UTIME.2
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操作系统开发
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C/C++
- ." Copyright (c) 1980 Regents of the University of California.
- ." All rights reserved. The Berkeley software License Agreement
- ." specifies the terms and conditions for redistribution.
- ."
- ." @(#)utimes.2 6.4 (Berkeley) 8/26/85
- ."
- .TH UTIME 2 "August 26, 1985"
- .UC 4
- .SH NAME
- utime - set file times
- .SH SYNOPSIS
- .nf
- .ft B
- #include <sys/types.h>
- #include <utime.h>
- int utime(const char *fIfilefP, struct utimbuf *fItimesfP)
- .fi
- .SH DESCRIPTION
- The
- .B utime
- call
- uses the
- *(lqaccessed*(rq and *(lqupdated*(rq times
- from the utimbuf structure pointed to by
- .I times
- to set the corresponding recorded times for
- .I file.
- .PP
- Struct utimbuf is defined in <utime.h> as follows:
- .PP
- .RS
- .nf
- .ta +0.4i +0.8i +1.0i
- struct utimbuf {
- time_t actime; /* access time */
- time_t modtime; /* modification time */
- };
- .fi
- .RE
- .PP
- The caller must be the owner of the file or the super-user.
- The *(lqinode-changed*(rq time of the file is set to the current time.
- .SH "RETURN VALUE
- Upon successful completion, a value of 0 is returned.
- Otherwise, a value of -1 is returned and
- .B errno
- is set to indicate the error.
- .SH "ERRORS
- .B Utime
- will fail if one or more of the following are true:
- .TP 15
- [ENOTDIR]
- A component of the path prefix is not a directory.
- .TP 15
- [EINVAL]
- The pathname contains a character with the high-order bit set.
- .TP 15
- [ENAMETOOLONG]
- The path name exceeds PATH_MAX characters.
- .TP 15
- [ENOENT]
- The named file does not exist.
- .TP 15
- [ELOOP]
- Too many symbolic links were encountered in translating the pathname.
- (Minix-vmd)
- .TP 15
- [EPERM]
- The process is not super-user and not the owner of the file.
- .TP 15
- [EACCES]
- Search permission is denied for a component of the path prefix.
- .TP 15
- [EROFS]
- The file system containing the file is mounted read-only.
- .TP 15
- [EFAULT]
- .I File
- or fItimesfP points outside the process's allocated address space.
- .TP 15
- [EIO]
- An I/O error occurred while reading or writing the affected inode.
- .SH SEE ALSO
- .BR stat (2).