cfeaa44a09
A number of fields do not apply to all processes, including: there a processes without a controlling tty, without parent process, without service, user services or session. To distuingish these cases from the case where we simply don't have the data, always return ENXIO for them, while returning ENODATA for the case where we really lack the information. Also update the credentials dumping code to show this properly. Fields that are known but do not apply are now shown as "n/a". Note that this also changes some of the calls in process-util.c and cgroup-util.c to return ENXIO for these cases.
1073 lines
28 KiB
C
1073 lines
28 KiB
C
/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <termios.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <time.h>
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#include <assert.h>
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#include <poll.h>
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#include <linux/vt.h>
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#include <linux/tiocl.h>
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#include <linux/kd.h>
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#include "terminal-util.h"
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#include "time-util.h"
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#include "process-util.h"
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#include "util.h"
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#include "fileio.h"
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#include "path-util.h"
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static volatile unsigned cached_columns = 0;
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static volatile unsigned cached_lines = 0;
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int chvt(int vt) {
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_cleanup_close_ int fd;
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fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
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if (fd < 0)
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return -errno;
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if (vt < 0) {
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int tiocl[2] = {
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TIOCL_GETKMSGREDIRECT,
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0
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};
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if (ioctl(fd, TIOCLINUX, tiocl) < 0)
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return -errno;
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vt = tiocl[0] <= 0 ? 1 : tiocl[0];
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}
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if (ioctl(fd, VT_ACTIVATE, vt) < 0)
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return -errno;
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return 0;
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}
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int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
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struct termios old_termios, new_termios;
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char c, line[LINE_MAX];
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assert(f);
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assert(ret);
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if (tcgetattr(fileno(f), &old_termios) >= 0) {
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new_termios = old_termios;
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new_termios.c_lflag &= ~ICANON;
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new_termios.c_cc[VMIN] = 1;
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new_termios.c_cc[VTIME] = 0;
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if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
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size_t k;
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if (t != USEC_INFINITY) {
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if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) {
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tcsetattr(fileno(f), TCSADRAIN, &old_termios);
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return -ETIMEDOUT;
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}
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}
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k = fread(&c, 1, 1, f);
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tcsetattr(fileno(f), TCSADRAIN, &old_termios);
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if (k <= 0)
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return -EIO;
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if (need_nl)
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*need_nl = c != '\n';
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*ret = c;
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return 0;
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}
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}
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if (t != USEC_INFINITY) {
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if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0)
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return -ETIMEDOUT;
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}
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errno = 0;
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if (!fgets(line, sizeof(line), f))
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return errno ? -errno : -EIO;
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truncate_nl(line);
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if (strlen(line) != 1)
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return -EBADMSG;
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if (need_nl)
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*need_nl = false;
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*ret = line[0];
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return 0;
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}
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int ask_char(char *ret, const char *replies, const char *text, ...) {
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int r;
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assert(ret);
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assert(replies);
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assert(text);
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for (;;) {
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va_list ap;
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char c;
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bool need_nl = true;
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if (on_tty())
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fputs(ANSI_HIGHLIGHT_ON, stdout);
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va_start(ap, text);
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vprintf(text, ap);
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va_end(ap);
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if (on_tty())
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fputs(ANSI_HIGHLIGHT_OFF, stdout);
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|
fflush(stdout);
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r = read_one_char(stdin, &c, USEC_INFINITY, &need_nl);
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if (r < 0) {
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|
if (r == -EBADMSG) {
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puts("Bad input, please try again.");
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continue;
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|
}
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|
