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1 | /* |
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2 | * fcgiapp.h -- |
3 | * |
4 | * Definitions for FastCGI application server programs |
5 | * |
6 | * |
7 | * Copyright (c) 1996 Open Market, Inc. |
8 | * |
9 | * See the file "LICENSE.TERMS" for information on usage and redistribution |
10 | * of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
11 | * |
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12 | * $Id: fcgiapp.h,v 1.5 2000/11/05 17:09:36 robs Exp $ |
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13 | */ |
14 | |
15 | #ifndef _FCGIAPP_H |
16 | #define _FCGIAPP_H |
17 | |
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18 | /* Hack to see if we are building TCL - TCL needs varargs not stdarg */ |
19 | #ifndef TCL_LIBRARY |
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20 | #include <stdarg.h> |
21 | #else |
22 | #include <varargs.h> |
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23 | #endif |
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24 | |
25 | #if defined (c_plusplus) || defined (__cplusplus) |
26 | extern "C" { |
27 | #endif |
28 | |
344bf056 |
29 | #ifdef _WIN32 |
30 | |
31 | #ifndef DLLAPI |
32 | #define DLLAPI __declspec(dllimport) |
33 | #endif |
34 | |
35 | #else /* !_WIN32 */ |
36 | |
37 | #define DLLAPI |
38 | |
39 | #endif /* !_WIN32 */ |
40 | |
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41 | /* |
42 | * Error codes. Assigned to avoid conflict with EOF and errno(2). |
43 | */ |
44 | #define FCGX_UNSUPPORTED_VERSION -2 |
45 | #define FCGX_PROTOCOL_ERROR -3 |
46 | #define FCGX_PARAMS_ERROR -4 |
47 | #define FCGX_CALL_SEQ_ERROR -5 |
48 | |
49 | /* |
50 | * This structure defines the state of a FastCGI stream. |
51 | * Streams are modeled after the FILE type defined in stdio.h. |
52 | * (We wouldn't need our own if platform vendors provided a |
53 | * standard way to subclass theirs.) |
54 | * The state of a stream is private and should only be accessed |
55 | * by the procedures defined below. |
56 | */ |
57 | typedef struct FCGX_Stream { |
58 | unsigned char *rdNext; /* reader: first valid byte |
59 | * writer: equals stop */ |
60 | unsigned char *wrNext; /* writer: first free byte |
61 | * reader: equals stop */ |
62 | unsigned char *stop; /* reader: last valid byte + 1 |
63 | * writer: last free byte + 1 */ |
64 | unsigned char *stopUnget; /* reader: first byte of current buffer |
65 | * fragment, for ungetc |
66 | * writer: undefined */ |
67 | int isReader; |
68 | int isClosed; |
69 | int wasFCloseCalled; |
70 | int FCGI_errno; /* error status */ |
71 | void (*fillBuffProc) (struct FCGX_Stream *stream); |
72 | void (*emptyBuffProc) (struct FCGX_Stream *stream, int doClose); |
73 | void *data; |
74 | } FCGX_Stream; |
75 | |
76 | /* |
77 | * An environment (as defined by environ(7)): A NULL-terminated array |
78 | * of strings, each string having the form name=value. |
79 | */ |
80 | typedef char **FCGX_ParamArray; |
81 | |
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82 | /* |
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83 | * FCGX_Request Flags |
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84 | * |
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85 | * Setting FCGI_FAIL_ACCEPT_ON_INTR prevents FCGX_Accept() from |
86 | * restarting upon being interrupted. |
87 | */ |
88 | #define FCGI_FAIL_ACCEPT_ON_INTR 1 |
89 | |
90 | /* |
91 | * FCGX_Request -- State associated with a request. |
92 | * |
93 | * Its exposed for API simplicity, I expect parts of it to change! |
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94 | */ |
95 | typedef struct FCGX_Request { |
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96 | int requestId; /* valid if isBeginProcessed */ |
97 | int role; |
98 | FCGX_Stream *in; |
99 | FCGX_Stream *out; |
100 | FCGX_Stream *err; |
101 | char **envp; |
102 | |
103 | /* Don't use anything below here */ |
104 | |
105 | struct Params *paramsPtr; |
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106 | int ipcFd; /* < 0 means no connection */ |
107 | int isBeginProcessed; /* FCGI_BEGIN_REQUEST seen */ |
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108 | int keepConnection; /* don't close ipcFd at end of request */ |
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109 | int appStatus; |
110 | int nWriters; /* number of open writers (0..2) */ |
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111 | int flags; |
112 | int listen_sock; |
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113 | } FCGX_Request; |
114 | |
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115 | \f |
116 | /* |
