utime(2)
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utime System Call
Set file access and modification times.
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SYNTAX
#include <sys/types.h>
include <sys/time.h>
int utime (path, times)
char * path;
struct utimbuf *times;
PARAMETERS
path Address of a pathname.
times NULL or address of an initialized structure giving
the access and modification times.
DESCRIPTION
<Path> points to a pathname naming a file, which must reside on a
file system device mounted read-write. If <path> refers to a
symbolic link, the target of the symbolic link is affected.
Utime sets the `time-last-accessed' and `time-last-modified'
attributes of the subject file. If <times> is NULL, `time-last-
accessed' and `time-last-modified' are set to the current time.
Otherwise, the `time-last-accessed' is set to <(*times).actime>
and `time-last-modified' is set to <(*times).modtime>.
If utime fails, the file is left unchanged. Otherwise, the
`time-last-changed' attribute of the subject file is set to the
current time.
ACCESS CONTROL
The calling process must have permission to resolve <path>.
If <times> is NULL, either the calling process must have write
permission to the subject file or the calling process's effective
user id must be equal to the user id of the subject file.
Otherwise, the calling process's effective user id must be
superuser or the user id of the subject file.
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utime(2)
RETURN VALUE
0 The file's access and modification times were
changed successfully.
-1 An error occurred. Errno is set to indicate the
error.
EXCEPTIONS
Errno may be set to one of the following error codes:
EACCES Permission to set the access and modification
times to the current time is denied to the calling
process.
EFAULT <Times> is not NULL and some part of the utimbuf
structure pointed to by <times> lies outside the
process's readable address space.
EPERM Permission to set the access and modification
times to an arbitrary value is denied to the
calling process.
EROFS The file system device containing the subject file
is mounted read-only.
ENOENT The file the pathname resolved to does not exist.
ENOENT A non-terminal component of the pathname does not
exist.
ENOTDIR A non-terminal component of the pathname was not a
directory or symbolic link.
ENAMETOOLONG The pathname exceeds the length limit for
pathnames.
ENAMETOOLONG A component of the pathname exceeds the length
limit for filenames.
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utime(2)
ENOMEM There are not enough system resources to resolve
the pathname or to expand a symbolic link.
ELOOP The number of symbolic links encountered during
pathname resolution exceeded MAXSYMLINKS. A
symbolic link cycle is suspected.
EPERM The pathname contains a character not in the
allowed character set.
SEE ALSO
The related manual sections: dg_mstat(2), lstat(2), stat(2),
ustat(2), utimes(2),
stat(5).
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