Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include <newt.h>
2#include <signal.h>
3#include <stdbool.h>
4
5#include "../cache.h"
6#include "../debug.h"
7#include "browser.h"
8#include "helpline.h"
9#include "ui.h"
10#include "util.h"
11#include "libslang.h"
12#include "keysyms.h"
13
14pthread_mutex_t ui__lock = PTHREAD_MUTEX_INITIALIZER;
15
16static volatile int ui__need_resize;
17
18void ui__refresh_dimensions(bool force)
19{
20 if (force || ui__need_resize) {
21 ui__need_resize = 0;
22 pthread_mutex_lock(&ui__lock);
23 SLtt_get_screen_size();
24 SLsmg_reinit_smg();
25 pthread_mutex_unlock(&ui__lock);
26 }
27}
28
29static void ui__sigwinch(int sig __used)
30{
31 ui__need_resize = 1;
32}
33
34static void ui__setup_sigwinch(void)
35{
36 static bool done;
37
38 if (done)
39 return;
40
41 done = true;
42 pthread__unblock_sigwinch();
43 signal(SIGWINCH, ui__sigwinch);
44}
45
46int ui__getch(int delay_secs)
47{
48 struct timeval timeout, *ptimeout = delay_secs ? &timeout : NULL;
49 fd_set read_set;
50 int err, key;
51
52 ui__setup_sigwinch();
53
54 FD_ZERO(&read_set);
55 FD_SET(0, &read_set);
56
57 if (delay_secs) {
58 timeout.tv_sec = delay_secs;
59 timeout.tv_usec = 0;
60 }
61
62 err = select(1, &read_set, NULL, NULL, ptimeout);
63
64 if (err == 0)
65 return K_TIMER;
66
67 if (err == -1) {
68 if (errno == EINTR)
69 return K_RESIZE;
70 return K_ERROR;
71 }
72
73 key = SLang_getkey();
74 if (key != K_ESC)
75 return key;
76
77 FD_ZERO(&read_set);
78 FD_SET(0, &read_set);
79 timeout.tv_sec = 0;
80 timeout.tv_usec = 20;
81 err = select(1, &read_set, NULL, NULL, &timeout);
82 if (err == 0)
83 return K_ESC;
84
85 SLang_ungetkey(key);
86 return SLkp_getkey();
87}
88
89static void newt_suspend(void *d __used)
90{
91 newtSuspend();
92 raise(SIGTSTP);
93 newtResume();
94}
95
96static int ui__init(void)
97{
98 int err = SLkp_init();
99
100 if (err < 0)
101 goto out;
102
103 SLkp_define_keysym((char *)"^(kB)", SL_KEY_UNTAB);
104out:
105 return err;
106}
107
108static void ui__exit(void)
109{
110 SLtt_set_cursor_visibility(1);
111 SLsmg_refresh();
112 SLsmg_reset_smg();
113 SLang_reset_tty();
114}
115
116static void ui__signal(int sig)
117{
118 ui__exit();
119 psignal(sig, "perf");
120 exit(0);
121}
122
123void setup_browser(bool fallback_to_pager)
124{
125 if (!isatty(1) || !use_browser || dump_trace) {
126 use_browser = 0;
127 if (fallback_to_pager)
128 setup_pager();
129 return;
130 }
131
132 use_browser = 1;
133 newtInit();
134 ui__init();
135 newtSetSuspendCallback(newt_suspend, NULL);
136 ui_helpline__init();
137 ui_browser__init();
138
139 signal(SIGSEGV, ui__signal);
140 signal(SIGFPE, ui__signal);
141 signal(SIGINT, ui__signal);
142 signal(SIGQUIT, ui__signal);
143 signal(SIGTERM, ui__signal);
144}
145
146void exit_browser(bool wait_for_ok)
147{
148 if (use_browser > 0) {
149 if (wait_for_ok)
150 ui__question_window("Fatal Error",
151 ui_helpline__last_msg,
152 "Press any key...", 0);
153 ui__exit();
154 }
155}