53e1b68390
This follows what the kernel is doing, c.f. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5fd54ace4721fc5ce2bb5aef6318fcf17f421460.
131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2014 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 "alloc-util.h"
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#include "fd-util.h"
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#include "io-util.h"
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#include "parse-util.h"
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#include "show-status.h"
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#include "string-util.h"
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#include "terminal-util.h"
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#include "util.h"
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int parse_show_status(const char *v, ShowStatus *ret) {
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int r;
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assert(v);
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assert(ret);
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if (streq(v, "auto")) {
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*ret = SHOW_STATUS_AUTO;
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return 0;
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}
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r = parse_boolean(v);
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if (r < 0)
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return r;
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*ret = r ? SHOW_STATUS_YES : SHOW_STATUS_NO;
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return 0;
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}
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int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) {
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static const char status_indent[] = " "; /* "[" STATUS "] " */
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_cleanup_free_ char *s = NULL;
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_cleanup_close_ int fd = -1;
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struct iovec iovec[6] = {};
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int n = 0;
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static bool prev_ephemeral;
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assert(format);
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/* This is independent of logging, as status messages are
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* optional and go exclusively to the console. */
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if (vasprintf(&s, format, ap) < 0)
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return log_oom();
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/* Before you ask: yes, on purpose we open/close the console for each status line we write individually. This
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* is a good strategy to avoid PID 1 getting killed by the kernel's SAK concept (it doesn't fix this entirely,
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* but minimizes the time window the kernel might end up killing PID 1 due to SAK). It also makes things easier
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* for us so that we don't have to recover from hangups and suchlike triggered on the console. */
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fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
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if (fd < 0)
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return fd;
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if (ellipse) {
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char *e;
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size_t emax, sl;
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int c;
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c = fd_columns(fd);
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if (c <= 0)
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c = 80;
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sl = status ? sizeof(status_indent)-1 : 0;
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emax = c - sl - 1;
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if (emax < 3)
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emax = 3;
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e = ellipsize(s, emax, 50);
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if (e) {
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free(s);
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s = e;
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}
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}
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if (prev_ephemeral)
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iovec[n++] = IOVEC_MAKE_STRING("\r" ANSI_ERASE_TO_END_OF_LINE);
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prev_ephemeral = ephemeral;
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if (status) {
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if (!isempty(status)) {
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iovec[n++] = IOVEC_MAKE_STRING("[");
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iovec[n++] = IOVEC_MAKE_STRING(status);
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iovec[n++] = IOVEC_MAKE_STRING("] ");
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} else
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iovec[n++] = IOVEC_MAKE_STRING(status_indent);
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}
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iovec[n++] = IOVEC_MAKE_STRING(s);
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if (!ephemeral)
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iovec[n++] = IOVEC_MAKE_STRING("\n");
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if (writev(fd, iovec, n) < 0)
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return -errno;
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return 0;
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}
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int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) {
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va_list ap;
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int r;
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assert(format);
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va_start(ap, format);
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r = status_vprintf(status, ellipse, ephemeral, format, ap);
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va_end(ap);
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return r;
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}
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