2 * Copyright (c) 2000-2002, 2004-2006 Sendmail, Inc. and its suppliers.
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
10 * By using this file, you agree to the terms and conditions set
11 * forth in the LICENSE file which can be found at the top level of
12 * the sendmail distribution.
14 * $Id: local.h,v 1.57 2006/02/28 18:48:25 ca Exp $
18 ** Information local to this implementation of stdio,
19 ** in particular, macros and private variables.
25 #endif /* !SM_CONF_MEMCHR */
28 int sm_flush __P((SM_FILE_T *, int *));
29 SM_FILE_T *smfp __P((void));
30 int sm_refill __P((SM_FILE_T *, int));
31 void sm_init __P((void));
32 void sm_cleanup __P((void));
33 void sm_makebuf __P((SM_FILE_T *));
34 int sm_whatbuf __P((SM_FILE_T *, size_t *, int *));
35 int sm_fwalk __P((int (*)(SM_FILE_T *, int *), int *));
36 int sm_wsetup __P((SM_FILE_T *));
37 int sm_flags __P((int));
38 SM_FILE_T *sm_fp __P((const SM_FILE_T *, const int, SM_FILE_T *));
39 int sm_vprintf __P((int, char const *, va_list));
41 /* std io functions */
42 ssize_t sm_stdread __P((SM_FILE_T *, char *, size_t));
43 ssize_t sm_stdwrite __P((SM_FILE_T *, char const *, size_t));
44 off_t sm_stdseek __P((SM_FILE_T *, off_t, int));
45 int sm_stdclose __P((SM_FILE_T *));
46 int sm_stdopen __P((SM_FILE_T *, const void *, int, const void *));
47 int sm_stdfdopen __P((SM_FILE_T *, const void *, int, const void *));
48 int sm_stdsetinfo __P((SM_FILE_T *, int , void *));
49 int sm_stdgetinfo __P((SM_FILE_T *, int , void *));
51 /* stdio io functions */
52 ssize_t sm_stdioread __P((SM_FILE_T *, char *, size_t));
53 ssize_t sm_stdiowrite __P((SM_FILE_T *, char const *, size_t));
54 off_t sm_stdioseek __P((SM_FILE_T *, off_t, int));
55 int sm_stdioclose __P((SM_FILE_T *));
56 int sm_stdioopen __P((SM_FILE_T *, const void *, int, const void *));
57 int sm_stdiosetinfo __P((SM_FILE_T *, int , void *));
58 int sm_stdiogetinfo __P((SM_FILE_T *, int , void *));
60 /* string io functions */
61 ssize_t sm_strread __P((SM_FILE_T *, char *, size_t));
62 ssize_t sm_strwrite __P((SM_FILE_T *, char const *, size_t));
63 off_t sm_strseek __P((SM_FILE_T *, off_t, int));
64 int sm_strclose __P((SM_FILE_T *));
65 int sm_stropen __P((SM_FILE_T *, const void *, int, const void *));
66 int sm_strsetinfo __P((SM_FILE_T *, int , void *));
67 int sm_strgetinfo __P((SM_FILE_T *, int , void *));
69 /* syslog io functions */
70 ssize_t sm_syslogread __P((SM_FILE_T *, char *, size_t));
71 ssize_t sm_syslogwrite __P((SM_FILE_T *, char const *, size_t));
72 off_t sm_syslogseek __P((SM_FILE_T *, off_t, int));
73 int sm_syslogclose __P((SM_FILE_T *));
74 int sm_syslogopen __P((SM_FILE_T *, const void *, int, const void *));
75 int sm_syslogsetinfo __P((SM_FILE_T *, int , void *));
76 int sm_sysloggetinfo __P((SM_FILE_T *, int , void *));
78 extern bool Sm_IO_DidInit;
80 /* Return true iff the given SM_FILE_T cannot be written now. */
81 #define cantwrite(fp) \
82 ((((fp)->f_flags & SMWR) == 0 || (fp)->f_bf.smb_base == NULL) && \
86 ** Test whether the given stdio file has an active ungetc buffer;
87 ** release such a buffer, without restoring ordinary unread data.
90 #define HASUB(fp) ((fp)->f_ub.smb_base != NULL)
93 if ((fp)->f_ub.smb_base != (fp)->f_ubuf) \
94 sm_free((char *)(fp)->f_ub.smb_base); \
95 (fp)->f_ub.smb_base = NULL; \
98 extern const char SmFileMagic[];
100 #define SM_ALIGN(p) (((unsigned long)(p) + SM_ALIGN_BITS) & ~SM_ALIGN_BITS)
102 #define sm_io_flockfile(fp) ((void) 0)
103 #define sm_io_funlockfile(fp) ((void) 0)
106 # define FDSET_CAST /* empty cast for fd_set arg to select */
110 ** SM_CONVERT_TIME -- convert the API timeout flag for select() usage.
112 ** This takes a 'fp' (a file type pointer) and obtains the "raw"
113 ** file descriptor (fd) if possible. The 'fd' is needed to possibly
114 ** switch the mode of the file (blocking/non-blocking) to match
115 ** the type of timeout. If timeout is SM_TIME_FOREVER then the
116 ** timeout using select won't be needed and the file is best placed
117 ** in blocking mode. If there is to be a finite timeout then the file
118 ** is best placed in non-blocking mode. Then, if not enough can be
119 ** written, select() can be used to test when something can be written
120 ** yet still timeout if the wait is too long.
121 ** If the mode is already in the correct state we don't change it.
122 ** Iff (yes "iff") the 'fd' is "-1" in value then the mode change
123 ** will not happen. This situation arises when a late-binding-to-disk
124 ** file type is in use. An example of this is the sendmail buffered
125 ** file type (in sendmail/bf.c).
