ustat - Online Linux Manual PageSection : 2
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEustat − get filesystem statistics

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LIBRARYStandard C library (libc, −lc)

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SYNOPSIS#include <sys/types.h> #include <unistd.h> /* libc[45] */ #include <ustat.h> /* glibc2 */[[deprecated]] int ustat(dev_t dev, struct ustat *ubuf);

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DESCRIPTIONustat() returns information about a mounted filesystem. dev is a device number identifying a device containing a mounted filesystem. ubuf is a pointer to a ustat structure that contains the following members: daddr_t f_tfree; /* Total free blocks */ ino_t f_tinode; /* Number of free inodes */ char f_fname[6]; /* Filsys name */ char f_fpack[6]; /* Filsys pack name */The last two fields, f_fname and f_fpack, are not implemented and will always be filled with null bytes ('\0').

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RETURN VALUEOn success, zero is returned and the ustat structure pointed to by ubuf will be filled in. On error, −1 is returned, and errno is set to indicate the error.

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ERRORSEFAULT  ubuf points outside of your accessible address space. EINVAL  dev does not refer to a device containing a mounted filesystem. ENOSYS  The mounted filesystem referenced by dev does not support this operation, or any version of Linux before Linux 1.3.16.

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VERSIONSSince glibc 2.28, glibc no longer provides a wrapper for this system call.

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STANDARDSSVr4.

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NOTESustat() is deprecated and has been provided only for compatibility. All new programs should use statfs(2) instead.

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HP-UX notesThe HP-UX version of the ustat structure has an additional field, f_blksize, that is unknown elsewhere. HP-UX warns: For some filesystems, the number of free inodes does not change. Such filesystems will return −1 in the field f_tinode. For some filesystems, inodes are dynamically allocated. Such filesystems will return the current number of free inodes.

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SEE ALSOstat(2), statfs(2) 0

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