
108 * backward compatibility. */
109#ifdef PERLIO_FUNCS_CONST
110#define PERLIO_FUNCS_DECL(funcs) const PerlIO_funcs funcs
111#define PERLIO_FUNCS_CAST(funcs) (PerlIO_funcs*)(funcs)
112#else
113#define PERLIO_FUNCS_DECL(funcs) PerlIO_funcs funcs
114#define PERLIO_FUNCS_CAST(funcs) (funcs)
115#endif
116
117PERL_EXPORT_C void PerlIO_define_layer(pTHX_ PerlIO_funcs *tab);
118PERL_EXPORT_C PerlIO_funcs *PerlIO_find_layer(pTHX_ const char *name,
119 STRLEN len,
120 int load);
121PERL_EXPORT_C PerlIO *PerlIO_push(pTHX_ PerlIO *f, PERLIO_FUNCS_DECL(*tab),
122 const char *mode, SV *arg);
123PERL_EXPORT_C void PerlIO_pop(pTHX_ PerlIO *f);
124PERL_EXPORT_C AV* PerlIO_get_layers(pTHX_ PerlIO *f);
125PERL_EXPORT_C void PerlIO_clone(pTHX_ PerlInterpreter *proto,
126 CLONE_PARAMS *param);
76ced9ad 127
14a5cf38 128#endif /* PerlIO */
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129
130/* ----------- End of implementation choices ---------- */
131
132#ifndef PERLIO_IS_STDIO
133/* Not using stdio _directly_ as PerlIO */
134
135/* We now need to determine what happens if source trys to use stdio.
136 * There are three cases based on PERLIO_NOT_STDIO which XS code
137 * can set how it wants.
138 */
139
140#ifdef PERL_CORE
141/* Make a choice for perl core code
142 - currently this is set to try and catch lingering raw stdio calls.
143 This is a known issue with some non UNIX ports which still use
144 "native" stdio features.
145*/
146#ifndef PERLIO_NOT_STDIO
147#define PERLIO_NOT_STDIO 1
148#endif
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149#else
150#ifndef PERLIO_NOT_STDIO
151#define PERLIO_NOT_STDIO 0
152#endif
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153#endif
154
155#ifdef PERLIO_NOT_STDIO
156#if PERLIO_NOT_STDIO
157/*
158 * PERLIO_NOT_STDIO #define'd as 1
159 * Case 1: Strong denial of stdio - make all stdio calls (we can think of) errors
160 */
161#include "nostdio.h"
14a5cf38 162#else /* if PERLIO_NOT_STDIO */
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163/*
164 * PERLIO_NOT_STDIO #define'd as 0
165 * Case 2: Declares that both PerlIO and stdio can be used
166 */
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167#endif /* if PERLIO_NOT_STDIO */
168#else /* ifdef PERLIO_NOT_STDIO */
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169/*
170 * PERLIO_NOT_STDIO not defined
171 * Case 3: Try and fake stdio calls as PerlIO calls
172 */
173#include "fakesdio.h"
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174#endif /* ifndef PERLIO_NOT_STDIO */
175#endif /* PERLIO_IS_STDIO */
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176
177/* ----------- fill in things that have not got #define'd ---------- */
178
179#ifndef Fpos_t
180#define Fpos_t Off_t
181#endif
182
183#ifndef EOF
184#define EOF (-1)
185#endif
186
187/* This is to catch case with no stdio */
188#ifndef BUFSIZ
189#define BUFSIZ 1024
190#endif
191
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192/* The default buffer size for the perlio buffering layer */
193#ifndef PERLIOBUF_DEFAULT_BUFSIZ
194#define PERLIOBUF_DEFAULT_BUFSIZ 4096
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195#endif
196
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197#ifndef SEEK_SET
198#define SEEK_SET 0
199#endif
200
201#ifndef SEEK_CUR
202#define SEEK_CUR 1
203#endif
204
205#ifndef SEEK_END
206#define SEEK_END 2
207#endif
208
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209#define PERLIO_DUP_CLONE 1
210#define PERLIO_DUP_FD 2
211
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212/* --------------------- Now prototypes for functions --------------- */
213
adb71456 214START_EXTERN_C
2c2e4525 215#ifndef __attribute__format__
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216# ifdef HASATTRIBUTE_FORMAT
217# define __attribute__format__(x,y,z) __attribute__((format(x,y,z)))
218# else
219# define __attribute__format__(x,y,z)
220# endif
76ced9ad 221#endif
76ced9ad 222#ifndef PerlIO_init
27da23d5 223PERL_EXPORT_C void PerlIO_init(pTHX);
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224#endif
225#ifndef PerlIO_stdoutf
27da23d5 226PERL_EXPORT_C int PerlIO_stdoutf(const char *, ...)