128 ** fp -- the file pointer the timeout is for
129 ** fd -- to become the file descriptor value from 'fp'
130 ** val -- the timeout value to be converted
131 ** time -- a struct timeval holding the converted value
134 ** nothing, this is flow-through code
137 ** May or may not change the mode of a currently open file.
138 ** The file mode may be changed to O_NONBLOCK or ~O_NONBLOCK
139 ** (meaning block). This is done to best match the type of
140 ** timeout and for (possible) use with select().
143 # define SM_CONVERT_TIME(fp, fd, val, time) { \
144 if (((fd) = sm_io_getinfo(fp, SM_IO_WHAT_FD, NULL)) == -1) \
146 /* can't get an fd, likely internal 'fake' fp */ \
149 if ((val) == SM_TIME_DEFAULT) \
150 (val) = (fp)->f_timeout; \
151 if ((val) == SM_TIME_IMMEDIATE || (val) == SM_TIME_FOREVER) \
153 (time)->tv_sec = 0; \
154 (time)->tv_usec = 0; \
158 (time)->tv_sec = (val) / 1000; \
159 (time)->tv_usec = ((val) - ((time)->tv_sec * 1000)) * 1000; \
161 if ((val) == SM_TIME_FOREVER) \
163 if ((fp)->f_timeoutstate == SM_TIME_NONBLOCK && (fd) != -1) \
166 ret = fcntl((fd), F_GETFL, 0); \
167 if (ret == -1 || fcntl((fd), F_SETFL, \
168 ret & ~O_NONBLOCK) == -1) \
170 /* errno should be set */ \
173 (fp)->f_timeoutstate = SM_TIME_BLOCK; \
174 if ((fp)->f_modefp != NULL) \
175 (fp)->f_modefp->f_timeoutstate = SM_TIME_BLOCK; \
179 if ((fp)->f_timeoutstate == SM_TIME_BLOCK && (fd) != -1) \
182 ret = fcntl((fd), F_GETFL, 0); \
183 if (ret == -1 || fcntl((fd), F_SETFL, \
184 ret | O_NONBLOCK) == -1) \
186 /* errno should be set */ \
189 (fp)->f_timeoutstate = SM_TIME_NONBLOCK; \
190 if ((fp)->f_modefp != NULL) \
191 (fp)->f_modefp->f_timeoutstate = SM_TIME_NONBLOCK; \
197 ** SM_IO_WR_TIMEOUT -- setup the timeout for the write
199 ** This #define uses a select() to wait for the 'fd' to become writable.
200 ** The select() can be active for up to 'to' time. The select may not
201 ** use all of the the 'to' time. Hence, the amount of "wall-clock" time is
202 ** measured to decide how much to subtract from 'to' to update it. On some
203 ** BSD-based/like systems the timeout for a select is updated for the
204 ** amount of time used. On many/most systems this does not happen. Therefore
205 ** the updating of 'to' must be done ourselves; a copy of 'to' is passed
206 ** since a BSD-like system will have updated it and we don't want to
207 ** double the time used!
208 ** Note: if a valid 'fd' doesn't exist yet, don't use this (e.g. the
209 ** sendmail buffered file type in sendmail/bf.c; see fvwrite.c).
212 ** fd -- a file descriptor for doing select() with
213 ** timeout -- the original user set value.
216 ** nothing, this is flow through code
219 ** adjusts 'timeout' for time used
222 #define SM_IO_WR_TIMEOUT(fp, fd, to) { \
223 struct timeval sm_io_to_before, sm_io_to_after, sm_io_to_diff; \
224 struct timeval sm_io_to; \
226 fd_set sm_io_to_mask, sm_io_x_mask; \
228 if ((to) == SM_TIME_DEFAULT) \
229 (to) = (fp)->f_timeout; \
230 if ((to) == SM_TIME_IMMEDIATE) \
235 else if ((to) == SM_TIME_FOREVER) \
242 sm_io_to.tv_sec = (to) / 1000; \
243 sm_io_to.tv_usec = ((to) - (sm_io_to.tv_sec * 1000)) * 1000; \
245 if (FD_SETSIZE > 0 && (fd) >= FD_SETSIZE) \
250 FD_ZERO(&sm_io_to_mask); \
251 FD_SET((fd), &sm_io_to_mask); \
252 FD_ZERO(&sm_io_x_mask); \
253 FD_SET((fd), &sm_io_x_mask); \
254 if (gettimeofday(&sm_io_to_before, NULL) < 0) \
258 sm_io_to_sel = select((fd) + 1, NULL, &sm_io_to_mask, \
259 &sm_io_x_mask, &sm_io_to); \
260 } while (sm_io_to_sel < 0 && errno == EINTR); \
261 if (sm_io_to_sel < 0) \
263 /* something went wrong, errno set */ \
266 else if (sm_io_to_sel == 0) \
272 /* else loop again */ \
273 if (gettimeofday(&sm_io_to_after, NULL) < 0) \
275 timersub(&sm_io_to_after, &sm_io_to_before, &sm_io_to_diff); \
276 (to) -= (sm_io_to_diff.tv_sec * 1000); \
277 (to) -= (sm_io_to_diff.tv_usec / 1000); \
283 ** If there is no 'fd' just error (we can't timeout). If the timeout
284 ** is SM_TIME_FOREVER then there is no need to do a timeout with
285 ** select since this will be a real error. If the error is not
286 ** EAGAIN/EWOULDBLOCK (from a nonblocking) then it's a real error.
287 ** Specify the condition here as macro so it can be used in several places.
290 #define IS_IO_ERROR(fd, ret, to) \
292 ((ret) < 0 && errno != EAGAIN && errno != EWOULDBLOCK) || \
293 (to) == SM_TIME_FOREVER)