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-rw-r--r--src/basic/terminal-util.c466
1 files changed, 309 insertions, 157 deletions
diff --git a/src/basic/terminal-util.c b/src/basic/terminal-util.c
index 042b88f222..eafdea9eb3 100644
--- a/src/basic/terminal-util.c
+++ b/src/basic/terminal-util.c
@@ -17,26 +17,44 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/inotify.h>
+#include <sys/socket.h>
+#include <sys/sysmacros.h>
+#include <sys/time.h>
+#include <linux/kd.h>
+#include <linux/tiocl.h>
+#include <linux/vt.h>
+#include <poll.h>
+#include <signal.h>
#include <sys/ioctl.h>
#include <sys/types.h>
-#include <sys/stat.h>
#include <termios.h>
#include <unistd.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <time.h>
-#include <assert.h>
-#include <poll.h>
-#include <linux/vt.h>
-#include <linux/tiocl.h>
-#include <linux/kd.h>
+#include "alloc-util.h"
+#include "env-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "io-util.h"
+#include "log.h"
+#include "macro.h"
+#include "parse-util.h"
+#include "process-util.h"
+#include "socket-util.h"
+#include "stat-util.h"
+#include "string-util.h"
+#include "strv.h"
#include "terminal-util.h"
#include "time-util.h"
-#include "process-util.h"
#include "util.h"
-#include "fileio.h"
-#include "path-util.h"
static volatile unsigned cached_columns = 0;
static volatile unsigned cached_lines = 0;
@@ -44,11 +62,11 @@ static volatile unsigned cached_lines = 0;
int chvt(int vt) {
_cleanup_close_ int fd;
- fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
+ fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0)
return -errno;
- if (vt < 0) {
+ if (vt <= 0) {
int tiocl[2] = {
TIOCL_GETKMSGREDIRECT,
0
@@ -112,7 +130,7 @@ int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
errno = 0;
if (!fgets(line, sizeof(line), f))
- return errno ? -errno : -EIO;
+ return errno > 0 ? -errno : -EIO;
truncate_nl(line);
@@ -138,15 +156,15 @@ int ask_char(char *ret, const char *replies, const char *text, ...) {
char c;
bool need_nl = true;
- if (on_tty())
- fputs(ANSI_HIGHLIGHT_ON, stdout);
+ if (colors_enabled())
+ fputs(ANSI_HIGHLIGHT, stdout);
va_start(ap, text);
vprintf(text, ap);
va_end(ap);
- if (on_tty())
- fputs(ANSI_HIGHLIGHT_OFF, stdout);
+ if (colors_enabled())
+ fputs(ANSI_NORMAL, stdout);
fflush(stdout);
@@ -182,21 +200,21 @@ int ask_string(char **ret, const char *text, ...) {
char line[LINE_MAX];
va_list ap;
- if (on_tty())
- fputs(ANSI_HIGHLIGHT_ON, stdout);
+ if (colors_enabled())
+ fputs(ANSI_HIGHLIGHT, stdout);
va_start(ap, text);
vprintf(text, ap);
va_end(ap);
- if (on_tty())
- fputs(ANSI_HIGHLIGHT_OFF, stdout);
+ if (colors_enabled())
+ fputs(ANSI_NORMAL, stdout);
fflush(stdout);
errno = 0;
if (!fgets(line, sizeof(line), stdin))
- return errno ? -errno : -EIO;
+ return errno > 0 ? -errno : -EIO;
if (!endswith(line, "\n"))
putchar('\n');
@@ -230,14 +248,14 @@ int reset_terminal_fd(int fd, bool switch_to_text) {
* interfere with that. */
/* Disable exclusive mode, just in case */
- ioctl(fd, TIOCNXCL);
+ (void) ioctl(fd, TIOCNXCL);
/* Switch to text mode */
if (switch_to_text)
- ioctl(fd, KDSETMODE, KD_TEXT);
+ (void) ioctl(fd, KDSETMODE, KD_TEXT);
/* Enable console unicode mode */
- ioctl(fd, KDSKBMODE, K_UNICODE);
+ (void) ioctl(fd, KDSKBMODE, K_UNICODE);
if (tcgetattr(fd, &termios) < 0) {
r = -errno;
@@ -276,7 +294,7 @@ int reset_terminal_fd(int fd, bool switch_to_text) {
finish:
/* Just in case, flush all crap out */
- tcflush(fd, TCIOFLUSH);
+ (void) tcflush(fd, TCIOFLUSH);
return r;
}
@@ -284,7 +302,11 @@ finish:
int reset_terminal(const char *name) {
_cleanup_close_ int fd = -1;
- fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
+ /* We open the terminal with O_NONBLOCK here, to ensure we
+ * don't block on carrier if this is a terminal with carrier
+ * configured. */
+
+ fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0)
return fd;
@@ -304,7 +326,8 @@ int open_terminal(const char *name, int mode) {
* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
*/
- assert(!(mode & O_CREAT));
+ if (mode & O_CREAT)
+ return -EINVAL;
for (;;) {
fd = open(name, mode, 0);
@@ -323,12 +346,7 @@ int open_terminal(const char *name, int mode) {
}
r = isatty(fd);
- if (r < 0) {
- safe_close(fd);
- return -errno;
- }
-
- if (!r) {
+ if (r == 0) {
safe_close(fd);
return -ENOTTY;
}
@@ -407,15 +425,14 @@ int acquire_terminal(
assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
- /* Sometimes it makes sense to ignore TIOCSCTTY
+ /* 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)) {
+ if (r < 0 && (force || fail || r != -EPERM))
goto fail;
- }
if (r >= 0)
break;
@@ -476,10 +493,6 @@ int acquire_terminal(
safe_close(notify);
- r = reset_terminal_fd(fd, true);
- if (r < 0)
- log_warning_errno(r, "Failed to reset terminal: %m");
-
return fd;
fail:
@@ -499,7 +512,7 @@ int release_terminal(void) {
struct sigaction sa_old;
int r = 0;
- fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC);
+ fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0)
return -errno;
@@ -527,7 +540,7 @@ int terminal_vhangup_fd(int fd) {
int terminal_vhangup(const char *name) {
_cleanup_close_ int fd;
- fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
+ fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0)
return fd;
@@ -535,8 +548,9 @@ int terminal_vhangup(const char *name) {
}
int vt_disallocate(const char *name) {
- int fd, r;
+ _cleanup_close_ int fd = -1;
unsigned u;
+ int r;
/* Deallocate the VT if possible. If not possible
* (i.e. because it is the active one), at least clear it
@@ -558,8 +572,6 @@ int vt_disallocate(const char *name) {
"\033[H" /* move home */
"\033[2J", /* clear screen */
10, false);
- safe_close(fd);
-
return 0;
}
@@ -574,12 +586,12 @@ int vt_disallocate(const char *name) {
return -EINVAL;
/* Try to deallocate */
- fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
+ fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0)
return fd;
r = ioctl(fd, VT_DISALLOCATE, u);
- safe_close(fd);
+ fd = safe_close(fd);
if (r >= 0)
return 0;
@@ -598,32 +610,9 @@ int vt_disallocate(const char *name) {
"\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;
@@ -633,6 +622,10 @@ int make_console_stdio(void) {
if (fd < 0)
return log_error_errno(fd, "Failed to acquire terminal: %m");
+ r = reset_terminal_fd(fd, true);
+ if (r < 0)
+ log_warning_errno(r, "Failed to reset terminal, ignoring: %m");
+
r = make_stdio(fd);
if (r < 0)
return log_error_errno(r, "Failed to duplicate terminal fd: %m");
@@ -640,84 +633,6 @@ int make_console_stdio(void) {
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);
@@ -790,6 +705,64 @@ char *resolve_dev_console(char **active) {
return tty;
}
+int get_kernel_consoles(char ***consoles) {
+ _cleanup_strv_free_ char **con = NULL;
+ _cleanup_free_ char *line = NULL;
+ const char *active;
+ int r;
+
+ assert(consoles);
+
+ r = read_one_line_file("/sys/class/tty/console/active", &line);
+ if (r < 0)
+ return r;
+
+ active = line;
+ for (;;) {
+ _cleanup_free_ char *tty = NULL;
+ char *path;
+
+ r = extract_first_word(&active, &tty, NULL, 0);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ if (streq(tty, "tty0")) {
+ tty = mfree(tty);
+ r = read_one_line_file("/sys/class/tty/tty0/active", &tty);
+ if (r < 0)
+ return r;
+ }
+
+ path = strappend("/dev/", tty);
+ if (!path)
+ return -ENOMEM;
+
+ if (access(path, F_OK) < 0) {
+ log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path);
+ free(path);
+ continue;
+ }
+
+ r = strv_consume(&con, path);
+ if (r < 0)
+ return r;
+ }
+
+ if (strv_isempty(con)) {
+ log_debug("No devices found for system console");
+
+ r = strv_extend(&con, "/dev/console");
+ if (r < 0)
+ return r;
+ }
+
+ *consoles = con;
+ con = NULL;
+ return 0;
+}
+
bool tty_is_vc_resolve(const char *tty) {
_cleanup_free_ char *active = NULL;
@@ -808,9 +781,7 @@ bool tty_is_vc_resolve(const char *tty) {
}