287c8091 227 __attribute__format__(__printf__, 1, 2);
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228#endif
229#ifndef PerlIO_puts
27da23d5 230PERL_EXPORT_C int PerlIO_puts(PerlIO *, const char *);
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231#endif
232#ifndef PerlIO_open
27da23d5 233PERL_EXPORT_C PerlIO *PerlIO_open(const char *, const char *);
76ced9ad 234#endif
6e60e805 235#ifndef PerlIO_openn
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236PERL_EXPORT_C PerlIO *PerlIO_openn(pTHX_ const char *layers, const char *mode,
237 int fd, int imode, int perm, PerlIO *old,
238 int narg, SV **arg);
ee518936 239#endif
76ced9ad 240#ifndef PerlIO_eof
27da23d5 241PERL_EXPORT_C int PerlIO_eof(PerlIO *);
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242#endif
243#ifndef PerlIO_error
27da23d5 244PERL_EXPORT_C int PerlIO_error(PerlIO *);
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245#endif
246#ifndef PerlIO_clearerr
27da23d5 247PERL_EXPORT_C void PerlIO_clearerr(PerlIO *);
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248#endif
249#ifndef PerlIO_getc
27da23d5 250PERL_EXPORT_C int PerlIO_getc(PerlIO *);
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251#endif
252#ifndef PerlIO_putc
27da23d5 253PERL_EXPORT_C int PerlIO_putc(PerlIO *, int);
76ced9ad 254#endif
76ced9ad 255#ifndef PerlIO_ungetc
27da23d5 256PERL_EXPORT_C int PerlIO_ungetc(PerlIO *, int);
76ced9ad 257#endif
76ced9ad 258#ifndef PerlIO_fdopen
27da23d5 259PERL_EXPORT_C PerlIO *PerlIO_fdopen(int, const char *);
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260#endif
261#ifndef PerlIO_importFILE
27da23d5 262PERL_EXPORT_C PerlIO *PerlIO_importFILE(FILE *, const char *);
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263#endif
264#ifndef PerlIO_exportFILE
27da23d5 265PERL_EXPORT_C FILE *PerlIO_exportFILE(PerlIO *, const char *);
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266#endif
267#ifndef PerlIO_findFILE
27da23d5 268PERL_EXPORT_C FILE *PerlIO_findFILE(PerlIO *);
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269#endif
270#ifndef PerlIO_releaseFILE
27da23d5 271PERL_EXPORT_C void PerlIO_releaseFILE(PerlIO *, FILE *);
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272#endif
273#ifndef PerlIO_read
27da23d5 274PERL_EXPORT_C SSize_t PerlIO_read(PerlIO *, void *, Size_t);
76ced9ad 275#endif
a15cef0c 276#ifndef PerlIO_unread
27da23d5 277PERL_EXPORT_C SSize_t PerlIO_unread(PerlIO *, const void *, Size_t);
a15cef0c 278#endif
76ced9ad 279#ifndef PerlIO_write
27da23d5 280PERL_EXPORT_C SSize_t PerlIO_write(PerlIO *, const void *, Size_t);
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281#endif
282#ifndef PerlIO_setlinebuf
27da23d5 283PERL_EXPORT_C void PerlIO_setlinebuf(PerlIO *);
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284#endif
285#ifndef PerlIO_printf
27da23d5 286PERL_EXPORT_C int PerlIO_printf(PerlIO *, const char *, ...)
287c8091 287 __attribute__format__(__printf__, 2, 3);
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288#endif
289#ifndef PerlIO_sprintf
27da23d5 290PERL_EXPORT_C int PerlIO_sprintf(char *, int, const char *, ...)
