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