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 | man pages section 2: System Calls Oracle Solaris 11 Information Library |
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| man pages section 2: System Calls Oracle Solaris 11 Information Library |
- get file system information
#include <sys/types.h>#include <sys/statvfs.h>intstatvfs(const char *restrictpath,struct statvfs *restrictbuf);
intfstatvfs(intfildes,struct statvfs *buf);
Thestatvfs() function returns a “generic superblock” describing a file system; itcan be used to acquire information about mounted file systems. Thebuf argument is a pointer to a structure (described below) that isfilled by the function.
Thepath argument should name a file that resides on that filesystem. The file system type is known to the operating system. Read,write, or execute permission for the named file is not required, butall directories listed in the path name leading to the file mustbe searchable.
Thestatvfs structure pointed to bybuf includes the following members:
u_long f_bsize; /* preferred file system block size */u_long f_frsize; /* fundamental filesystem block (size if supported) */fsblkcnt_t f_blocks; /* total # of blocks on file system in units of f_frsize */fsblkcnt_t f_bfree; /* total # of free blocks */fsblkcnt_t f_bavail; /* # of free blocks avail to non-privileged user */fsfilcnt_t f_files; /* total # of file nodes (inodes) */fsfilcnt_t f_ffree; /* total # of free file nodes */fsfilcnt_t f_favail; /* # of inodes avail to non-privileged user*/u_long f_fsid; /* file system id (dev for now) */char f_basetype[FSTYPSZ]; /* target fs type name, null-terminated */u_long f_flag; /* bit mask of flags */u_long f_namemax; /* maximum file name length */char f_fstr[32]; /* file system specific string */u_long f_filler[16]; /* reserved for future expansion */
Thef_basetype member contains a null-terminated FSType name of the mounted target.
The following values can be returned in thef_flag field:
ST_RDONLY 0x01 /* read-only file system */ST_NOSUID 0x02 /* does not support setuid/setgid semantics */ST_NOTRUNC 0x04 /* does not truncate file names longer than NAME_MAX */
Thefstatvfs() function is similar tostatvfs(), except that the file namedbypath instatvfs() is instead identified by an open file descriptorfildes obtained from a successfulopen(2),creat(2),dup(2),fcntl(2), orpipe(2) functioncall.
Upon successful completion,0 is returned. Otherwise,-1 is returned anderrnois set to indicate the error.
Thestatvfs() andfstatvfs() functions will fail if:
One of the values to be returned cannot be represented correctly in the structure pointed to bybuf.
Thestatvfs() function will fail if:
Search permission is denied on a component of the path prefix.
Thepath orbuf argument points to an illegal address.
A signal was caught during the execution of thestatvfs() function.
An I/O error occurred while reading the file system.
Too many symbolic links were encountered in translatingpath.
The length of apath component exceedsNAME_MAX characters, or the length ofpath The exceedsPATH_MAX characters.
Either a component of the path prefix or the file referred to bypath does not exist.
Thepath argument points to a remote machine and the link to that machine is no longer active.
A component of the path prefix ofpath is not a directory.
Thefstatvfs() function will fail if:
Thefildes argument is not an open file descriptor.
Thebuf argument points to an illegal address.
A signal was caught during the execution of thefstatvfs() function.
An I/O error occurred while reading the file system.
Thestatvfs() andfstatvfs() functions have transitional interfaces for 64-bit file offsets. Seelf64(5).
Seeattributes(5) for descriptions of the following attributes:
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chmod(2),chown(2),creat(2),dup(2),fcntl(2),link(2),mknod(2),open(2),pipe(2),read(2),time(2),unlink(2),utime(2),write(2),attributes(5),lf64(5),standards(5)
The values returned forf_files,f_ffree, andf_favail may not be validfor NFS mounted file systems.
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