1UTIME(P) POSIX Programmer's Manual UTIME(P)
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6 utime - set file access and modification times
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9 #include <utime.h>
10 int utime(const char *path, const struct utimbuf *times);
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15 The utime() function shall set the access and modification times of the
16 file named by the path argument.
17 If times is a null pointer, the access and modification times of the
19 file shall be set to the current time. The effective user ID of the
20 process shall match the owner of the file, or the process has write
21 permission to the file or has appropriate privileges, to use utime() in
22 this manner.
23 If times is not a null pointer, times shall be interpreted as a pointer
25 to a utimbuf structure and the access and modification times shall be
26 set to the values contained in the designated structure. Only a process
27 with the effective user ID equal to the user ID of the file or a
28 process with appropriate privileges may use utime() this way.
29 The utimbuf structure is defined in the <utime.h> header. The times in
31 the structure utimbuf are measured in seconds since the Epoch.
32 Upon successful completion, utime() shall mark the time of the last
34 file status change, st_ctime, to be updated; see <sys/stat.h>.
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37 Upon successful completion, 0 shall be returned. Otherwise, -1 shall be
38 returned and errno shall be set to indicate the error, and the file
39 times shall not be affected.
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42 The utime() function shall fail if:
43 EACCES Search permission is denied by a component of the path prefix;
45 or the times argument is a null pointer and the effective user
46 ID of the process does not match the owner of the file, the
47 process does not have write permission for the file, and the
48 process does not have appropriate privileges.
49 ELOOP A loop exists in symbolic links encountered during resolution of
51 the path argument.
52 ENAMETOOLONG
54 The length of the path argument exceeds {PATH_MAX} or a pathname
55 component is longer than {NAME_MAX}.
56 ENOENT A component of path does not name an existing file or path is an
58 empty string.
59 ENOTDIR
61 A component of the path prefix is not a directory.
62 EPERM The times argument is not a null pointer and the calling
64 process' effective user ID does not match the owner of the file
65 and the calling process does not have the appropriate privi‐
66 leges.
67 EROFS The file system containing the file is read-only.
69 The utime() function may fail if:
72 ELOOP More than {SYMLOOP_MAX} symbolic links were encountered during
74 resolution of the path argument.
75 ENAMETOOLONG
77 As a result of encountering a symbolic link in resolution of the
78 path argument, the length of the substituted pathname string
79 exceeded {PATH_MAX}.
80 The following sections are informative.
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85 None.
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88 None.
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91 The actime structure member must be present so that an application may
92 set it, even though an implementation may ignore it and not change the
93 access time on the file. If an application intends to leave one of the
94 times of a file unchanged while changing the other, it should use
95 stat() to retrieve the file's st_atime and st_mtime parameters, set
96 actime and modtime in the buffer, and change one of them before making
97 the utime() call.
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100 None.
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103 The Base Definitions volume of IEEE Std 1003.1-2001, <sys/stat.h>,
104 <utime.h>
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107 Portions of this text are reprinted and reproduced in electronic form
108 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
109 -- Portable Operating System Interface (POSIX), The Open Group Base
110 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
111 Electrical and Electronics Engineers, Inc and The Open Group. In the
112 event of any discrepancy between this version and the original IEEE and
113 The Open Group Standard, the original IEEE and The Open Group Standard
114 is the referee document. The original Standard can be obtained online
115 at http://www.opengroup.org/unix/online.html .
116IEEE/The Open Group 2003 UTIME(P)