putchar('\n');
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return r;
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|
}
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|
|
|
if (need_nl)
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|
putchar('\n');
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|
|
|
if (strchr(replies, c)) {
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|
*ret = c;
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|
return 0;
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|
}
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|
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|
puts("Read unexpected character, please try again.");
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|
}
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|
}
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|
int ask_string(char **ret, const char *text, ...) {
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|
assert(ret);
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|
assert(text);
|
|
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|
for (;;) {
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|
char line[LINE_MAX];
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va_list ap;
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|
|
|
if (on_tty())
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fputs(ANSI_HIGHLIGHT_ON, stdout);
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va_start(ap, text);
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vprintf(text, ap);
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va_end(ap);
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|
|
if (on_tty())
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fputs(ANSI_HIGHLIGHT_OFF, stdout);
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|
|
fflush(stdout);
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|
|
errno = 0;
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|
if (!fgets(line, sizeof(line), stdin))
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|
return errno ? -errno : -EIO;
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|
|
if (!endswith(line, "\n"))
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|
putchar('\n');
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|
else {
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|
char *s;
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|
|
|
if (isempty(line))
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|
continue;
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|
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|
truncate_nl(line);
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|
s = strdup(line);
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|
if (!s)
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|
return -ENOMEM;
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|
*ret = s;
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|
return 0;
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|
}
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|
}
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}
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|
int reset_terminal_fd(int fd, bool switch_to_text) {
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|
struct termios termios;
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|
int r = 0;
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|
/* Set terminal to some sane defaults */
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|
assert(fd >= 0);
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|
|
|
/* We leave locked terminal attributes untouched, so that
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|
* Plymouth may set whatever it wants to set, and we don't
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* interfere with that. */
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|
|
|
/* Disable exclusive mode, just in case */
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|
ioctl(fd, TIOCNXCL);
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|
|
/* Switch to text mode */
|
|
if (switch_to_text)
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|
ioctl(fd, KDSETMODE, KD_TEXT);
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|
|
|
/* Enable console unicode mode */
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|
ioctl(fd, KDSKBMODE, K_UNICODE);
|
|
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|
if (tcgetattr(fd, &termios) < 0) {
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|
r = -errno;
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|
goto finish;
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|
}
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|
|
|
/* We only reset the stuff that matters to the software. How
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|
* hardware is set up we don't touch assuming that somebody
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|
* else will do that for us */
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|
termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
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|
termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
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termios.c_oflag |= ONLCR;
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|
termios.c_cflag |= CREAD;
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|
termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
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|
termios.c_cc[VINTR] = 03; /* ^C */
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termios.c_cc[VQUIT] = 034; /* ^\ */
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termios.c_cc[VERASE] = 0177;
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termios.c_cc[VKILL] = 025; /* ^X */
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termios.c_cc[VEOF] = 04; /* ^D */
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termios.c_cc[VSTART] = 021; /* ^Q */
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termios.c_cc[VSTOP] = 023; /* ^S */
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termios.c_cc[VSUSP] = 032; /* ^Z */
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termios.c_cc[VLNEXT] = 026; /* ^V */
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termios.c_cc[VWERASE] = 027; /* ^W */
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termios.c_cc[VREPRINT] = 022; /* ^R */
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termios.c_cc[VEOL] = 0;
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termios.c_cc[VEOL2] = 0;
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|
termios.c_cc[VTIME] = 0;
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|
termios.c_cc[VMIN] = 1;
|
|
|
|
if (tcsetattr(fd, TCSANOW, &termios) < 0)
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|
r = -errno;
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|
|
|
finish:
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|
/* Just in case, flush all crap out */
|
|
tcflush(fd, TCIOFLUSH);
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|
|
return r;
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|
}
|
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|
|
int reset_terminal(const char *name) {
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|
_cleanup_close_ int fd = -1;
|
|
|
|
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
if (fd < 0)
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|
return fd;
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|
|
return reset_terminal_fd(fd, true);
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|
}
|
|
|
|
int open_terminal(const char *name, int mode) {
|
|
int fd, r;
|
|
unsigned c = 0;
|
|
|
|
/*
|
|
* If a TTY is in the process of being closed opening it might
|
|
* cause EIO. This is horribly awful, but unlikely to be
|
|
* changed in the kernel. Hence we work around this problem by
|
|
* retrying a couple of times.
