stat(2XNX) (XENIX System Compatibility) stat(2XNX)
NAME
stat, lstat, fstat - (XENIX) get file status
SYNOPSIS
cc [flag . . . ] flag . . . -lx
#include <sys/types.h>
#include <sys/stat.h>
int stat(const char *path, struct stat *buf);
int lstat(const char *path, struct stat *buf);
int fstat(int fildes, struct stat *buf);
DESCRIPTION
path points to a path name naming a file. Read, write, or
execute permission of the named file is not required, but all
directories listed in the path name leading to the file must
be searchable. stat obtains information about the named file.
lstat obtains file attributes similar to stat, except when the
named file is a symbolic link; in that case lstat returns
information about the link, while stat returns information
about the file the link references.
fstat obtains information about an open file known by the file
descriptor fildes, obtained from a successful open, creat,
dup, fcntl, or pipe system call.
buf is a pointer to a stat structure into which information is
placed concerning the file.
The contents of the structure pointed to by buf include the
following members:
mode_t st_mode; /* File mode [see mknod(2)] */
ino_t st_ino; /* Inode number */
dev_t st_dev; /* ID of device containing */
/* a directory entry for this file */
dev_t st_rdev; /* ID of device */
/* This entry is defined only for */
/* character special files */,
/* XENIX special named files or block
/* special files */
nlink_t st_nlink; /* Number of links */
uid_t st_uid; /* User ID of the file's owner */
gid_t st_gid; /* Group ID of the file's group */
off_t st_size; /* File size in bytes */
time_t st_atime; /* Time of last access */
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stat(2XNX) (XENIX System Compatibility) stat(2XNX)
time_t st_mtime; /* Time of last data modification */
time_t st_ctime; /* Time of last file status change */
/* Times measured in seconds since */
/* 00:00:00 GMT, Jan. 1, 1970 */
st_mode The mode of the file as described in mknod(2).
st_ino This field uniquely identifies the file in a given
file system. The pair st_ino and st_dev uniquely
identifies regular files.
st_dev This field uniquely identifies the file system that
contains the file. Its value may be used as input
to the ustat system call to determine more
information about this file system. No other
meaning is associated with this value.
st_rdev This field should be used only by administrative
commands. It is valid only for block special files
or character special files or XENIX special named
files. The st_rdev field for block special and
character special files only has meaning on the
system where the file was configured.
If the file is a XENIX special named file, it
contains the type code [see stat(4XNX) for the XENIX
semaphore and shared data type code values S_INSEM
and S_INSHD].
st_nlink This field should be used only by administrative
commands.
st_uid The user ID of the file's owner.
st_gid The group ID of the file's group.
st_size For regular files, this is the address of the end of
the file. For pipes or FIFOs, this is the count of
the data currently in the file. For block special
character special, or XENIX special named files,
this is not defined.
st_atime Time when file data was last accessed. Changed by
the following system calls: creat, mknod, pipe,
utime, read, creatsem, opensem, sigsem, waitsem,
sdget and sdfree.
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stat(2XNX) (XENIX System Compatibility) stat(2XNX)
st_mtime Time when data was last modified. Changed by the
following system calls: creat, mknod, pipe, utime,
write.
st_ctime Time when file status was last changed. Changed by
the following system calls: chmod, chown, creat,
link, mknod, pipe, unlink, utime, write, creatsem,
sdget and sdfree.
stat and lstat fail if one or more of the following are true:
EACCES Search permission is denied for a component of the
path prefix.
EBADF fildes is not a valid open file descriptor.
EFAULT buf or path points to an invalid address.
EINTR A signal was caught during the stat system call.
ELOOP Too many symbolic links were encountered in
translating path.
EMULTIHOP Components of path require hopping to multiple
remote machines.
ENAMETOOLONG
The length of the path argument exceeds {PATH_MAX},
or the length of a path component exceeds {NAME_MAX}
while (_POSIX_NO_TRUNC) is in effect.
ENOENT The named file does not exist or is the null
pathname.
ENOTDIR A component of the path prefix is not a directory.
ENOLINK path points to a remote machine and the link to that
machine is no longer active.
EOVERFLOW A component is too large to store in the structure
pointed to by buf.
fstat fails if one or more of the following are true:
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stat(2XNX) (XENIX System Compatibility) stat(2XNX)
ENOLINK fildes points to a remote machine and the link to
that machine is no longer active.
EOVERFLOW A component is too large to store in the structure
pointed to by buf.
REFERENCES
chmod(2), chown(2), creat(2), link(2), mknod(2), pipe(2),
read(2), stat(5), time(2), unlink(2), utime(2), write(2)
Return Values
Upon successful completion a value of 0 is returned.
Otherwise, a value of -1 is returned and errno is set to
indicate the error.
Copyright 1994 Novell, Inc. Page 4