const char *default_term_for_tty(const char *tty) {
- assert(tty);
-
- return tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt220";
+ return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220";
}
int fd_columns(int fd) {
@@ -913,9 +884,7 @@ int make_stdio(int fd) {
/* 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);
+ stdio_unset_cloexec();
return 0;
}
@@ -1070,3 +1039,186 @@ int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
return 0;
}
+
+int ptsname_malloc(int fd, char **ret) {
+ size_t l = 100;
+
+ assert(fd >= 0);
+ assert(ret);
+
+ for (;;) {
+ char *c;
+
+ c = new(char, l);
+ if (!c)
+ return -ENOMEM;
+
+ if (ptsname_r(fd, c, l) == 0) {
+ *ret = c;
+ return 0;
+ }
+ if (errno != ERANGE) {
+ free(c);
+ return -errno;
+ }
+
+ free(c);
+ l *= 2;
+ }
+}
+
+int ptsname_namespace(int pty, char **ret) {
+ int no = -1, r;
+
+ /* Like ptsname(), but doesn't assume that the path is
+ * accessible in the local namespace. */
+
+ r = ioctl(pty, TIOCGPTN, &no);
+ if (r < 0)
+ return -errno;
+
+ if (no < 0)
+ return -EIO;
+
+ if (asprintf(ret, "/dev/pts/%i", no) < 0)
+ return -ENOMEM;
+
+ return 0;
+}
+
+int openpt_in_namespace(pid_t pid, int flags) {
+ _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1;
+ _cleanup_close_pair_ int pair[2] = { -1, -1 };
+ siginfo_t si;
+ pid_t child;
+ int r;
+
+ assert(pid > 0);
+
+ r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd);
+ if (r < 0)
+ return r;
+
+ if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
+ return -errno;
+
+ child = fork();
+ if (child < 0)
+ return -errno;
+
+ if (child == 0) {
+ int master;
+
+ pair[0] = safe_close(pair[0]);
+
+ r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd);
+ if (r < 0)
+ _exit(EXIT_FAILURE);
+
+ master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC);
+ if (master < 0)
+ _exit(EXIT_FAILURE);
+
+ if (unlockpt(master) < 0)
+ _exit(EXIT_FAILURE);
+
+ if (send_one_fd(pair[1], master, 0) < 0)
+ _exit(EXIT_FAILURE);
+
+ _exit(EXIT_SUCCESS);
+ }
+
+ pair[1] = safe_close(pair[1]);
+
+ r = wait_for_terminate(child, &si);
+ if (r < 0)
+ return r;
+ if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)
+ return -EIO;
+
+ return receive_one_fd(pair[0], 0);
+}
+
+int open_terminal_in_namespace(pid_t pid, const char *name, int mode) {
+ _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1;
+ _cleanup_close_pair_ int pair[2] = { -1, -1 };
+ siginfo_t si;
+ pid_t child;
+ int r;
+
+ r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd);
+ if (r < 0)
+ return r;
+
+ if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
+ return -errno;
+
+ child = fork();
+ if (child < 0)
+ return -errno;
+
+ if (child == 0) {
+ int master;
+
+ pair[0] = safe_close(pair[0]);
+
+ r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd);
+ if (r < 0)
+ _exit(EXIT_FAILURE);
+
+ master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC);
+ if (master < 0)
+ _exit(EXIT_FAILURE);
+
+ if (send_one_fd(pair[1], master, 0) < 0)
+ _exit(EXIT_FAILURE);
+
+ _exit(EXIT_SUCCESS);
+ }
+
+ pair[1] = safe_close(pair[1]);
+
+ r = wait_for_terminate(child, &si);
+ if (r < 0)
+ return r;
+ if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)
+ return -EIO;
+
+ return receive_one_fd(pair[0], 0);
+}
+
+static bool getenv_terminal_is_dumb(void) {
+ const char *e;
+
+ e = getenv("TERM");
+ if (!e)
+ return true;
+
+ return streq(e, "dumb");
+}
+
+bool terminal_is_dumb(void) {
+ if (!on_tty())
+ return true;
+
+ return getenv_terminal_is_dumb();
+}
+
+bool colors_enabled(void) {
+ static int enabled = -1;
+
+ if (_unlikely_(enabled < 0)) {
+ int val;
+
+ val = getenv_bool("SYSTEMD_COLORS");
+ if (val >= 0)
+ enabled = val;
+ else if (getpid() == 1)
+ /* PID1 outputs to the console without holding it open all the time */
+ enabled = !getenv_terminal_is_dumb();
+ else
+ enabled = !terminal_is_dumb();
+ }
+
+ return enabled;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-08-15 02:34:01 +0000