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sysfs(2) [osf1 man page]

sysfs(2)							System Calls Manual							  sysfs(2)

sysfs - gather information about file system types SYNOPSIS
#include <sys/fstyp.h> #include <sys/fsid.h> int sysfs( int opcode, const char *fsname ); int sysfs( int opcode, int fs_index, char *buf ); int sysfs( int opcode ); PARAMETERS
Points to the buffer where the file system type is placed. The buffer size must be equal to FSTYPSZ as defined in <sys/fstyp.h>. Speci- fies an index file system type. Specifies a null-terminated file system type identifier. Specifies an operation used to obtain informa- tion about the file system types. DESCRIPTION
This function gathers information about configured file system types. Depending on the operation you want to perform, the opcode parameter may be specified by itself, or in combination with the other available parameters as shown in the SYNOPSIS section. The opcode parameter may be one of the following: Must be specified with the fsname parameter. This operation changes the specified null- terminated file system type identifier to a file system type identifier. Must be specified with the parameters fs_index and buf. This operation changes the specified file system type index to a null-terminated type file system type identifier and writes it into the buffer specified. Specified by itself, this operation requests the total number of file system types configured in the system to be returned. RETURN VALUES
The following values are returned on success: If GETFSIND is specified, the file system type index is returned. If GETFSTYP is specified, a value of zero (0) is returned. If GETNFSTYP is specified, the number of file system types configured in the system is returned. On error, a value of -1 is returned and errno is set. ERRORS
One or more of the following may be returned on failure: Indicates an invalid file system identifier is pointed to fsname, the specified fs_index is either zero (0) or invalid, or the specified opcode is invalid. Indicates that either fsname or buf is pointing to an invalid user address. Indicates that a file system was installed with a name that exceeds the buffer size of FSTYPSZ. sysfs(2)

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SYSFS(2)                                                     Linux Programmer's Manual                                                    SYSFS(2)

sysfs - get filesystem type information SYNOPSIS
int sysfs(int option, const char *fsname); int sysfs(int option, unsigned int fs_index, char *buf); int sysfs(int option); DESCRIPTION
Note: if you are looking for information about the sysfs filesystem that is normally mounted at /sys, see sysfs(5). The (obsolete) sysfs() system call returns information about the filesystem types currently present in the kernel. The specific form of the sysfs() call and the information returned depends on the option in effect: 1 Translate the filesystem identifier string fsname into a filesystem type index. 2 Translate the filesystem type index fs_index into a null-terminated filesystem identifier string. This string will be written to the buffer pointed to by buf. Make sure that buf has enough space to accept the string. 3 Return the total number of filesystem types currently present in the kernel. The numbering of the filesystem type indexes begins with zero. RETURN VALUE
On success, sysfs() returns the filesystem index for option 1, zero for option 2, and the number of currently configured filesystems for option 3. On error, -1 is returned, and errno is set appropriately. ERRORS
EFAULT Either fsname or buf is outside your accessible address space. EINVAL fsname is not a valid filesystem type identifier; fs_index is out-of-bounds; option is invalid. CONFORMING TO
This System-V derived system call is obsolete; don't use it. On systems with /proc, the same information can be obtained via /proc/filesystems; use that interface instead. BUGS
There is no libc or glibc support. There is no way to guess how large buf should be. COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at Linux 2017-09-15 SYSFS(2)
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