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72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/* -*- Mode: C ; c-basic-offset: 2 -*- */
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/*
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* LADI Session Handler (ladish)
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*
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* Copyright (C) 2010, 2011 Nedko Arnaudov <nedko@arnaudov.name>
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*
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**************************************************************************
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* This file contains alsapid helper functionality
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**************************************************************************
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*
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* LADI Session Handler is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* LADI Session Handler 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. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LADI Session Handler. If not, see <http://www.gnu.org/licenses/>
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* or write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "alsapid.h"
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#include <string.h> /* GNU basename() */
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#include <stdio.h>
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#include <stdlib.h> /* atoll */
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#include <unistd.h>
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#include <sys/types.h>
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void alsapid_compose_src_link(int alsa_client_id, char * buffer)
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{
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sprintf(buffer, "/tmp/alsapid-%lld-%d", (long long)getuid(), alsa_client_id);
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}
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void alsapid_compose_dst_link(char * buffer)
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{
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sprintf(buffer, "/proc/%lld", (long long)getpid());
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}
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bool alsapid_get_pid(int alsa_client_id, pid_t * pid_ptr)
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{
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char src[MAX_ALSAPID_PATH];
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char dst[MAX_ALSAPID_PATH + 1];
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ssize_t ret;
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pid_t pid;
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alsapid_compose_src_link(alsa_client_id, src);
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ret = readlink(src, dst, MAX_ALSAPID_PATH);
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if (ret == -1)
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{
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return false;
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}
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dst[ret] = 0;
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pid = (pid_t)atoll(basename(dst));
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if (pid <= 1)
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{
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return false;
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}
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*pid_ptr = pid;
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return true;
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}
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