287c8091 291 __attribute__format__(__printf__, 3, 4);
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292#endif
293#ifndef PerlIO_vprintf
27da23d5 294PERL_EXPORT_C int PerlIO_vprintf(PerlIO *, const char *, va_list);
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295#endif
296#ifndef PerlIO_tell
27da23d5 297PERL_EXPORT_C Off_t PerlIO_tell(PerlIO *);
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298#endif
299#ifndef PerlIO_seek
27da23d5 300PERL_EXPORT_C int PerlIO_seek(PerlIO *, Off_t, int);
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301#endif
302#ifndef PerlIO_rewind
27da23d5 303PERL_EXPORT_C void PerlIO_rewind(PerlIO *);
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304#endif
305#ifndef PerlIO_has_base
27da23d5 306PERL_EXPORT_C int PerlIO_has_base(PerlIO *);
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307#endif
308#ifndef PerlIO_has_cntptr
27da23d5 309PERL_EXPORT_C int PerlIO_has_cntptr(PerlIO *);
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310#endif
311#ifndef PerlIO_fast_gets
27da23d5 312PERL_EXPORT_C int PerlIO_fast_gets(PerlIO *);
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313#endif
314#ifndef PerlIO_canset_cnt
27da23d5 315PERL_EXPORT_C int PerlIO_canset_cnt(PerlIO *);
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316#endif
317#ifndef PerlIO_get_ptr
27da23d5 318PERL_EXPORT_C STDCHAR *PerlIO_get_ptr(PerlIO *);
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319#endif
320#ifndef PerlIO_get_cnt
27da23d5 321PERL_EXPORT_C int PerlIO_get_cnt(PerlIO *);
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322#endif
323#ifndef PerlIO_set_cnt
27da23d5 324PERL_EXPORT_C void PerlIO_set_cnt(PerlIO *, int);
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325#endif
326#ifndef PerlIO_set_ptrcnt
27da23d5 327PERL_EXPORT_C void PerlIO_set_ptrcnt(PerlIO *, STDCHAR *, int);
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328#endif
329#ifndef PerlIO_get_base
27da23d5 330PERL_EXPORT_C STDCHAR *PerlIO_get_base(PerlIO *);
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331#endif
332#ifndef PerlIO_get_bufsiz
27da23d5 333PERL_EXPORT_C int PerlIO_get_bufsiz(PerlIO *);
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334#endif
335#ifndef PerlIO_tmpfile
27da23d5 336PERL_EXPORT_C PerlIO *PerlIO_tmpfile(void);
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337#endif
338#ifndef PerlIO_stdin
27da23d5 339PERL_EXPORT_C PerlIO *PerlIO_stdin(void);
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340#endif
341#ifndef PerlIO_stdout
27da23d5 342PERL_EXPORT_C PerlIO *PerlIO_stdout(void);
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343#endif
344#ifndef PerlIO_stderr
27da23d5 345PERL_EXPORT_C PerlIO *PerlIO_stderr(void);
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346#endif
347#ifndef PerlIO_getpos
27da23d5 348PERL_EXPORT_C int PerlIO_getpos(PerlIO *, SV *);
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349#endif
350#ifndef PerlIO_setpos
27da23d5 351PERL_EXPORT_C int PerlIO_setpos(PerlIO *, SV *);
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352#endif
353#ifndef PerlIO_fdupopen
27da23d5 354PERL_EXPORT_C PerlIO *PerlIO_fdupopen(pTHX_ PerlIO *, CLONE_PARAMS *, int);
5f1a76d0 355#endif
11ae941d 356#if !defined(PerlIO_modestr) && !defined(PERLIO_IS_STDIO)
27da23d5 357PERL_EXPORT_C char *PerlIO_modestr(PerlIO *, char *buf);
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358#endif
359#ifndef PerlIO_isutf8
27da23d5 360PERL_EXPORT_C int PerlIO_isutf8(PerlIO *);
76ced9ad 361#endif
156e9b51 362#ifndef PerlIO_apply_layers
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363PERL_EXPORT_C int PerlIO_apply_layers(pTHX_ PerlIO *f, const char *mode,
364 const char *names);
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365#endif
366#ifndef PerlIO_binmode
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367PERL_EXPORT_C int PerlIO_binmode(pTHX_ PerlIO *f, int iotype, int omode,
368 const char *names);
ac27b0f5 369#endif
a15cef0c 370#ifndef PerlIO_getname
27da23d5 371PERL_EXPORT_C char *PerlIO_getname(PerlIO *, char *);
a15cef0c 372#endif
76ced9ad 373
27da23d5 374PERL_EXPORT_C void PerlIO_destruct(pTHX);
13621cfb 375
27da23d5 376PERL_EXPORT_C int PerlIO_intmode2str(int rawmode, char *mode, int *writing);
06c7082d 377
3a1ee7e8 378#ifdef PERLIO_LAYERS
27da23d5 379PERL_EXPORT_C void PerlIO_cleanup(pTHX);
adb71456 380
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381PERL_EXPORT_C void PerlIO_debug(const char *fmt, ...)
382 __attribute__format__(__printf__, 1, 2);
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383typedef struct PerlIO_list_s PerlIO_list_t;
384
88b61e10 385
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386#endif
387
adb71456 388END_EXTERN_C
14a5cf38 389#endif /* _PERLIO_H */
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390
391/*
392 * Local variables:
393 * c-indentation-style: bsd
394 * c-basic-offset: 4
395 * indent-tabs-mode: t
396 * End:
397 *
398 * ex: set ts=8 sts=4 sw=4 noet:
399 */