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/*****************************************************************************\
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* write_labelled_message.c - write a message with an optional label
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*****************************************************************************
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* Copyright (C) 2009 Lawrence Livermore National Security.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Christopher J. Morrone <morrone2@llnl.gov> and
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* David Bremer <dbremer@llnl.gov>
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* CODE-OCEC-09-009. All rights reserved.
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* This file is part of SLURM, a resource management program.
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* For details, see <https://computing.llnl.gov/linux/slurm/>.
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* Please also read the included file: DISCLAIMER.
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* SLURM is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* In addition, as a special exception, the copyright holders give permission
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* to link the code of portions of this program with the OpenSSL library under
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* certain conditions as described in each individual source file, and
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* distribute linked combinations including the two. You must obey the GNU
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* General Public License in all respects for all of the code used other than
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* OpenSSL. If you modify file(s) with this exception, you may extend this
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* exception to your version of the file(s), but you are not obligated to do
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* so. If you do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source files in
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* the program, then also delete it here.
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* SLURM is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* You should have received a copy of the GNU General Public License along
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* with SLURM; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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\*****************************************************************************/
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#include "src/common/write_labelled_message.h"
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#include "slurm/slurm_errno.h"
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#include "src/common/log.h"
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static int _write_label(int fd, int taskid, int label_width);
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static int _write_line(int fd, void *buf, int len);
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static int _write_newline(int fd);
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int write_labelled_message(int fd, void *buf, int len, int taskid,
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bool label, int label_width)
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while (remaining > 0) {
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start = buf + written;
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end = memchr(start, '\n', remaining);
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if (_write_label(fd, taskid, label_width)
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if (end == NULL) { /* no newline found */
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rc = _write_line(fd, start, remaining);
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if (_write_newline(fd) != SLURM_SUCCESS)
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line_len = (int)(end - start) + 1;
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rc = _write_line(fd, start, line_len);
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static int _write_label(int fd, int taskid, int label_width)
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int left = label_width + 2;
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snprintf(buf, 16, "%0*d: ", label_width, taskid);
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if ((n = write(fd, ptr, left)) < 0) {
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if ((errno == EAGAIN) || (errno == EWOULDBLOCK)) {
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debug3(" got EAGAIN in _write_label");
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error("In _write_label: %m");
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return SLURM_SUCCESS;
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static int _write_newline(int fd)
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debug2("Called _write_newline");
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if ((n = write(fd, "\n", 1)) < 0) {
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|| errno == EWOULDBLOCK) {
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error("In _write_newline: %m");
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return SLURM_SUCCESS;
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* Blocks until write is complete, regardless of the file
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* descriptor being in non-blocking mode.
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static int _write_line(int fd, void *buf, int len)
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debug2("Called _write_line");
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if ((n = write(fd, ptr, left)) < 0) {
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if ((errno == EAGAIN) || (errno == EWOULDBLOCK)) {
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debug3(" got EAGAIN in _write_line");