|
|
*
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|
* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
|
|
*/
|
|
|
|
assert(!(mode & O_CREAT));
|
|
|
|
for (;;) {
|
|
fd = open(name, mode, 0);
|
|
if (fd >= 0)
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|
break;
|
|
|
|
if (errno != EIO)
|
|
return -errno;
|
|
|
|
/* Max 1s in total */
|
|
if (c >= 20)
|
|
return -errno;
|
|
|
|
usleep(50 * USEC_PER_MSEC);
|
|
c++;
|
|
}
|
|
|
|
r = isatty(fd);
|
|
if (r < 0) {
|
|
safe_close(fd);
|
|
return -errno;
|
|
}
|
|
|
|
if (!r) {
|
|
safe_close(fd);
|
|
return -ENOTTY;
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
int acquire_terminal(
|
|
const char *name,
|
|
bool fail,
|
|
bool force,
|
|
bool ignore_tiocstty_eperm,
|
|
usec_t timeout) {
|
|
|
|
int fd = -1, notify = -1, r = 0, wd = -1;
|
|
usec_t ts = 0;
|
|
|
|
assert(name);
|
|
|
|
/* We use inotify to be notified when the tty is closed. We
|
|
* create the watch before checking if we can actually acquire
|
|
* it, so that we don't lose any event.
|
|
*
|
|
* Note: strictly speaking this actually watches for the
|
|
* device being closed, it does *not* really watch whether a
|
|
* tty loses its controlling process. However, unless some
|
|
* rogue process uses TIOCNOTTY on /dev/tty *after* closing
|
|
* its tty otherwise this will not become a problem. As long
|
|
* as the administrator makes sure not configure any service
|
|
* on the same tty as an untrusted user this should not be a
|
|
* problem. (Which he probably should not do anyway.) */
|
|
|
|
if (timeout != USEC_INFINITY)
|
|
ts = now(CLOCK_MONOTONIC);
|
|
|
|
if (!fail && !force) {
|
|
notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0));
|
|
if (notify < 0) {
|
|
r = -errno;
|
|
goto fail;
|
|
}
|
|
|
|
wd = inotify_add_watch(notify, name, IN_CLOSE);
|
|
if (wd < 0) {
|
|
r = -errno;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
for (;;) {
|
|
struct sigaction sa_old, sa_new = {
|
|
.sa_handler = SIG_IGN,
|
|
.sa_flags = SA_RESTART,
|
|
};
|
|
|
|
if (notify >= 0) {
|
|
r = flush_fd(notify);
|
|
if (r < 0)
|
|
goto fail;
|
|
}
|
|
|
|
/* We pass here O_NOCTTY only so that we can check the return
|
|
* value TIOCSCTTY and have a reliable way to figure out if we
|
|
* successfully became the controlling process of the tty */
|
|
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
/* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
|
|
* if we already own the tty. */
|
|
assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
|
|
|
|
/* First, try to get the tty */
|
|
if (ioctl(fd, TIOCSCTTY, force) < 0)
|
|
r = -errno;
|
|
|
|
assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
|
|
|
|
/* Sometimes it makes sense to ignore TIOCSCTTY
|
|
* returning EPERM, i.e. when very likely we already
|
|
* are have this controlling terminal. */
|
|
if (r < 0 && r == -EPERM && ignore_tiocstty_eperm)
|
|
r = 0;
|
|
|
|
if (r < 0 && (force || fail || r != -EPERM)) {
|
|
goto fail;
|
|
}
|
|
|
|
if (r >= 0)
|
|
break;
|
|
|
|
assert(!fail);
|
|
assert(!force);
|
|
assert(notify >= 0);
|
|
|
|
for (;;) {
|
|
union inotify_event_buffer buffer;
|
|
struct inotify_event *e;
|
|
ssize_t l;
