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