[77f386]: src / __bw_lock_file__.cc  Maximize  Restore  History

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// Copyright (C) 2009 Olaf Till <olaf.till@uni-jena.de>
// 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 3 of the License, 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; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include <octave/oct.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
DEFUN_DLD (__bw_lock_file__, args, , "Open the file named in arg and put an advisory write lock on it.\n\
Internal function of parallel package, function may change.\n") {
octave_value retval;
int fd, ret;
struct flock fl;
while ((fd = open (args(0).char_matrix_value().row_as_string(0).c_str(),
O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR)) < 0 &&
errno == EINTR);
if (fd < 0) {
error ("lock_file: error opening file");
return retval;
}
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 0;
while ((ret = fcntl (fd, F_SETLKW, &fl)) < 0 && errno == EINTR);
if (ret < 0) {
error ("lock_file: error locking file");
return retval;
}
return octave_value (fd);
}

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