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Paweł
a22a5fae7c
Attribute substitution only looked at the device's own sysfs directory,
while the matching key ATTRS{} walks parents. Devices without an
attribute of their own, partitions in particular whose serial lives in
the parent disk, therefore substituted to an empty string.
85 lines
3.0 KiB
C
85 lines
3.0 KiB
C
/* sysfs attribute reader and parent-chain walker for keventd
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*
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* Copyright (c) 2025 Joachim Wiberg <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef KEVENTD_SYSFS_H_
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#define KEVENTD_SYSFS_H_
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#include <stddef.h>
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/*
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* Read the first line from an absolute path.
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* Returns 0 on success, -1 on failure.
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*/
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int sysfs_read_file(const char *path, char *buf, size_t len);
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/*
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* Read a sysfs attribute for the device at /sys{devpath}.
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* attr may be a relative path like "device/vendor" or "../serial".
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* Returns 0 on success, -1 if the attribute does not exist.
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*/
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int sysfs_read_attr(const char *devpath, const char *attr,
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char *buf, size_t len);
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/*
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* Read a sysfs attribute for the device at /sys{devpath}, falling back
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* to the parent chain, partitions have no "serial" of their own, it
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* lives in the parent disk's sysfs directory.
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* Returns 0 on success, -1 if no level of the chain has the attribute.
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*/
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int sysfs_read_attr_chain(const char *devpath, const char *attr,
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char *buf, size_t len);
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/*
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* Walk the sysfs device tree upward from devpath toward /sys/devices,
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* calling cb at each level. cb receives the absolute syspath and the
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* caller-supplied data pointer. Walk stops when cb returns 0 (found)
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* or the tree root is reached.
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* Returns 0 if cb returned 0, -1 if nothing matched.
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*/
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int sysfs_parent_walk(const char *devpath,
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int (*cb)(const char *syspath, void *data),
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void *data);
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/*
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* Read the subsystem name at syspath by following the "subsystem"
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* symlink and returning its basename.
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* Returns 0 on success, -1 if there is no subsystem link.
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*/
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int sysfs_read_subsystem(const char *syspath, char *buf, size_t len);
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/*
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* Read the driver name at syspath by following the "driver" symlink
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* and returning its basename.
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* Returns 0 on success, -1 if there is no driver link.
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*/
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int sysfs_read_driver(const char *syspath, char *buf, size_t len);
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#endif /* KEVENTD_SYSFS_H_ */
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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