From 378c18e5f024ac5a8aef4cb40d7c9aa9633d144c Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 16:30:35 +0200 Subject: Adding upstream version 2.38.1. Signed-off-by: Daniel Baumann --- lib/plymouth-ctrl.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+) create mode 100644 lib/plymouth-ctrl.c (limited to 'lib/plymouth-ctrl.c') diff --git a/lib/plymouth-ctrl.c b/lib/plymouth-ctrl.c new file mode 100644 index 0000000..2d3deda --- /dev/null +++ b/lib/plymouth-ctrl.c @@ -0,0 +1,144 @@ +/* + * plymouth-ctrl.c Simply communications with plymouthd + * to avoid forked sub processes and/or + * missed plymouth send commands tool + * due a plymouthd replacement. + * + * Copyright (c) 2016 SUSE Linux GmbH, All rights reserved. + * Copyright (c) 2016 Werner Fink + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program (see the file COPYING); if not, write to the + * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, + * MA 02110-1301, USA. + * + * Author: Werner Fink + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "all-io.h" +#include "c.h" +#include "nls.h" +#include "plymouth-ctrl.h" + +static int can_read(int fd, const long timeout) +{ + struct pollfd fds = { + .fd = fd, + .events = POLLIN|POLLPRI, + .revents = 0, + }; + int ret; + + do { + ret = poll(&fds, 1, timeout); + } while ((ret < 0) && (errno == EINTR)); + + return (ret == 1) && (fds.revents & (POLLIN|POLLPRI)); +} + +static int open_un_socket_and_connect(void) +{ + /* The abstract UNIX socket of plymouth */ + struct sockaddr_un su = { + .sun_family = AF_UNIX, + .sun_path = PLYMOUTH_SOCKET_PATH, + }; + const int one = 1; + int fd, ret; + + fd = socket(PF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); + if (fd < 0) { + warnx(_("cannot open UNIX socket")); + goto err; + } + + ret = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); + if (ret < 0) { + warnx(_("cannot set option for UNIX socket")); + close(fd); + fd = -1; + goto err; + } + + /* Note, the abstract PLYMOUTH_SOCKET_PATH has a leading NULL byte */ + ret = connect(fd, (struct sockaddr *) &su, + offsetof(struct sockaddr_un, sun_path) + 1 + strlen(su.sun_path+1)); + if (ret < 0) { + if (errno != ECONNREFUSED) + warnx(_("cannot connect on UNIX socket")); + close(fd); + fd = -1; + goto err; + } +err: + return fd; +} + +int plymouth_command(int cmd, ...) +{ + uint8_t answer[2], command[2]; + struct sigaction sp, op; + int fdsock = -1, ret = 0; + + sigemptyset (&sp.sa_mask); + sp.sa_handler = SIG_IGN; + sp.sa_flags = SA_RESTART; + sigaction(SIGPIPE, &sp, &op); + + /* The plymouthd does read at least two bytes. */ + command[1] = '\0'; + switch (cmd) { + case MAGIC_PING: + fdsock = open_un_socket_and_connect(); + if (fdsock >= 0) { + command[0] = cmd; + write_all(fdsock, command, sizeof(command)); + } + break; + case MAGIC_QUIT: + fdsock = open_un_socket_and_connect(); + if (fdsock >= 0) { + command[0] = cmd; + write_all(fdsock, command, sizeof(command)); + } + break; + default: + warnx(_("the plymouth request %c is not implemented"), cmd); + case '?': + goto err; + } + + answer[0] = '\0'; + if (fdsock >= 0) { + if (can_read(fdsock, 1000)) + read_all(fdsock, (char *) &answer[0], sizeof(answer)); + close(fdsock); + } + sigaction(SIGPIPE, &op, NULL); + ret = (answer[0] == ANSWER_ACK) ? 1 : 0; +err: + return ret; +} + -- cgit v1.2.3