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util-linux/include/sysfs.h

127 lines
4.2 KiB

/*
* Copyright (C) 2011 Karel Zak <kzak@redhat.com>
*/
#ifndef UTIL_LINUX_SYSFS_H
#define UTIL_LINUX_SYSFS_H
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <inttypes.h>
#include <dirent.h>
struct sysfs_cxt {
dev_t devno;
int dir_fd; /* /sys/block/<name> */
char *dir_path;
struct sysfs_cxt *parent;
unsigned int scsi_host,
scsi_channel,
scsi_target,
scsi_lun;
unsigned int has_hctl : 1;
};
#define UL_SYSFSCXT_EMPTY { 0, -1, NULL, NULL, 0, 0, 0, 0, 0 }
extern char *sysfs_devno_attribute_path(dev_t devno, char *buf,
size_t bufsiz, const char *attr);
extern int sysfs_devno_has_attribute(dev_t devno, const char *attr);
extern char *sysfs_devno_path(dev_t devno, char *buf, size_t bufsiz);
extern char *sysfs_devno_to_devpath(dev_t devno, char *buf, size_t bufsiz);
extern dev_t sysfs_devname_to_devno(const char *name, const char *parent);
extern int sysfs_init(struct sysfs_cxt *cxt, dev_t devno, struct sysfs_cxt *parent)
__attribute__ ((warn_unused_result));
extern void sysfs_deinit(struct sysfs_cxt *cxt);
extern DIR *sysfs_opendir(struct sysfs_cxt *cxt, const char *attr);
extern int sysfs_stat(struct sysfs_cxt *cxt, const char *attr, struct stat *st);
extern ssize_t sysfs_readlink(struct sysfs_cxt *cxt, const char *attr,
char *buf, size_t bufsiz);
extern int sysfs_has_attribute(struct sysfs_cxt *cxt, const char *attr);
extern int sysfs_scanf(struct sysfs_cxt *cxt, const char *attr,
const char *fmt, ...)
__attribute__ ((format (scanf, 3, 4)));
extern int sysfs_read_s64(struct sysfs_cxt *cxt, const char *attr, int64_t *res);
extern int sysfs_read_u64(struct sysfs_cxt *cxt, const char *attr, uint64_t *res);
extern int sysfs_read_int(struct sysfs_cxt *cxt, const char *attr, int *res);
extern int sysfs_write_string(struct sysfs_cxt *cxt, const char *attr, const char *str);
extern int sysfs_write_u64(struct sysfs_cxt *cxt, const char *attr, uint64_t num);
extern char *sysfs_get_devname(struct sysfs_cxt *cxt, char *buf, size_t bufsiz);
extern char *sysfs_strdup(struct sysfs_cxt *cxt, const char *attr);
extern int sysfs_count_dirents(struct sysfs_cxt *cxt, const char *attr);
extern int sysfs_count_partitions(struct sysfs_cxt *cxt, const char *devname);
extern dev_t sysfs_partno_to_devno(struct sysfs_cxt *cxt, int partno);
extern char *sysfs_get_slave(struct sysfs_cxt *cxt);
extern char *sysfs_get_devchain(struct sysfs_cxt *cxt, char *buf, size_t bufsz);
extern int sysfs_next_subsystem(struct sysfs_cxt *cxt, char *devchain, char **subsys);
extern int sysfs_is_hotpluggable(struct sysfs_cxt *cxt);
extern int sysfs_is_partition_dirent(DIR *dir, struct dirent *d,
const char *parent_name);
extern int sysfs_devno_to_wholedisk(dev_t dev, char *diskname,
size_t len, dev_t *diskdevno);
extern int sysfs_devno_is_lvm_private(dev_t devno);
extern int sysfs_devno_is_wholedisk(dev_t devno);
extern int sysfs_scsi_get_hctl(struct sysfs_cxt *cxt, int *h,
int *c, int *t, int *l);
extern char *sysfs_scsi_host_strdup_attribute(struct sysfs_cxt *cxt,
const char *type, const char *attr);
extern int sysfs_scsi_host_is(struct sysfs_cxt *cxt, const char *type);
extern int sysfs_scsi_has_attribute(struct sysfs_cxt *cxt, const char *attr);
extern int sysfs_scsi_path_contains(struct sysfs_cxt *cxt, const char *pattern);
/**
* sysfs_devname_sys_to_dev:
* @name: devname to be converted in place
*
* Linux kernel linux/drivers/base/core.c: device_get_devnode()
* defines a replacement of '!' in the /sys device name by '/' in the
* /dev device name. This helper replaces all occurrences of '!' in
* @name by '/' to convert from /sys to /dev.
*/
static inline void sysfs_devname_sys_to_dev(char *name)
{
char *c;
if (name)
while ((c = strchr(name, '!')))
c[0] = '/';
}
/**
* sysfs_devname_dev_to_sys:
* @name: devname to be converted in place
*
* See sysfs_devname_sys_to_dev().
*/
static inline void sysfs_devname_dev_to_sys(char *name)
{
char *c;
if (name)
while ((c = strchr(name, '/')))
c[0] = '!';
}
#endif /* UTIL_LINUX_SYSFS_H */