X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fbasic%2Fterminal-util.c;h=9e7e3b618931bdce13f08c4558acaf95d4ec20ac;hb=166f4e4fb53a82900ff9ae080e0ff37d35d4dacd;hp=103643614bd9042ad5c8ea22929e29c7c7db5362;hpb=1cfc78c91965df340cdde100ad6cb3ed50b28927;p=elogind.git
diff --git a/src/basic/terminal-util.c b/src/basic/terminal-util.c
index 103643614..9e7e3b618 100644
--- a/src/basic/terminal-util.c
+++ b/src/basic/terminal-util.c
@@ -17,26 +17,34 @@
along with systemd; If not, see .
***/
+#include
+#include
+#include
+#include
+#include
+#include
+#include
#include
-#include
#include
+#include
#include
-#include
-#include
-#include
#include
-#include
-#include
-#include
-#include
-#include
+#include
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "io-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "socket-util.h"
+#include "stat-util.h"
+#include "string-util.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 +52,11 @@ 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
@@ -66,6 +74,7 @@ int chvt(int vt) {
return 0;
}
+#if 0 /// UNNEEDED by elogind
int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
struct termios old_termios, new_termios;
char c, line[LINE_MAX];
@@ -139,14 +148,14 @@ int ask_char(char *ret, const char *replies, const char *text, ...) {
bool need_nl = true;
if (on_tty())
- fputs(ANSI_HIGHLIGHT_ON, stdout);
+ fputs(ANSI_HIGHLIGHT, stdout);
va_start(ap, text);
vprintf(text, ap);
va_end(ap);
if (on_tty())
- fputs(ANSI_HIGHLIGHT_OFF, stdout);
+ fputs(ANSI_NORMAL, stdout);
fflush(stdout);
@@ -174,8 +183,6 @@ int ask_char(char *ret, const char *replies, const char *text, ...) {
}
}
-/// UNNEEDED by elogind
-#if 0
int ask_string(char **ret, const char *text, ...) {
assert(ret);
assert(text);
@@ -185,14 +192,14 @@ int ask_string(char **ret, const char *text, ...) {
va_list ap;
if (on_tty())
- fputs(ANSI_HIGHLIGHT_ON, stdout);
+ fputs(ANSI_HIGHLIGHT, stdout);
va_start(ap, text);
vprintf(text, ap);
va_end(ap);
if (on_tty())
- fputs(ANSI_HIGHLIGHT_OFF, stdout);
+ fputs(ANSI_NORMAL, stdout);
fflush(stdout);
@@ -218,7 +225,6 @@ int ask_string(char **ret, const char *text, ...) {
}
}
}
-#endif // 0
int reset_terminal_fd(int fd, bool switch_to_text) {
struct termios termios;
@@ -233,14 +239,14 @@ 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;
@@ -279,7 +285,7 @@ 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;
}
@@ -287,12 +293,17 @@ 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;
return reset_terminal_fd(fd, true);
}
+#endif // 0
int open_terminal(const char *name, int mode) {
int fd, r;
@@ -307,7 +318,8 @@ 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);
@@ -339,6 +351,7 @@ int open_terminal(const char *name, int mode) {
return fd;
}
+#if 0 /// UNNEEDED by elogind
int acquire_terminal(
const char *name,
bool fail,
@@ -410,15 +423,14 @@ 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;
@@ -479,10 +491,6 @@ 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:
@@ -491,7 +499,9 @@ fail:
return r;
}
+#endif // 0
+#if 0 /// UNNEEDED by elogind
int release_terminal(void) {
static const struct sigaction sa_new = {
.sa_handler = SIG_IGN,
@@ -502,7 +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;
@@ -530,7 +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;
@@ -538,8 +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
@@ -561,8 +572,6 @@ int vt_disallocate(const char *name) {
"\033[H" /* move home */
"\033[2J", /* clear screen */
10, false);
- safe_close(fd);
-
return 0;
}
@@ -577,12 +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;
@@ -601,32 +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;
@@ -636,90 +622,17 @@ 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");
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;
-}
+#endif // 0
bool tty_is_vc(const char *tty) {
assert(tty);
@@ -760,6 +673,7 @@ int vtnr_from_tty(const char *tty) {
return i;
}
+#if 0 /// UNNEEDED by elogind
char *resolve_dev_console(char **active) {
char *tty;
@@ -815,6 +729,7 @@ const char *default_term_for_tty(const char *tty) {
return tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt220";
}
+#endif // 0
int fd_columns(int fd) {
struct winsize ws = {};
@@ -885,8 +800,7 @@ unsigned lines(void) {
}
/* intended to be used as a SIGWINCH sighandler */
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
void columns_lines_cache_reset(int signum) {
cached_columns = 0;
cached_lines = 0;
@@ -936,6 +850,7 @@ int make_null_stdio(void) {
return make_stdio(null_fd);
}
+#if 0 /// UNNEEDED by elogind
int getttyname_malloc(int fd, char **ret) {
size_t l = 100;
int r;
@@ -985,6 +900,7 @@ int getttyname_harder(int fd, char **r) {
*r = s;
return 0;
}
+#endif // 0
int get_ctty_devnr(pid_t pid, dev_t *d) {
int r;
@@ -1076,3 +992,152 @@ int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
return 0;
}
+
+#if 0 /// UNNEEDED by elogind
+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);
+}
+#endif // 0