tools/perf/ui/tui/setup.c

Source file repositories/reference/linux-study-clean/tools/perf/ui/tui/setup.c

File Facts

System
Linux kernel
Corpus path
tools/perf/ui/tui/setup.c
Extension
.c
Size
3751 bytes
Lines
202
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <errno.h>
#include <signal.h>
#include <stdbool.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <linux/kernel.h>
#ifdef HAVE_BACKTRACE_SUPPORT
#include <execinfo.h>
#endif

#include "../../util/color.h"
#include "../../util/debug.h"
#include "../browser.h"
#include "../helpline.h"
#include "../ui.h"
#include "../util.h"
#include "../libslang.h"
#include "../keysyms.h"
#include "tui.h"

static volatile int ui__need_resize;

extern struct perf_error_ops perf_tui_eops;
extern bool tui_helpline__set;

extern void hist_browser__init_hpp(void);

void ui__refresh_dimensions(bool force)
{
	if (force || ui__need_resize) {
		ui__need_resize = 0;
		mutex_lock(&ui__lock);
		SLtt_get_screen_size();
		SLsmg_reinit_smg();
		mutex_unlock(&ui__lock);
	}
}

static void ui__sigwinch(int sig __maybe_unused)
{
	ui__need_resize = 1;
}

static void ui__setup_sigwinch(void)
{
	static bool done;

	if (done)
		return;

	done = true;
	pthread__unblock_sigwinch();
	signal(SIGWINCH, ui__sigwinch);
}

int ui__getch(int delay_secs)
{
	struct timeval timeout, *ptimeout = delay_secs ? &timeout : NULL;
	fd_set read_set;
	int err, key;

	ui__setup_sigwinch();

	FD_ZERO(&read_set);
	FD_SET(0, &read_set);

	if (delay_secs) {
		timeout.tv_sec = delay_secs;
		timeout.tv_usec = 0;
	}

        err = select(1, &read_set, NULL, NULL, ptimeout);

	if (err == 0)
		return K_TIMER;

	if (err == -1) {
		if (errno == EINTR)
			return K_RESIZE;
		return K_ERROR;
	}

	key = SLang_getkey();
	if (key != K_ESC)
		return key;

	FD_ZERO(&read_set);
	FD_SET(0, &read_set);
	timeout.tv_sec = 0;

Annotation

Implementation Notes