117 | *====================================================================== |
118 | * Control |
119 | *====================================================================== |
120 | */ |
121 | |
122 | /* |
123 | *---------------------------------------------------------------------- |
124 | * |
125 | * FCGX_IsCGI -- |
126 | * |
127 | * Returns TRUE iff this process appears to be a CGI process |
128 | * rather than a FastCGI process. |
129 | * |
130 | *---------------------------------------------------------------------- |
131 | */ |
132 | DLLAPI int FCGX_IsCGI(void); |
133 | |
134 | /* |
135 | *---------------------------------------------------------------------- |
136 | * |
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137 | * FCGX_Init -- |
138 | * |
139 | * Initialize the FCGX library. Call in multi-threaded apps |
140 | * before calling FCGX_Accept_r(). |
141 | * |
142 | * Returns 0 upon success. |
143 | * |
144 | *---------------------------------------------------------------------- |
145 | */ |
146 | DLLAPI int FCGX_Init(void); |
147 | |
148 | /* |
149 | *---------------------------------------------------------------------- |
150 | * |
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151 | * FCGX_OpenSocket -- |
152 | * |
153 | * Create a FastCGI listen socket. |
154 | * |
155 | * path is the Unix domain socket (named pipe for WinNT), or a colon |
156 | * followed by a port number. e.g. "/tmp/fastcgi/mysocket", ":5000" |
157 | * |
158 | * backlog is the listen queue depth used in the listen() call. |
159 | * |
160 | * Returns the socket's file descriptor or -1 on error. |
161 | * |
162 | *---------------------------------------------------------------------- |
163 | */ |
164 | DLLAPI int FCGX_OpenSocket(const char *path, int backlog); |
165 | |
166 | /* |
167 | *---------------------------------------------------------------------- |
168 | * |
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169 | * FCGX_InitRequest -- |
170 | * |
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171 | * Initialize a FCGX_Request for use with FCGX_Accept_r(). |
172 | * |
173 | * sock is a file descriptor returned by FCGX_OpenSocket() or 0 (default). |
174 | * The only supported flag at this time is FCGI_FAIL_ON_INTR. |
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175 | * |
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176 | * Returns 0 upon success. |
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177 | *---------------------------------------------------------------------- |
178 | */ |
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179 | DLLAPI int FCGX_InitRequest(FCGX_Request *request, int sock, int flags); |
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180 | |
181 | /* |
182 | *---------------------------------------------------------------------- |
183 | * |
184 | * FCGX_Accept_r -- |
185 | * |
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186 | * Accept a new request (multi-thread safe). Be sure to call |
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187 | * FCGX_Init() first. |
188 | * |
189 | * Results: |
190 | * 0 for successful call, -1 for error. |
191 | * |
192 | * Side effects: |
193 | * |
194 | * Finishes the request accepted by (and frees any |
195 | * storage allocated by) the previous call to FCGX_Accept. |
196 | * Creates input, output, and error streams and |
197 | * assigns them to *in, *out, and *err respectively. |
198 | * Creates a parameters data structure to be accessed |
199 | * via getenv(3) (if assigned to environ) or by FCGX_GetParam |
200 | * and assigns it to *envp. |
201 | * |
202 | * DO NOT retain pointers to the envp array or any strings |
203 | * contained in it (e.g. to the result of calling FCGX_GetParam), |
204 | * since these will be freed by the next call to FCGX_Finish |
205 | * or FCGX_Accept. |
206 | * |
207 | * DON'T use the FCGX_Request, its structure WILL change. |
208 | * |
209 | *---------------------------------------------------------------------- |
210 | */ |
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211 | DLLAPI int FCGX_Accept_r(FCGX_Request *request); |
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212 | |
213 | /* |
214 | *---------------------------------------------------------------------- |
215 | * |
216 | * FCGX_Finish_r -- |
217 | * |
218 | * Finish the request (multi-thread safe). |
219 | * |
220 | * Side effects: |
221 | * |
222 | * Finishes the request accepted by (and frees any |
223 | * storage allocated by) the previous call to FCGX_Accept. |
224 | * |
225 | * DO NOT retain pointers to the envp array or any strings |
226 | * contained in it (e.g. to the result of calling FCGX_GetParam), |
