79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/* ****************************************************************************
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* comlist/builtin/linux.c -- find out Linux serial devices.
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* Copyright (C) 2016-2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
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*
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* This file is part of libcasio.
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* libcasio 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 3.0 of the License,
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* or (at your option) any later version.
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*
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* libcasio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libcasio; if not, see <http://www.gnu.org/licenses/>.
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* ************************************************************************* */
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#include "../../internals.h"
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#ifdef __linux__
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# include <sys/stat.h>
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# include <dirent.h>
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# include <fcntl.h>
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# include <unistd.h>
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# include <errno.h>
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/**
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* casio_comlist_linux:
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* List serial devices under Linux.
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*
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* Links in the /dev/serial/by-id/ should resolve to relative paths, but
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* I also managed absolute paths, in case.
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*
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* @arg callback the callback.
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* @arg cookie the cookie.
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* @return the error.
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*/
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int CASIO_EXPORT casio_comlist_linux(casio_list_com_t *callback, void *cookie)
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{
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char path[PATH_MAX + 1], devname[PATH_MAX + 1], *f, *p;
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DIR *d; struct dirent *dr; struct stat st;
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ssize_t rl;
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/* open the thing */
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strcpy(path, "/dev/serial/by-id/");
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d = opendir(path); if (!d) return (casio_error_unknown);
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/* prepare */
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f = strchr(path, 0);
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/* read the entries */
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while ((dr = readdir(d))) {
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/* check type */
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strcpy(f, dr->d_name);
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if (lstat(path, &st) || (st.st_mode & S_IFMT) != S_IFLNK)
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continue;
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/* get destination path and send it */
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rl = readlink(path, devname, PATH_MAX + 1);
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if (rl < 0) continue;
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devname[rl] = 0;
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if (devname[0] == '/')
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(*callback)(cookie, devname);
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else {
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strcpy(f, devname);
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p = realpath(path, devname);
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if (!p) continue;
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(*callback)(cookie, p);
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}
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}
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/* close the dir and we're done listing */
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closedir(d);
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return (0);
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}
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# endif /* __linux__ */
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