mirror of
https://git.kernel.org/pub/scm/bluetooth/bluez.git
synced 2024-12-02 08:34:26 +08:00
231cf864f1
This makes num_columns always return valid number of columns, which is expected by print_packets function. This also fix garbage prints while using btmon via adb shell.
172 lines
3.2 KiB
C
172 lines
3.2 KiB
C
/*
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*
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* BlueZ - Bluetooth protocol stack for Linux
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*
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* Copyright (C) 2011-2012 Intel Corporation
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* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <sys/prctl.h>
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#include <sys/ioctl.h>
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#include <termios.h>
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#include "display.h"
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static pid_t pager_pid = 0;
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bool use_color(void)
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{
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static int cached_use_color = -1;
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if (__builtin_expect(!!(cached_use_color < 0), 0))
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cached_use_color = isatty(STDOUT_FILENO) > 0 || pager_pid > 0;
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return cached_use_color;
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}
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int num_columns(void)
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{
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static int cached_num_columns = -1;
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if (__builtin_expect(!!(cached_num_columns < 0), 0)) {
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struct winsize ws;
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if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) < 0 ||
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ws.ws_col == 0)
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cached_num_columns = FALLBACK_TERMINAL_WIDTH;
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else
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cached_num_columns = ws.ws_col;
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}
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return cached_num_columns;
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}
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static void close_pipe(int p[])
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{
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if (p[0] >= 0)
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close(p[0]);
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if (p[1] >= 0)
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close(p[1]);
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}
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static void wait_for_terminate(pid_t pid)
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{
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siginfo_t dummy;
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for (;;) {
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memset(&dummy, 0, sizeof(dummy));
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if (waitid(P_PID, pid, &dummy, WEXITED) < 0) {
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if (errno == EINTR)
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continue;
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return;
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}
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return;
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}
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}
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void open_pager(void)
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{
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const char *pager;
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pid_t parent_pid;
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int fd[2];
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if (pager_pid > 0)
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return;
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pager = getenv("PAGER");
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if (pager) {
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if (!*pager || strcmp(pager, "cat") == 0)
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return;
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}
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if (!(isatty(STDOUT_FILENO) > 0))
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return;
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num_columns();
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if (pipe(fd) < 0) {
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perror("Failed to create pager pipe");
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return;
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}
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parent_pid = getpid();
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pager_pid = fork();
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if (pager_pid < 0) {
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perror("Failed to fork pager");
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close_pipe(fd);
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return;
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}
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if (pager_pid == 0) {
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dup2(fd[0], STDIN_FILENO);
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close_pipe(fd);
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setenv("LESS", "FRSX", 0);
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if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
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_exit(EXIT_FAILURE);
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if (getppid() != parent_pid)
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_exit(EXIT_SUCCESS);
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if (pager) {
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execlp(pager, pager, NULL);
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execl("/bin/sh", "sh", "-c", pager, NULL);
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}
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execlp("pager", "pager", NULL);
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execlp("less", "less", NULL);
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execlp("more", "more", NULL);
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_exit(EXIT_FAILURE);
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}
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if (dup2(fd[1], STDOUT_FILENO) < 0) {
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perror("Failed to duplicate pager pipe");
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return;
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}
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close_pipe(fd);
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}
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void close_pager(void)
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{
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if (pager_pid <= 0)
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return;
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fclose(stdout);
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kill(pager_pid, SIGCONT);
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wait_for_terminate(pager_pid);
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pager_pid = 0;
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}
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