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All Rights Reserved. .\" Copyright (c) 2009, Sun Microsystems, Inc. All Rights Reserved. .\" Copyright (c) 2014, Joyent, Inc. .\" .TH UTIMES 2 "Dec 20, 2014" .SH NAME utimes, futimesat \- set file access and modification times .SH SYNOPSIS .LP .nf #include \fBint\fR \fButimes\fR(\fBconst char *\fR\fIpath\fR, \fBconst struct timeval\fR \fItimes\fR[2]); .fi .LP .nf \fBint\fR \fBfutimesat\fR(\fBint\fR \fIfildes\fR, \fBconst char *\fR\fIpath\fR, \fBconst struct timeval\fR \fItimes\fR[2]); .fi .LP .nf #include \fBint\fR \fBfutimens\fR(\fBint\fR \fIfiledes\fR, \fBconst timespec_t\fR \fInstimes[2]\fR); \fBint\fR \fButimensat\fR(\fBint\fR \fIfiledes\fR, \fBconst char *\fR\fIpath\fR, \fBconst timespec_t\fR \fInstimes[2]\fR, \fBint\fR \fIflag\fR); .SH DESCRIPTION .LP The \fButimes()\fR function sets the access and modification times of the file pointed to by the \fIpath\fR argument to the value of the \fItimes\fR argument. It allows time specifications accurate to the microsecond. .sp .LP The \fBfutimesat()\fR function also sets access and modification times. See \fBfsattr\fR(5). If \fIpath\fR is a relative path name, however, \fBfutimesat()\fR resolves the path relative to the \fIfildes\fR argument rather than the current working directory. If \fIfildes\fR is set to \fBAT_FDCWD\fR, defined in <\fBfcntl.h\fR>, \fBfutimesat()\fR resolves the path relative to the current working directory. If \fIpath\fR is a null pointer, \fBfutimesat()\fR sets the access and modification times on the file referenced by \fIfildes\fR. The \fIfildes\fR argument is ignored even when \fBfutimesat()\fR is provided with an absolute path. .sp .LP The \fItimes\fR argument is an array of \fBtimeval\fR structures. The first array member represents the date and time of last access, and the second member represents the date and time of last modification. The times in the \fBtimeval\fR structure are measured in seconds and microseconds since the Epoch, although rounding toward the nearest second may occur. .sp .LP If the \fItimes\fR argument is a null pointer, the access and modification times of the file are set to the current time. The effective user \fBID\fR of the process must be the same as the owner of the file, or must have write access to the file or the {\fBPRIV_FILE_OWNER\fR} privilege to use this call in this manner. Upon completion, \fButimes()\fR will mark the time of the last file status change, \fBst_ctime\fR, for update. .sp .LP The \fBfutimens()\fR and \fButimensat()\fR functions also set access and modification times; however, instead of taking \fBstruct timeval\fR, they take \fBtimespec_t\fR which allows for nanosecond granularity. The \fBfutimens()\fR function sets the access and modification times on the file descriptor referenced by \fIfiledes\fR. .sp .LP The \fButimensat()\fR function determines the file to set the access and modification times in an similar way to \fBfutemsat()\fR. If the argument \fIpath\fR is an absolute path, then the argument \fIfiledes\fR is ignored; otherwise, \fIpath\fR is interpreted as a path relative to the directory specified by \fIfiledes\fR. If \fIfiledes\fR is set to \fBAT_FDCWD\fR, then \fIpath\fR is resolved relative to the current working directory. The behavior when encountering symbolic links may be controlled by the value of the \fIflag\fR argument. If the value of flag is the constant \fBAT_SYMLINK_NOFOLLOW\fR, then