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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
commit97d5c458cfa039d857301e1ca7d5af3beb37131d (patch)
treeb460cd850d0537eb71806ba30358840377b27688 /static/v10/man2/stat.2
parentb89dc2331a50c63f8b33272a5c4c61ab98abdaa3 (diff)
build: Better Build System
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-.TH STAT 2
-.CT 2 file_inq_creat
-.SH NAME
-stat, lstat, fstat \(mi get file status
-.SH SYNOPSIS
-.nf
-.B #include <sys/types.h>
-.B #include <sys/stat.h>
-.PP
-.B int stat(name, buf)
-.B char *name;
-.B struct stat *buf;
-.PP
-.B int lstat(name, buf)
-.B char *name;
-.B struct stat *buf;
-.PP
-.B int fstat(fildes, buf)
-.B struct stat *buf;
-.fi
-.SH DESCRIPTION
-.I Stat
-puts detailed information about the file
-.I name
-in a structure whose address is
-.IR buf .
-.I Lstat
-does the same except when
-.I name
-is a symbolic
-link (see
-.IR link (2)),
-in which case it
-supplies information about the link itself.
-.I Fstat
-does the same for an open file
-known by a file descriptor.
-.PP
-It is unnecessary to have any
-permissions at all with respect to
-.IR name ,
-but all directories
-leading to the file must be searchable.
-.nf
-.ta \w'\fLnnnnnnnn\fP'u +\w'\fLunsigned short st_mode; \fP'u
-\fLstruct stat
-{
- \fLdev_t st_dev;\fR major/minor device numbers for the inode
- \fLino_t st_ino;\fP inode number
- \fLunsigned short st_mode;\fP file mode encoded as below
- \fLshort st_nlink;\fP number of links (not symbolic links)
- \fLshort st_uid;\fP uid of owner
- \fLshort st_gid;\fP gid of owner
- \fLdev_t st_rdev;\fP if special, the major/minor device numbers
- \fLoff_t st_size;\fP size in bytes
- \fLtime_t st_atime;\fP time file was last read or created
- \fLtime_t st_mtime;\fP time file was last written or created
- \fLtime_t st_ctime;\fP time file or inode was last written or created
-\fL};\fP
-.fi
-.PP
-For reasons of efficiency,
-.B st_atime
-is not set when a directory
-is searched, although this might be more logical.
-.PP
-The bits in
-.B st_mode
-are defined by
-.nf
-.ft L
-.ta 12n 22n
-.ft P
-\fLS_IFMT 0170000\fP file type
-\fLS_IFDIR 0040000\fP directory
-\fLS_IFCHR 0020000\fP special character device
-\fLS_IFBLK 0060000\fP special block device
-\fLS_IFREG 0100000\fP regular file
-\fLS_IFLNK 0120000\fP symbolic link
-\fLS_ISUID 0004000\fP set userid on execution
-\fLS_ISGID 0002000\fP set groupid on execution
-\fLS_ICCTYP 0007000\fP type of concurrency control
-\fLS_ISYNC 0001000\fP 1 writer and n readers (synchronized access)
-\fLS_IEXCL 0003000\fP 1 writer or n readers (exclusive access)
-\fLS_IAPPEND 0005000\fP append-only file
-\fLS_IBLIND 0007000\fP blind directory
-\fL 0000400\fP read by owner
-\fL 0000200\fP write by owner
-\fL 0000100\fP execute (search on directory) by owner
-\fL 0000070\fP read, write, execute (search) by group
-\fL 0000007\fP read, write, execute (search) by others
-.fi
-.PP
-.B S_IFMT
-and
-.B S_ICCTYP
-are field masks; the other constants encode modes.
-Codes contained in the
-.B S_IFMT
-field are mutually exclusive.
-Codes containing bit 01000 are incompatible with other
-codes contained in the
-.B S_ICCTYP
-field.
-.PP
-.I Fstat,
-which reads the inode,
-and
-.IR write (2)
-can be performed on the same file descriptor only if
-the security labels of file and process reach the same value
-or if the process has capability
-.BR T_NOCHK .
-.SH "SEE ALSO"
-.IR chmod (1),
-.IR ls (1),
-.IR stat (1),
-.IR chmod (2),
-.IR filsys (5)
-.SH DIAGNOSTICS
-.BR EACCES ,
-.BR EBADF ,
-.BR EFAULT ,
-.BR EIO ,
-.BR ELAB ,
-.BR ELOOP ,
-.BR ENOENT ,
-.BR ENOTDIR