Annotation of embedaddon/mpd/src/contrib/libpdel/io/timeout_fp.c, revision 1.1.1.1
1.1 misho 1:
2: /*
3: * Copyright (c) 2001-2002 Packet Design, LLC.
4: * All rights reserved.
5: *
6: * Subject to the following obligations and disclaimer of warranty,
7: * use and redistribution of this software, in source or object code
8: * forms, with or without modifications are expressly permitted by
9: * Packet Design; provided, however, that:
10: *
11: * (i) Any and all reproductions of the source or object code
12: * must include the copyright notice above and the following
13: * disclaimer of warranties; and
14: * (ii) No rights are granted, in any manner or form, to use
15: * Packet Design trademarks, including the mark "PACKET DESIGN"
16: * on advertising, endorsements, or otherwise except as such
17: * appears in the above copyright notice or in the software.
18: *
19: * THIS SOFTWARE IS BEING PROVIDED BY PACKET DESIGN "AS IS", AND
20: * TO THE MAXIMUM EXTENT PERMITTED BY LAW, PACKET DESIGN MAKES NO
21: * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING
22: * THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED
23: * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
24: * OR NON-INFRINGEMENT. PACKET DESIGN DOES NOT WARRANT, GUARANTEE,
25: * OR MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS
26: * OF THE USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY,
27: * RELIABILITY OR OTHERWISE. IN NO EVENT SHALL PACKET DESIGN BE
28: * LIABLE FOR ANY DAMAGES RESULTING FROM OR ARISING OUT OF ANY USE
29: * OF THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY DIRECT,
30: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL
31: * DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOSS OF
32: * USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY THEORY OF
33: * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
35: * THE USE OF THIS SOFTWARE, EVEN IF PACKET DESIGN IS ADVISED OF
36: * THE POSSIBILITY OF SUCH DAMAGE.
37: *
38: * Author: Archie Cobbs <archie@freebsd.org>
39: */
40:
41: #include <sys/types.h>
42: #include <sys/time.h>
43:
44: #include <stdio.h>
45: #include <stdlib.h>
46: #include <stdarg.h>
47: #include <syslog.h>
48: #include <string.h>
49: #include <unistd.h>
50: #include <errno.h>
51: #include <poll.h>
52:
53: #include "structs/structs.h"
54: #include "structs/type/array.h"
55:
56: #include "io/timeout_fp.h"
57: #include "util/typed_mem.h"
58:
59: #define MEM_TYPE "timeout_fp"
60:
61: struct fdt_info {
62: int fd;
63: int timeout;
64: };
65:
66: typedef int fun_reader(void *cookie, char *buf, int len);
67: typedef int fun_writer(void *cookie, const char *buf, int len);
68:
69: /*
70: * Internal functions
71: */
72: static int timeout_fp_readwrite(struct fdt_info *fdt,
73: char *buf, int len, int wr);
74: static int timeout_fp_close(void *cookie);
75:
76: static fun_reader timeout_fp_read;
77: static fun_writer timeout_fp_write;
78:
79: /*
80: * Same as fdopen(3) but with a timeout.
81: */
82: FILE *
83: timeout_fdopen(int fd, const char *mode, int timeout)
84: {
85: fun_reader *reader = NULL;
86: fun_writer *writer = NULL;
87: struct fdt_info *fdt;
88: const char *s;
89: FILE *fp;
90:
91: /* If no timeout, fall back to normal case */
92: if (timeout <= 0)
93: return (fdopen(fd, mode));
94:
95: /* Create the info structure */
96: if ((fdt = MALLOC(MEM_TYPE, sizeof(*fdt))) == NULL)
97: return (NULL);
98: memset(fdt, 0, sizeof(*fdt));
99: fdt->fd = fd;
100: fdt->timeout = timeout;
101:
102: /* Get reader & writer functions */
103: for (s = mode; *s != '\0'; s++) {
104: switch (*s) {
105: case 'r':
106: reader = timeout_fp_read;
107: break;
108: case 'w':
109: case 'a':
110: writer = timeout_fp_write;
111: break;
112: case '+':
113: reader = timeout_fp_read;
114: writer = timeout_fp_write;
115: break;
116: }
117: }
118:
119: /* Get FILE * wrapper */
120: if ((fp = funopen(fdt, reader, writer,
121: NULL, timeout_fp_close)) == NULL) {
122: FREE(MEM_TYPE, fdt);
123: return (NULL);
124: }
125:
126: /* Done */
127: return (fp);
128: }
129:
130: static int
131: timeout_fp_read(void *cookie, char *buf, int len)
132: {
133: struct fdt_info *const fdt = cookie;
134:
135: return (timeout_fp_readwrite(fdt, buf, len, 0));
136: }
137:
138: static int
139: timeout_fp_write(void *cookie, const char *buf, int len)
140: {
141: struct fdt_info *const fdt = cookie;
142:
143: return (timeout_fp_readwrite(fdt, (char *)buf, len, 1));
144: }
145:
146: /*
147: * Do the threaded read or write depending on the value of 'wr'.
148: */
149: static int
150: timeout_fp_readwrite(struct fdt_info *fdt, char *buf, int len, int wr)
151: {
152: struct pollfd pfd;
153: int nfds;
154:
155: /* Set up read/write poll(2) event */
156: memset(&pfd, 0, sizeof(pfd));
157: pfd.fd = fdt->fd;
158: pfd.events = wr ? POLLWRNORM : POLLRDNORM;
159:
160: /* Wait for readability or writability */
161: if ((nfds = poll(&pfd, 1, fdt->timeout * 1000)) == -1)
162: return (-1);
163:
164: /* Check for timeout */
165: if (nfds == 0) {
166: errno = ETIMEDOUT;
167: return (-1);
168: }
169:
170: /* Do I/O */
171: return (wr ? write(fdt->fd, buf, len) : read(fdt->fd, buf, len));
172: }
173:
174: /*
175: * Closer for timeout_fp streams.
176: */
177: static int
178: timeout_fp_close(void *cookie)
179: {
180: struct fdt_info *const fdt = cookie;
181: int r;
182:
183: r = close(fdt->fd);
184: FREE(MEM_TYPE, fdt);
185: return (r);
186: }
187:
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