1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/**
* Copyright © 2015 Mattias Andrée <maandree@member.fsf.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "daemon.h"
/**
* Wrapper for `read` that reads all available data.
*
* Sets `errno` to `EBADMSG` on success.
*
* @param fd The file descriptor from which to to read.
* @param buf Output parameter for the data.
* @param n Output parameter for the number of read bytes.
* @return 0 on success, -1 on error.
*
* @throws Any exception specified for read(3).
* @throws Any exception specified for realloc(3).
*/
int
readall(int fd, char **buf, size_t *n)
{
char *buffer = NULL;
size_t ptr = 0;
size_t size = 0;
ssize_t got;
char *new;
int saved_errno;
for (;;) {
if (ptr == size) {
new = realloc(buffer, size <<= 1);
t (!new);
buffer = new;
}
got = read(fd, buffer + ptr, size - ptr);
t (got < 0);
if (got == 0)
break;
ptr += (size_t)got;
}
new = realloc(buffer, ptr);
*buf = new ? new : buffer;
*n = ptr;
return 0;
fail:
saved_errno = errno;
free(buffer);
errno = saved_errno;
return -1;
}
/**
* Unmarshal a `NULL`-terminated string array.
*
* The elements are not actually copied, subpointers
* to `buf` are stored in the returned list.
*
* @param buf The marshalled array. Must end with a NUL byte.
* @param len The length of `buf`.
* @param n Output parameter for the number of elements. May be `NULL`
* @return The list, `NULL` on error.
*
* @throws Any exception specified for realloc(3).
*/
char **
restore_array(char *buf, size_t len, size_t *n)
{
char **rc = malloc((len + 1) * sizeof(char*));
char **new;
size_t i, e = 0;
t (!rc);
while (i < len) {
rc[++e] = buf + i;
i += strlen(buf + i);
}
rc[e] = NULL;
new = realloc(rc, (e + 1) * sizeof(char*));
if (n)
*n = e;
return new ? new : rc;
fail:
return NULL;
}
/**
* Create `NULL`-terminate subcopy of an list,
*
* @param list The list.
* @param n The number of elements in the new sublist.
* @return The sublist, `NULL` on error.
*
* @throws Any exception specified for malloc(3).
*/
char **
sublist(char *const *list, size_t n)
{
char **rc = malloc((n + 1) * sizeof(char*));
t (!rc);
rc[n] = NULL;
while (n--)
rc[n] = list[n];
return rc;
fail:
return NULL;
}
/**
* Create a new open file descriptor for an already
* existing file descriptor.
*
* @param fd The file descriptor that shall be promoted
* to a new open file descriptor.
* @param oflag See open(3), `O_CREAT` is not allowed.
* @return 0 on success, -1 on error.
*/
int
reopen(int fd, int oflag)
{
char path[sizeof("/dev/fd/") + 3 * sizeof(int)];
int r, saved_errno;
sprintf(path, "/dev/fd/%i", fd);
r = open(path, oflag);
if (r < 0)
return -1;
if (dup2(r, fd) == -1)
return saved_errno = errno, close(r), errno = saved_errno, -1;
close(r);
return 0;
}
/**
* Send a string to a client.
*
* @param sockfd The file descriptor of the socket.
* @param outfd The file descriptor to which the client shall output the message.
* @param ... `NULL`-terminated list of string to concatenate.
* @return 0 on success, -1 on error.
*/
int
send_string(int sockfd, int outfd, ...)
{
return 0; /* TODO send_string */
(void) sockfd, (void) outfd;
}
/**
* Removes (and optionally runs) a job.
*
* @param jobno The job number, `NULL` for any job.
* @param runjob Shall we run the job too?
* @return 0 on success, -1 on error.
*
* @throws 0 The job is not in the queue.
*/
int
remove_job(const char *jobno, int runjob)
{
return 0; /* TODO remove_job */
(void) jobno, (void) runjob;
}
/**
* Get a `NULL` terminated list of all queued jobs.
*
* @return A `NULL` terminated list of all queued jobs. `NULL` on error.
*/
struct job **
get_jobs(void)
{
return NULL; /* TODO get_jobs */
}
|
