Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include <errno.h>
2#include <signal.h>
3#include <stdbool.h>
4#include <linux/kernel.h>
5#ifdef HAVE_BACKTRACE_SUPPORT
6#include <execinfo.h>
7#endif
8
9#include "../../util/cache.h"
10#include "../../util/debug.h"
11#include "../../util/util.h"
12#include "../browser.h"
13#include "../helpline.h"
14#include "../ui.h"
15#include "../util.h"
16#include "../libslang.h"
17#include "../keysyms.h"
18#include "tui.h"
19
20static volatile int ui__need_resize;
21
22extern struct perf_error_ops perf_tui_eops;
23extern bool tui_helpline__set;
24
25extern void hist_browser__init_hpp(void);
26
27void ui__refresh_dimensions(bool force)
28{
29 if (force || ui__need_resize) {
30 ui__need_resize = 0;
31 pthread_mutex_lock(&ui__lock);
32 SLtt_get_screen_size();
33 SLsmg_reinit_smg();
34 pthread_mutex_unlock(&ui__lock);
35 }
36}
37
38static void ui__sigwinch(int sig __maybe_unused)
39{
40 ui__need_resize = 1;
41}
42
43static void ui__setup_sigwinch(void)
44{
45 static bool done;
46
47 if (done)
48 return;
49
50 done = true;
51 pthread__unblock_sigwinch();
52 signal(SIGWINCH, ui__sigwinch);
53}
54
55int ui__getch(int delay_secs)
56{
57 struct timeval timeout, *ptimeout = delay_secs ? &timeout : NULL;
58 fd_set read_set;
59 int err, key;
60
61 ui__setup_sigwinch();
62
63 FD_ZERO(&read_set);
64 FD_SET(0, &read_set);
65
66 if (delay_secs) {
67 timeout.tv_sec = delay_secs;
68 timeout.tv_usec = 0;
69 }
70
71 err = select(1, &read_set, NULL, NULL, ptimeout);
72
73 if (err == 0)
74 return K_TIMER;
75
76 if (err == -1) {
77 if (errno == EINTR)
78 return K_RESIZE;
79 return K_ERROR;
80 }
81
82 key = SLang_getkey();
83 if (key != K_ESC)
84 return key;
85
86 FD_ZERO(&read_set);
87 FD_SET(0, &read_set);
88 timeout.tv_sec = 0;
89 timeout.tv_usec = 20;
90 err = select(1, &read_set, NULL, NULL, &timeout);
91 if (err == 0)
92 return K_ESC;
93
94 SLang_ungetkey(key);
95 return SLkp_getkey();
96}
97
98#ifdef HAVE_BACKTRACE_SUPPORT
99static void ui__signal_backtrace(int sig)
100{
101 void *stackdump[32];
102 size_t size;
103
104 ui__exit(false);
105 psignal(sig, "perf");
106
107 printf("-------- backtrace --------\n");
108 size = backtrace(stackdump, ARRAY_SIZE(stackdump));
109 backtrace_symbols_fd(stackdump, size, STDOUT_FILENO);
110
111 exit(0);
112}
113#else
114# define ui__signal_backtrace ui__signal
115#endif
116
117static void ui__signal(int sig)
118{
119 ui__exit(false);
120 psignal(sig, "perf");
121 exit(0);
122}
123
124int ui__init(void)
125{
126 int err;
127
128 SLutf8_enable(-1);
129 SLtt_get_terminfo();
130 SLtt_get_screen_size();
131
132 err = SLsmg_init_smg();
133 if (err < 0)
134 goto out;
135 err = SLang_init_tty(-1, 0, 0);
136 if (err < 0)
137 goto out;
138
139 err = SLkp_init();
140 if (err < 0) {
141 pr_err("TUI initialization failed.\n");
142 goto out;
143 }
144
145 SLkp_define_keysym((char *)"^(kB)", SL_KEY_UNTAB);
146
147 signal(SIGSEGV, ui__signal_backtrace);
148 signal(SIGFPE, ui__signal_backtrace);
149 signal(SIGINT, ui__signal);
150 signal(SIGQUIT, ui__signal);
151 signal(SIGTERM, ui__signal);
152
153 perf_error__register(&perf_tui_eops);
154
155 ui_helpline__init();
156 ui_browser__init();
157 tui_progress__init();
158
159 hist_browser__init_hpp();
160out:
161 return err;
162}
163
164void ui__exit(bool wait_for_ok)
165{
166 if (wait_for_ok && tui_helpline__set)
167 ui__question_window("Fatal Error",
168 ui_helpline__last_msg,
169 "Press any key...", 0);
170
171 SLtt_set_cursor_visibility(1);
172 SLsmg_refresh();
173 SLsmg_reset_smg();
174 SLang_reset_tty();
175
176 perf_error__unregister(&perf_tui_eops);
177}