227 | * since these will be freed by the next call to FCGX_Finish |
228 | * or FCGX_Accept. |
229 | * |
230 | *---------------------------------------------------------------------- |
231 | */ |
232 | DLLAPI void FCGX_Finish_r(FCGX_Request *request); |
233 | |
234 | /* |
235 | *---------------------------------------------------------------------- |
236 | * |
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237 | * FCGX_Free -- |
238 | * |
239 | * Free the memory and IPC FD associated with the request (multi-thread safe). |
240 | * |
241 | *---------------------------------------------------------------------- |
242 | */ |
243 | DLLAPI void FCGX_Free(FCGX_Request * request); |
244 | |
245 | /* |
246 | *---------------------------------------------------------------------- |
247 | * |
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248 | * FCGX_Accept -- |
249 | * |
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250 | * Accept a new request (NOT multi-thread safe). |
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251 | * |
252 | * Results: |
253 | * 0 for successful call, -1 for error. |
254 | * |
255 | * Side effects: |
256 | * |
257 | * Finishes the request accepted by (and frees any |
258 | * storage allocated by) the previous call to FCGX_Accept. |
259 | * Creates input, output, and error streams and |
260 | * assigns them to *in, *out, and *err respectively. |
261 | * Creates a parameters data structure to be accessed |
262 | * via getenv(3) (if assigned to environ) or by FCGX_GetParam |
263 | * and assigns it to *envp. |
264 | * |
265 | * DO NOT retain pointers to the envp array or any strings |
266 | * contained in it (e.g. to the result of calling FCGX_GetParam), |
267 | * since these will be freed by the next call to FCGX_Finish |
268 | * or FCGX_Accept. |
269 | * |
270 | *---------------------------------------------------------------------- |
271 | */ |
272 | DLLAPI int FCGX_Accept( |
273 | FCGX_Stream **in, |
274 | FCGX_Stream **out, |
275 | FCGX_Stream **err, |
276 | FCGX_ParamArray *envp); |
277 | |
278 | /* |
279 | *---------------------------------------------------------------------- |
280 | * |
281 | * FCGX_Finish -- |
282 | * |
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283 | * Finish the current request (NOT multi-thread safe). |
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284 | * |
285 | * Side effects: |
286 | * |
287 | * Finishes the request accepted by (and frees any |
288 | * storage allocated by) the previous call to FCGX_Accept. |
289 | * |
290 | * DO NOT retain pointers to the envp array or any strings |
291 | * contained in it (e.g. to the result of calling FCGX_GetParam), |
292 | * since these will be freed by the next call to FCGX_Finish |
293 | * or FCGX_Accept. |
294 | * |
295 | *---------------------------------------------------------------------- |
296 | */ |
297 | DLLAPI void FCGX_Finish(void); |
298 | |
299 | /* |
300 | *---------------------------------------------------------------------- |
301 | * |
302 | * FCGX_StartFilterData -- |
303 | * |
304 | * stream is an input stream for a FCGI_FILTER request. |
305 | * stream is positioned at EOF on FCGI_STDIN. |
306 | * Repositions stream to the start of FCGI_DATA. |
307 | * If the preconditions are not met (e.g. FCGI_STDIN has not |
308 | * been read to EOF) sets the stream error code to |
309 | * FCGX_CALL_SEQ_ERROR. |
310 | * |
311 | * Results: |
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312 | * 0 for a normal return, < 0 for error |
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313 | * |
314 | *---------------------------------------------------------------------- |
315 | */ |
316 | DLLAPI int FCGX_StartFilterData(FCGX_Stream *stream); |
317 | |
318 | /* |
319 | *---------------------------------------------------------------------- |
320 | * |
321 | * FCGX_SetExitStatus -- |
322 | * |
323 | * Sets the exit status for stream's request. The exit status |
324 | * is the status code the request would have exited with, had |
325 | * the request been run as a CGI program. You can call |
326 | * SetExitStatus several times during a request; the last call |
327 | * before the request ends determines the value. |
328 | * |
329 | *---------------------------------------------------------------------- |
330 | */ |
331 | DLLAPI void FCGX_SetExitStatus(int status, FCGX_Stream *stream); |
332 | \f |
333 | /* |
334 | *====================================================================== |
335 | * Parameters |
336 | *====================================================================== |
337 | */ |
338 | |
339 | /* |
