/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <signal.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "copy.h"
#include "fd-util.h"
#include "locale-util.h"
#include "log.h"
#include "macro.h"
#include "pager.h"
#include "process-util.h"
#include "signal-util.h"
#include "string-util.h"
#include "terminal-util.h"
int r;
if (r < 0) {
log_error_errno(r, "Internal pager failed: %m");
}
}
const char *pager;
if (pager_pid > 0)
return 1;
if (!on_tty())
return 0;
if (!pager)
/* If the pager is explicitly turned off, honour it */
return 0;
/* Determine and cache number of columns before we spawn the
* pager so that we get the value from the actual tty */
(void) columns();
parent_pid = getpid();
if (pager_pid < 0)
/* In the child start the pager */
if (pager_pid == 0) {
(void) reset_all_signal_handlers();
(void) reset_signal_mask();
/* Initialize a good set of less options */
if (!less_opts)
less_opts = "FRSXMK";
if (jump_to_end)
/* Initialize a good charset for less. This is
* particularly important if we output UTF-8
* characters. */
if (!less_charset && is_locale_utf8())
less_charset = "utf-8";
if (less_charset)
/* Make sure the pager goes away when the parent dies */
/* Check whether our parent died before we were able
* to set the death signal */
if (getppid() != parent_pid)
if (pager) {
}
/* Debian's alternatives command for pagers is
* called 'pager'. Note that we do not call
* sensible-pagers here, since that is just a
* shell script that implements a logic that
* is similar to this one anyway, but is
* Debian-specific. */
/* not reached */
}
/* Return in the parent */
return 1;
}
void pager_close(void) {
if (pager_pid <= 0)
return;
/* Inform pager that we are done */
pager_pid = 0;
}
bool pager_have(void) {
return pager_pid > 0;
}
char *e = NULL;
size_t k;
int r;
if (e) {
} else
if (pid < 0)
if (pid == 0) {
/* Child */
(void) reset_all_signal_handlers();
(void) reset_signal_mask();
if (null_stdio) {
r = make_null_stdio();
if (r < 0) {
log_error_errno(r, "Failed to kill stdio: %m");
}
}
}
if (r < 0)
return r;
}