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
|
/*
* blogc: A blog compiler.
* Copyright (C) 2014-2018 Rafael G. Martins <rafael@rafaelmartins.eng.br>
*
* This program can be distributed under the terms of the BSD License.
* See the file LICENSE.
*/
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <errno.h>
#include "../common/utils.h"
#include "ctx.h"
#include "rules.h"
#include "reloader.h"
// we are not going to unit-test these functions, then printing errors
// directly is not a big issue
static pthread_mutex_t mutex_running = PTHREAD_MUTEX_INITIALIZER;
static bool running = false;
static int reloader_status_code = 0;
static void (*handler_func)(int) = NULL;
static void
sig_handler(int signum)
{
bm_reloader_stop(signum + 128);
}
int
bm_reloader_run(bm_ctx_t **ctx, bm_rule_exec_func_t rule_exec,
bc_slist_t *outputs, bc_trie_t *args)
{
// install ^C handler
struct sigaction current_action;
if (sigaction(SIGINT, NULL, ¤t_action) < 0) {
fprintf(stderr, "blogc-make: failed to run reloader: %s\n", strerror(errno));
return 3;
}
if (current_action.sa_handler != sig_handler) { // not installed yet
// backup current handler
pthread_mutex_lock(&mutex_running);
handler_func = current_action.sa_handler;
pthread_mutex_unlock(&mutex_running);
// set new handler
struct sigaction new_action;
new_action.sa_handler = sig_handler;
sigemptyset(&new_action.sa_mask);
new_action.sa_flags = 0;
if (sigaction(SIGINT, &new_action, NULL) < 0) {
fprintf(stderr, "blogc-make: failed to run reloader: %s\n",
strerror(errno));
return 3;
}
}
pthread_mutex_lock(&mutex_running);
running = true;
pthread_mutex_unlock(&mutex_running);
while (running) {
if (!bm_ctx_reload(ctx)) {
fprintf(stderr, "blogc-make: warning: failed to reload context. "
"retrying in 5 seconds ...\n\n");
sleep(5);
continue;
}
if (0 != rule_exec(*ctx, outputs, args)) {
fprintf(stderr, "blogc-make: warning: failed to rebuild website. "
"retrying in 5 seconds ...\n\n");
sleep(5);
continue;
}
sleep(1);
}
return reloader_status_code;
}
void
bm_reloader_stop(int status_code)
{
pthread_mutex_lock(&mutex_running);
running = false;
reloader_status_code = status_code;
// reraise if SIGINT
if (status_code == SIGINT + 128) {
// reinstall old ^C handler
struct sigaction new_action;
new_action.sa_handler = handler_func;
sigemptyset(&new_action.sa_mask);
new_action.sa_flags = 0;
sigaction(SIGINT, &new_action, NULL);
// run it
raise(SIGINT);
// SIGINT will usually kill the process, but in the case that the
// `handler_func` prevents it, our custom handler will be reinstalled
// by `bm_reloader_run`.
}
pthread_mutex_unlock(&mutex_running);
}
|