|
|
|
|
if (timeout != USEC_INFINITY) {
|
|
usec_t n;
|
|
|
|
n = now(CLOCK_MONOTONIC);
|
|
if (ts + timeout < n) {
|
|
r = -ETIMEDOUT;
|
|
goto fail;
|
|
}
|
|
|
|
r = fd_wait_for_event(fd, POLLIN, ts + timeout - n);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
if (r == 0) {
|
|
r = -ETIMEDOUT;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
l = read(notify, &buffer, sizeof(buffer));
|
|
if (l < 0) {
|
|
if (errno == EINTR || errno == EAGAIN)
|
|
continue;
|
|
|
|
r = -errno;
|
|
goto fail;
|
|
}
|
|
|
|
FOREACH_INOTIFY_EVENT(e, buffer, l) {
|
|
if (e->wd != wd || !(e->mask & IN_CLOSE)) {
|
|
r = -EIO;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* We close the tty fd here since if the old session
|
|
* ended our handle will be dead. It's important that
|
|
* we do this after sleeping, so that we don't enter
|
|
* an endless loop. */
|
|
fd = safe_close(fd);
|
|
}
|
|
|
|
safe_close(notify);
|
|
|
|
r = reset_terminal_fd(fd, true);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to reset terminal: %m");
|
|
|
|
return fd;
|
|
|
|
fail:
|
|
safe_close(fd);
|
|
safe_close(notify);
|
|
|
|
return r;
|
|
}
|
|
|
|
int release_terminal(void) {
|
|
static const struct sigaction sa_new = {
|
|
.sa_handler = SIG_IGN,
|
|
.sa_flags = SA_RESTART,
|
|
};
|
|
|
|
_cleanup_close_ int fd = -1;
|
|
struct sigaction sa_old;
|
|
int r = 0;
|
|
|
|
fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return -errno;
|
|
|
|
/* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
|
|
* by our own TIOCNOTTY */
|
|
assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
|
|
|
|
if (ioctl(fd, TIOCNOTTY) < 0)
|
|
r = -errno;
|
|
|
|
assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
|
|
|
|
return r;
|
|
}
|
|
|
|
int terminal_vhangup_fd(int fd) {
|
|
assert(fd >= 0);
|
|
|
|
if (ioctl(fd, TIOCVHANGUP) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int terminal_vhangup(const char *name) {
|
|
_cleanup_close_ int fd;
|
|
|
|
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
return terminal_vhangup_fd(fd);
|
|
}
|
|
|
|
int vt_disallocate(const char *name) {
|
|
int fd, r;
|
|
unsigned u;
|
|
|
|
/* Deallocate the VT if possible. If not possible
|
|
* (i.e. because it is the active one), at least clear it
|
|
* entirely (including the scrollback buffer) */
|
|
|
|
if (!startswith(name, "/dev/"))
|
|
return -EINVAL;
|
|
|
|
if (!tty_is_vc(name)) {
|
|
/* So this is not a VT. I guess we cannot deallocate
|
|
* it then. But let's at least clear the screen */
|
|
|
|
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
loop_write(fd,
|
|
"\033[r" /* clear scrolling region */
|
|
"\033[H" /* move home */
|
|
"\033[2J", /* clear screen */
|
|
10, false);
|
|
safe_close(fd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (!startswith(name, "/dev/tty"))
|
|
return -EINVAL;
|
|
|
|
r = safe_atou(name+8, &u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (u <= 0)
|
|
return -EINVAL;
|
|
|
|
/* Try to deallocate */
|
|
fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
r = ioctl(fd, VT_DISALLOCATE, u);
|
|
safe_close(fd);
|
|
|
|
if (r >= 0)
|
|
return 0;
|
|
|
|
if (errno != EBUSY)
|
|
return -errno;
|
|
|
|