when a symbolic link is encountered while resolving a path, it will not be followed. Otherwise, the value of \fIflag\fR should be \fB0\fR. .SH RETURN VALUES .LP Upon successful completion, \fB0\fR is returned. Otherwise, \fB\(mi1\fR is returned, \fBerrno\fR is set to indicate the error, and the file times will not be affected. .SH ERRORS .LP The \fButimes()\fR, \fBfutimesat()\fR, \fBfutimens()\fR, and \fButimensat()\fR functions will fail if: .sp .ne 2 .na \fB\fBEACCES\fR\fR .ad .RS 16n Search permission is denied by a component of the path prefix; or the \fItimes\fR argument is a null pointer and the effective user \fBID\fR of the process does not match the owner of the file and write access is denied. .RE .sp .ne 2 .na \fB\fBEFAULT\fR\fR .ad .RS 16n The \fIpath\fR or \fItimes\fR argument points to an illegal address. For \fBfutimesat()\fR, \fIpath\fR might have the value \fINULL\fR if the \fIfildes\fR argument refers to a valid open file descriptor. .RE .sp .ne 2 .na \fB\fBEINTR\fR\fR .ad .RS 16n A signal was caught during the execution of the \fButimes()\fR, \fBfutimesat()\fR, \fBfutimens()\fR, or \fButimensat()\fR functions. .RE .sp .ne 2 .na \fB\fBEINVAL\fR\fR .ad .RS 16n The number of microseconds specified in one or both of the \fBtimeval\fR structures pointed to by \fItimes\fR was greater than or equal to 1,000,000 or less than 0. The number of nanoseconds specified in one or both of the \fBtimespec_t\fR structures pointed to by \fInstimes\fR was greater than or equal to 1,000,000,000 or less than 0. .RE .sp .ne 2 .na \fB\fBEIO\fR\fR .ad .RS 16n An I/O error occurred while reading from or writing to the file system. .RE .sp .ne 2 .na \fB\fBELOOP\fR\fR .ad .RS 16n Too many symbolic links were encountered in resolving \fIpath\fR. .RE .sp .ne 2 .na \fB\fBENAMETOOLONG\fR\fR .ad .RS 16n The length of the \fIpath\fR argument exceeds {\fIPATH_MAX\fR} or a pathname component is longer than {\fINAME_MAX\fR}. .RE .sp .ne 2 .na \fB\fBENOLINK\fR\fR .ad .RS 16n The \fIpath\fR argument points to a remote machine and the link to that machine is no longer active. .RE .sp .ne 2 .na \fB\fBENOENT\fR\fR .ad .RS 16n A component of \fIpath\fR does not name an existing file or \fIpath\fR is an empty string. .RE .sp .ne 2 .na \fB\fBENOTDIR\fR\fR .ad .RS 16n A component of the path prefix is not a directory or the \fIpath\fR argument is relative and the \fIfildes\fR argument is not \fBAT_FDCWD\fR or does not refer to a valid directory. .RE .sp .ne 2 .na \fB\fBEPERM\fR\fR .ad .RS 16n The \fItimes\fR argument is not a null pointer and the calling process's effective user \fBID\fR has write access to the file but does not match the owner of the file and the calling process does not have the appropriate privileges. .RE .sp .ne 2 .na \fB\fBEROFS\fR\fR .ad .RS 16n The file system containing the file is read-only. .RE .sp .LP The \fButimes()\fR, \fBfutimesat()\fR, and \fButimensat()\fR functions may fail if: .sp .ne 2 .na \fB\fBENAMETOOLONG\fR\fR .ad .RS 16n Path name resolution of a symbolic link produced an intermediate result whose length exceeds {\fIPATH_MAX\fR}. .RE .SH ATTRIBUTES .LP See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Committed _ Standard See below. .TE .sp .LP For \fButimes()\fR, \fButimensat()\fR and \fBfutimensat()\fR, see \fBstandards\fR(5). .SH SEE ALSO .LP \fBfutimens\fR(2), \fBstat\fR(2), \fButime\fR(2), \fBattributes\fR(5), \fBfsattr\fR(5), \fBstandards\fR(5)