340 | *---------------------------------------------------------------------- |
341 | * |
342 | * FCGX_GetParam -- obtain value of FCGI parameter in environment |
343 | * |
344 | * |
345 | * Results: |
346 | * Value bound to name, NULL if name not present in the |
347 | * environment envp. Caller must not mutate the result |
348 | * or retain it past the end of this request. |
349 | * |
350 | *---------------------------------------------------------------------- |
351 | */ |
352 | DLLAPI char *FCGX_GetParam(const char *name, FCGX_ParamArray envp); |
353 | \f |
354 | /* |
355 | *====================================================================== |
356 | * Readers |
357 | *====================================================================== |
358 | */ |
359 | |
360 | /* |
361 | *---------------------------------------------------------------------- |
362 | * |
363 | * FCGX_GetChar -- |
364 | * |
365 | * Reads a byte from the input stream and returns it. |
366 | * |
367 | * Results: |
368 | * The byte, or EOF (-1) if the end of input has been reached. |
369 | * |
370 | *---------------------------------------------------------------------- |
371 | */ |
372 | DLLAPI int FCGX_GetChar(FCGX_Stream *stream); |
373 | |
374 | /* |
375 | *---------------------------------------------------------------------- |
376 | * |
377 | * FCGX_UnGetChar -- |
378 | * |
379 | * Pushes back the character c onto the input stream. One |
380 | * character of pushback is guaranteed once a character |
381 | * has been read. No pushback is possible for EOF. |
382 | * |
383 | * Results: |
384 | * Returns c if the pushback succeeded, EOF if not. |
385 | * |
386 | *---------------------------------------------------------------------- |
387 | */ |
388 | DLLAPI int FCGX_UnGetChar(int c, FCGX_Stream *stream); |
389 | |
390 | /* |
391 | *---------------------------------------------------------------------- |
392 | * |
393 | * FCGX_GetStr -- |
394 | * |
395 | * Reads up to n consecutive bytes from the input stream |
396 | * into the character array str. Performs no interpretation |
397 | * of the input bytes. |
398 | * |
399 | * Results: |
400 | * Number of bytes read. If result is smaller than n, |
401 | * the end of input has been reached. |
402 | * |
403 | *---------------------------------------------------------------------- |
404 | */ |
405 | DLLAPI int FCGX_GetStr(char *str, int n, FCGX_Stream *stream); |
406 | |
407 | /* |
408 | *---------------------------------------------------------------------- |
409 | * |
410 | * FCGX_GetLine -- |
411 | * |
412 | * Reads up to n-1 consecutive bytes from the input stream |
413 | * into the character array str. Stops before n-1 bytes |
414 | * have been read if '\n' or EOF is read. The terminating '\n' |
415 | * is copied to str. After copying the last byte into str, |
416 | * stores a '\0' terminator. |
417 | * |
418 | * Results: |
419 | * NULL if EOF is the first thing read from the input stream, |
420 | * str otherwise. |
421 | * |
422 | *---------------------------------------------------------------------- |
423 | */ |
424 | DLLAPI char *FCGX_GetLine(char *str, int n, FCGX_Stream *stream); |
425 | |
426 | /* |
427 | *---------------------------------------------------------------------- |
428 | * |
429 | * FCGX_HasSeenEOF -- |
430 | * |
431 | * Returns EOF if end-of-file has been detected while reading |
432 | * from stream; otherwise returns 0. |
433 | * |
434 | * Note that FCGX_HasSeenEOF(s) may return 0, yet an immediately |
435 | * following FCGX_GetChar(s) may return EOF. This function, like |
436 | * the standard C stdio function feof, does not provide the |
437 | * ability to peek ahead. |
438 | * |
439 | * Results: |
440 | * EOF if end-of-file has been detected, 0 if not. |
441 | * |
442 | *---------------------------------------------------------------------- |
443 | */ |
444 | |
445 | DLLAPI int FCGX_HasSeenEOF(FCGX_Stream *stream); |
446 | \f |
447 | /* |
448 | *====================================================================== |
449 | * Writers |
450 | *====================================================================== |
451 | */ |
452 | |
453 | /* |
454 | *---------------------------------------------------------------------- |
455 | * |
456 | * FCGX_PutChar -- |
457 | * |
458 | * Writes a byte to the output stream. |
459 | * |
460 | * Results: |
461 | * The byte, or EOF (-1) if an error occurred. |
344bf056 |
462 | * |
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463 | *---------------------------------------------------------------------- |
464 | */ |
465 | DLLAPI int FCGX_PutChar(int c, FCGX_Stream *stream); |
466 | |
467 | /* |