/* Couldn't deallocate, so let's clear it fully with
|
|
* scrollback */
|
|
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
loop_write(fd,
|
|
"\033[r" /* clear scrolling region */
|
|
"\033[H" /* move home */
|
|
"\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */
|
|
10, false);
|
|
safe_close(fd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void warn_melody(void) {
|
|
_cleanup_close_ int fd = -1;
|
|
|
|
fd = open("/dev/console", O_WRONLY|O_CLOEXEC|O_NOCTTY);
|
|
if (fd < 0)
|
|
return;
|
|
|
|
/* Yeah, this is synchronous. Kinda sucks. But well... */
|
|
|
|
ioctl(fd, KIOCSOUND, (int)(1193180/440));
|
|
usleep(125*USEC_PER_MSEC);
|
|
|
|
ioctl(fd, KIOCSOUND, (int)(1193180/220));
|
|
usleep(125*USEC_PER_MSEC);
|
|
|
|
ioctl(fd, KIOCSOUND, (int)(1193180/220));
|
|
usleep(125*USEC_PER_MSEC);
|
|
|
|
ioctl(fd, KIOCSOUND, 0);
|
|
}
|
|
|
|
int make_console_stdio(void) {
|
|
int fd, r;
|
|
|
|
/* Make /dev/console the controlling terminal and stdin/stdout/stderr */
|
|
|
|
fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY);
|
|
if (fd < 0)
|
|
return log_error_errno(fd, "Failed to acquire terminal: %m");
|
|
|
|
r = make_stdio(fd);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to duplicate terminal fd: %m");
|
|
|
|
return 0;
|
|
}
|
|
|
|
int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) {
|
|
static const char status_indent[] = " "; /* "[" STATUS "] " */
|
|
_cleanup_free_ char *s = NULL;
|
|
_cleanup_close_ int fd = -1;
|
|
struct iovec iovec[6] = {};
|
|
int n = 0;
|
|
static bool prev_ephemeral;
|
|
|
|
assert(format);
|
|
|
|
/* This is independent of logging, as status messages are
|
|
* optional and go exclusively to the console. */
|
|
|
|
if (vasprintf(&s, format, ap) < 0)
|
|
return log_oom();
|
|
|
|
fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
if (ellipse) {
|
|
char *e;
|
|
size_t emax, sl;
|
|
int c;
|
|
|
|
c = fd_columns(fd);
|
|
if (c <= 0)
|
|
c = 80;
|
|
|
|
sl = status ? sizeof(status_indent)-1 : 0;
|
|
|
|
emax = c - sl - 1;
|
|
if (emax < 3)
|
|
emax = 3;
|
|
|
|
e = ellipsize(s, emax, 50);
|
|
if (e) {
|
|
free(s);
|
|
s = e;
|
|
}
|
|
}
|
|
|
|
if (prev_ephemeral)
|
|
IOVEC_SET_STRING(iovec[n++], "\r" ANSI_ERASE_TO_END_OF_LINE);
|
|
prev_ephemeral = ephemeral;
|
|
|
|
if (status) {
|
|
if (!isempty(status)) {
|
|
IOVEC_SET_STRING(iovec[n++], "[");
|
|
IOVEC_SET_STRING(iovec[n++], status);
|
|
IOVEC_SET_STRING(iovec[n++], "] ");
|
|
} else
|
|
IOVEC_SET_STRING(iovec[n++], status_indent);
|
|
}
|
|
|
|
IOVEC_SET_STRING(iovec[n++], s);
|
|
if (!ephemeral)
|
|
IOVEC_SET_STRING(iovec[n++], "\n");
|
|
|
|
if (writev(fd, iovec, n) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) {
|
|
va_list ap;
|
|
int r;
|
|
|
|
assert(format);
|
|
|
|
va_start(ap, format);
|
|
r = status_vprintf(status, ellipse, ephemeral, format, ap);
|
|
va_end(ap);
|
|
|
|
return r;
|
|
}
|
|
|
|
bool tty_is_vc(const char *tty) {
|
|
assert(tty);
|
|
|
|
return vtnr_from_tty(tty) >= 0;
|
|
}
|
|
|
|
bool tty_is_console(const char *tty) {
|
|
assert(tty);
|
|
|
|
if (startswith(tty, "/dev/"))
|
|
tty += 5;
|
|
|
|
return streq(tty, "console");
|
|
}
|
|
|
|
int vtnr_from_tty(const char *tty) {
