1 /*
2  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "telescope.h"
18 
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <stdlib.h>
22 #include <unistd.h>
23 
24 int
25 mark_nonblock(int fd)
26 {
27 	int flags;
28 
29 	if ((flags = fcntl(fd, F_GETFL)) == -1)
30                 return 0;
31 	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
32                 return 0;
33 	return 1;
34 }
35 
36 int
37 has_prefix(const char *str, const char *prfx)
38 {
39 	size_t i;
40 
41 	for (i = 0; str[i] != '\0' && prfx[i] != '\0'; ++i)
42 		if (str[i] != prfx[i])
43 			return 0;
44 	return prfx[i] == '\0';
45 }
46 
47 void
48 dispatch_imsg(struct imsgbuf *ibuf, imsg_handlerfn **handlers, size_t size)
49 {
50 	struct imsg	imsg;
51 	size_t		datalen, i;
52 	ssize_t		n;
53 
54 	if ((n = imsg_read(ibuf)) == -1) {
55 		if (errno == EAGAIN || errno == EWOULDBLOCK)
56 			return;
57                 _exit(1);
58 	}
59 
60 	if (n == 0)
61 		_exit(1);
62 
63 	for (;;) {
64 		if ((n = imsg_get(ibuf, &imsg)) == -1)
65 			_exit(1);
66 		if (n == 0)
67 			return;
68 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
69 		i = imsg.hdr.type;
70 		if (i >= (size / sizeof(imsg_handlerfn*)) || handlers[i] == NULL)
71 			abort();
72 		handlers[i](&imsg, datalen);
73 		imsg_free(&imsg);
74 	}
75 }