1sysfs(2) System Calls Manual sysfs(2)
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6 sysfs - get filesystem type information
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9 [[deprecated]] int sysfs(int option, const char *fsname);
10 [[deprecated]] int sysfs(int option, unsigned int fs_index, char *buf);
11 [[deprecated]] int sysfs(int option);
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14 Note: if you are looking for information about the sysfs filesystem
15 that is normally mounted at /sys, see sysfs(5).
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17 The (obsolete) sysfs() system call returns information about the
18 filesystem types currently present in the kernel. The specific form of
19 the sysfs() call and the information returned depends on the option in
20 effect:
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22 1 Translate the filesystem identifier string fsname into a filesystem
23 type index.
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25 2 Translate the filesystem type index fs_index into a null-terminated
26 filesystem identifier string. This string will be written to the
27 buffer pointed to by buf. Make sure that buf has enough space to
28 accept the string.
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30 3 Return the total number of filesystem types currently present in the
31 kernel.
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33 The numbering of the filesystem type indexes begins with zero.
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36 On success, sysfs() returns the filesystem index for option 1, zero for
37 option 2, and the number of currently configured filesystems for option
38 3. On error, -1 is returned, and errno is set to indicate the error.
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41 EFAULT Either fsname or buf is outside your accessible address space.
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43 EINVAL fsname is not a valid filesystem type identifier; fs_index is
44 out-of-bounds; option is invalid.
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47 None.
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50 SVr4.
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52 This System-V derived system call is obsolete; don't use it. On sys‐
53 tems with /proc, the same information can be obtained via /proc; use
54 that interface instead.
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57 There is no libc or glibc support. There is no way to guess how large
58 buf should be.
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61 proc(5), sysfs(5)
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65Linux man-pages 6.04 2023-03-30 sysfs(2)