|
|
int i, r;
|
|
|
|
assert(tty);
|
|
|
|
if (startswith(tty, "/dev/"))
|
|
tty += 5;
|
|
|
|
if (!startswith(tty, "tty") )
|
|
return -EINVAL;
|
|
|
|
if (tty[3] < '0' || tty[3] > '9')
|
|
return -EINVAL;
|
|
|
|
r = safe_atoi(tty+3, &i);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (i < 0 || i > 63)
|
|
return -EINVAL;
|
|
|
|
return i;
|
|
}
|
|
|
|
char *resolve_dev_console(char **active) {
|
|
char *tty;
|
|
|
|
/* Resolve where /dev/console is pointing to, if /sys is actually ours
|
|
* (i.e. not read-only-mounted which is a sign for container setups) */
|
|
|
|
if (path_is_read_only_fs("/sys") > 0)
|
|
return NULL;
|
|
|
|
if (read_one_line_file("/sys/class/tty/console/active", active) < 0)
|
|
return NULL;
|
|
|
|
/* If multiple log outputs are configured the last one is what
|
|
* /dev/console points to */
|
|
tty = strrchr(*active, ' ');
|
|
if (tty)
|
|
tty++;
|
|
else
|
|
tty = *active;
|
|
|
|
if (streq(tty, "tty0")) {
|
|
char *tmp;
|
|
|
|
/* Get the active VC (e.g. tty1) */
|
|
if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) {
|
|
free(*active);
|
|
tty = *active = tmp;
|
|
}
|
|
}
|
|
|
|
return tty;
|
|
}
|
|
|
|
bool tty_is_vc_resolve(const char *tty) {
|
|
_cleanup_free_ char *active = NULL;
|
|
|
|
assert(tty);
|
|
|
|
if (startswith(tty, "/dev/"))
|
|
tty += 5;
|
|
|
|
if (streq(tty, "console")) {
|
|
tty = resolve_dev_console(&active);
|
|
if (!tty)
|
|
return false;
|
|
}
|
|
|
|
return tty_is_vc(tty);
|
|
}
|
|
|
|
const char *default_term_for_tty(const char *tty) {
|
|
assert(tty);
|
|
|
|
return tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt220";
|
|
}
|
|
|
|
int fd_columns(int fd) {
|
|
struct winsize ws = {};
|
|
|
|
if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
|
|
return -errno;
|
|
|
|
if (ws.ws_col <= 0)
|
|
return -EIO;
|
|
|
|
return ws.ws_col;
|
|
}
|
|
|
|
unsigned columns(void) {
|
|
const char *e;
|
|
int c;
|
|
|
|
if (_likely_(cached_columns > 0))
|
|
return cached_columns;
|
|
|
|
c = 0;
|
|
e = getenv("COLUMNS");
|
|
if (e)
|
|
(void) safe_atoi(e, &c);
|
|
|
|
if (c <= 0)
|
|
c = fd_columns(STDOUT_FILENO);
|
|
|
|
if (c <= 0)
|
|
c = 80;
|
|
|
|
cached_columns = c;
|
|
return cached_columns;
|
|
}
|
|
|
|
int fd_lines(int fd) {
|
|
struct winsize ws = {};
|
|
|
|
if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
|
|
return -errno;
|
|
|
|
if (ws.ws_row <= 0)
|
|
return -EIO;
|
|
|
|
return ws.ws_row;
|
|
}
|
|
|
|
unsigned lines(void) {
|
|
const char *e;
|
|
int l;
|
|
|
|
if (_likely_(cached_lines > 0))
|
|
return cached_lines;
|
|
|
|
l = 0;
|
|
e = getenv("LINES");
|
|
if (e)
|
|
(void) safe_atoi(e, &l);
|
|
|
|
if (l <= 0)
|
|
l = fd_lines(STDOUT_FILENO);
|
|
|
|
if (l <= 0)
|
|
l = 24;
|
|
|
|
cached_lines = l;
|
|
return cached_lines;
|
|
}
|
|
|
|
/* intended to be used as a SIGWINCH sighandler */
|
|
void columns_lines_cache_reset(int signum) {
|
|
cached_columns = 0;
|
|
cached_lines = 0;
|
|
}
|
|
|
|
bool on_tty(void) {
|
|
static int cached_on_tty = -1;
|
|
|
|
if (_unlikely_(cached_on_tty < 0))
|
|
cached_on_tty = isatty(STDOUT_FILENO) > 0;
|
|
|
|
return cached_on_tty;
|
|
}
|
|
|
|
int make_stdio(int fd) {
|
|
int r, s, t;
|
|