468 | *---------------------------------------------------------------------- |
469 | * |
470 | * FCGX_PutStr -- |
471 | * |
472 | * Writes n consecutive bytes from the character array str |
473 | * into the output stream. Performs no interpretation |
474 | * of the output bytes. |
475 | * |
476 | * Results: |
477 | * Number of bytes written (n) for normal return, |
478 | * EOF (-1) if an error occurred. |
344bf056 |
479 | * |
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480 | *---------------------------------------------------------------------- |
481 | */ |
482 | DLLAPI int FCGX_PutStr(const char *str, int n, FCGX_Stream *stream); |
483 | |
484 | /* |
485 | *---------------------------------------------------------------------- |
486 | * |
487 | * FCGX_PutS -- |
488 | * |
489 | * Writes a null-terminated character string to the output stream. |
490 | * |
491 | * Results: |
492 | * number of bytes written for normal return, |
493 | * EOF (-1) if an error occurred. |
344bf056 |
494 | * |
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495 | *---------------------------------------------------------------------- |
496 | */ |
497 | DLLAPI int FCGX_PutS(const char *str, FCGX_Stream *stream); |
498 | |
499 | /* |
500 | *---------------------------------------------------------------------- |
501 | * |
502 | * FCGX_FPrintF, FCGX_VFPrintF -- |
503 | * |
504 | * Performs printf-style output formatting and writes the results |
505 | * to the output stream. |
506 | * |
507 | * Results: |
508 | * number of bytes written for normal return, |
509 | * EOF (-1) if an error occurred. |
344bf056 |
510 | * |
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511 | *---------------------------------------------------------------------- |
512 | */ |
513 | DLLAPI int FCGX_FPrintF(FCGX_Stream *stream, const char *format, ...); |
514 | |
515 | DLLAPI int FCGX_VFPrintF(FCGX_Stream *stream, const char *format, va_list arg); |
516 | |
517 | /* |
518 | *---------------------------------------------------------------------- |
519 | * |
520 | * FCGX_FFlush -- |
521 | * |
522 | * Flushes any buffered output. |
523 | * |
524 | * Server-push is a legitimate application of FCGX_FFlush. |
525 | * Otherwise, FCGX_FFlush is not very useful, since FCGX_Accept |
526 | * does it implicitly. Calling FCGX_FFlush in non-push applications |
527 | * results in extra writes and therefore reduces performance. |
528 | * |
529 | * Results: |
530 | * EOF (-1) if an error occurred. |
344bf056 |
531 | * |
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532 | *---------------------------------------------------------------------- |
533 | */ |
534 | DLLAPI int FCGX_FFlush(FCGX_Stream *stream); |
535 | \f |
536 | /* |
537 | *====================================================================== |
538 | * Both Readers and Writers |
539 | *====================================================================== |
540 | */ |
541 | |
542 | /* |
543 | *---------------------------------------------------------------------- |
544 | * |
545 | * FCGX_FClose -- |
546 | * |
547 | * Closes the stream. For writers, flushes any buffered |
548 | * output. |
549 | * |
550 | * Close is not a very useful operation since FCGX_Accept |
551 | * does it implicitly. Closing the out stream before the |
552 | * err stream results in an extra write if there's nothing |
553 | * in the err stream, and therefore reduces performance. |
554 | * |
555 | * Results: |
556 | * EOF (-1) if an error occurred. |
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557 | * |
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558 | *---------------------------------------------------------------------- |
559 | */ |
560 | DLLAPI int FCGX_FClose(FCGX_Stream *stream); |
561 | |
562 | /* |
563 | *---------------------------------------------------------------------- |
564 | * |
565 | * FCGX_GetError -- |
566 | * |
567 | * Return the stream error code. 0 means no error, > 0 |
568 | * is an errno(2) error, < 0 is an FastCGI error. |
569 | * |
570 | *---------------------------------------------------------------------- |
571 | */ |
572 | DLLAPI int FCGX_GetError(FCGX_Stream *stream); |
573 | |
574 | /* |
575 | *---------------------------------------------------------------------- |
576 | * |
577 | * FCGX_ClearError -- |
578 | * |
579 | * Clear the stream error code and end-of-file indication. |
580 | * |
581 | *---------------------------------------------------------------------- |
582 | */ |
583 | DLLAPI void FCGX_ClearError(FCGX_Stream *stream); |
584 | |
585 | |
586 | #if defined (__cplusplus) || defined (c_plusplus) |
587 | } /* terminate extern "C" { */ |
588 | #endif |
589 | |
590 | #endif /* _FCGIAPP_H */ |