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147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
/*
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* Copyright (c) 2004-2008 Voltaire Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <config.h>
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#include <endian.h>
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#include <inttypes.h>
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#include <string.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "sysfs.h"
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static int ret_code(void)
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{
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int e = errno;
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if (e > 0)
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return -e;
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return e;
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}
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int sys_read_string(const char *dir_name, const char *file_name, char *str, int max_len)
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{
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char path[256], *s;
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int fd, r;
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snprintf(path, sizeof(path), "%s/%s", dir_name, file_name);
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if ((fd = open(path, O_RDONLY)) < 0)
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return ret_code();
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if ((r = read(fd, (void *)str, max_len)) < 0) {
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int e = errno;
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close(fd);
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errno = e;
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return ret_code();
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}
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str[(r < max_len) ? r : max_len - 1] = 0;
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if ((s = strrchr(str, '\n')))
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*s = 0;
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close(fd);
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return 0;
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}
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int sys_read_guid(const char *dir_name, const char *file_name, __be64 *net_guid)
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{
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char buf[32], *str, *s;
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uint64_t guid;
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int r, i;
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if ((r = sys_read_string(dir_name, file_name, buf, sizeof(buf))) < 0)
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return r;
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guid = 0;
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for (s = buf, i = 0; i < 4; i++) {
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if (!(str = strsep(&s, ": \t\n")))
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return -EINVAL;
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guid = (guid << 16) | (strtoul(str, NULL, 16) & 0xffff);
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}
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*net_guid = htobe64(guid);
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return 0;
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}
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int sys_read_gid(const char *dir_name, const char *file_name,
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union umad_gid *gid)
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{
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char buf[64], *str, *s;
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__be16 *ugid = (__be16 *) gid;
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int r, i;
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if ((r = sys_read_string(dir_name, file_name, buf, sizeof(buf))) < 0)
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return r;
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for (s = buf, i = 0; i < 8; i++) {
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if (!(str = strsep(&s, ": \t\n")))
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return -EINVAL;
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ugid[i] = htobe16(strtoul(str, NULL, 16) & 0xffff);
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}
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return 0;
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}
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int sys_read_uint64(const char *dir_name, const char *file_name, uint64_t * u)
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{
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char buf[32];
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int r;
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if ((r = sys_read_string(dir_name, file_name, buf, sizeof(buf))) < 0)
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return r;
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*u = strtoull(buf, NULL, 0);
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return 0;
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}
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int sys_read_uint(const char *dir_name, const char *file_name, unsigned *u)
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{
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char buf[32];
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int r;
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if ((r = sys_read_string(dir_name, file_name, buf, sizeof(buf))) < 0)
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return r;
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*u = strtoul(buf, NULL, 0);
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return 0;
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}
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