|
|
assert(fd >= 0);
|
|
|
|
r = dup2(fd, STDIN_FILENO);
|
|
s = dup2(fd, STDOUT_FILENO);
|
|
t = dup2(fd, STDERR_FILENO);
|
|
|
|
if (fd >= 3)
|
|
safe_close(fd);
|
|
|
|
if (r < 0 || s < 0 || t < 0)
|
|
return -errno;
|
|
|
|
/* Explicitly unset O_CLOEXEC, since if fd was < 3, then
|
|
* dup2() was a NOP and the bit hence possibly set. */
|
|
fd_cloexec(STDIN_FILENO, false);
|
|
fd_cloexec(STDOUT_FILENO, false);
|
|
fd_cloexec(STDERR_FILENO, false);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int make_null_stdio(void) {
|
|
int null_fd;
|
|
|
|
null_fd = open("/dev/null", O_RDWR|O_NOCTTY);
|
|
if (null_fd < 0)
|
|
return -errno;
|
|
|
|
return make_stdio(null_fd);
|
|
}
|
|
|
|
int getttyname_malloc(int fd, char **ret) {
|
|
size_t l = 100;
|
|
int r;
|
|
|
|
assert(fd >= 0);
|
|
assert(ret);
|
|
|
|
for (;;) {
|
|
char path[l];
|
|
|
|
r = ttyname_r(fd, path, sizeof(path));
|
|
if (r == 0) {
|
|
const char *p;
|
|
char *c;
|
|
|
|
p = startswith(path, "/dev/");
|
|
c = strdup(p ?: path);
|
|
if (!c)
|
|
return -ENOMEM;
|
|
|
|
*ret = c;
|
|
return 0;
|
|
}
|
|
|
|
if (r != ERANGE)
|
|
return -r;
|
|
|
|
l *= 2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int getttyname_harder(int fd, char **r) {
|
|
int k;
|
|
char *s = NULL;
|
|
|
|
k = getttyname_malloc(fd, &s);
|
|
if (k < 0)
|
|
return k;
|
|
|
|
if (streq(s, "tty")) {
|
|
free(s);
|
|
return get_ctty(0, NULL, r);
|
|
}
|
|
|
|
*r = s;
|
|
return 0;
|
|
}
|
|
|
|
int get_ctty_devnr(pid_t pid, dev_t *d) {
|
|
int r;
|
|
_cleanup_free_ char *line = NULL;
|
|
const char *p;
|
|
unsigned long ttynr;
|
|
|
|
assert(pid >= 0);
|
|
|
|
p = procfs_file_alloca(pid, "stat");
|
|
r = read_one_line_file(p, &line);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
p = strrchr(line, ')');
|
|
if (!p)
|
|
return -EIO;
|
|
|
|
p++;
|
|
|
|
if (sscanf(p, " "
|
|
"%*c " /* state */
|
|
"%*d " /* ppid */
|
|
"%*d " /* pgrp */
|
|
"%*d " /* session */
|
|
"%lu ", /* ttynr */
|
|
&ttynr) != 1)
|
|
return -EIO;
|
|
|
|
if (major(ttynr) == 0 && minor(ttynr) == 0)
|
|
return -ENXIO;
|
|
|
|
if (d)
|
|
*d = (dev_t) ttynr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
|
|
char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL;
|
|
_cleanup_free_ char *s = NULL;
|
|
const char *p;
|
|
dev_t devnr;
|
|
int k;
|
|
|
|
assert(r);
|
|
|
|
k = get_ctty_devnr(pid, &devnr);
|
|
if (k < 0)
|
|
return k;
|
|
|
|
sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr));
|
|
|
|
k = readlink_malloc(fn, &s);
|
|
if (k < 0) {
|
|
|
|
if (k != -ENOENT)
|
|
return k;
|
|
|
|
/* This is an ugly hack */
|
|
if (major(devnr) == 136) {
|
|
if (asprintf(&b, "pts/%u", minor(devnr)) < 0)
|
|
return -ENOMEM;
|
|
} else {
|
|
/* Probably something like the ptys which have no
|
|
* symlink in /dev/char. Let's return something
|
|
* vaguely useful. */
|
|
|
|
b = strdup(fn + 5);
|
|
if (!b)
|
|
return -ENOMEM;
|
|
}
|
|
} else {
|
|
if (startswith(s, "/dev/"))
|
|
p = s + 5;
|
|
else if (startswith(s, "../"))
|
|
p = s + 3;
|
|
else
|
|
p = s;
|
|
|
|
b = strdup(p);
|
|
if (!b)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*r = b;
|
|
if (_devnr)
|
|
*_devnr = devnr;
|
|
|
|
return 0;
|
|
}
|