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| .TH FUTIMES 3 2016-03-15 "Linux" "Linux Programmer's Manual" |
| .SH NAME |
| futimes, lutimes \- change file timestamps |
| .SH SYNOPSIS |
| .nf |
| .B #include <sys/time.h> |
| |
| .BI "int futimes(int " fd ", const struct timeval " tv [2]); |
| |
| .BI "int lutimes(const char *" filename ", const struct timeval " tv [2]); |
| .fi |
| .sp |
| .in -4n |
| Feature Test Macro Requirements for glibc (see |
| .BR feature_test_macros (7)): |
| .in |
| .sp |
| .BR futimes (), |
| .BR lutimes (): |
| Since glibc 2.19: |
| _DEFAULT_SOURCE |
| Glibc 2.19 and earlier: |
| _BSD_SOURCE |
| .SH DESCRIPTION |
| .BR futimes () |
| changes the access and modification times of a file in the same way as |
| .BR utimes (2), |
| with the difference that the file whose timestamps are to be changed |
| is specified via a file descriptor, |
| .IR fd , |
| rather than via a pathname. |
| |
| .BR lutimes () |
| changes the access and modification times of a file in the same way as |
| .BR utimes (2), |
| with the difference that if |
| .I filename |
| refers to a symbolic link, then the link is not dereferenced: |
| instead, the timestamps of the symbolic link are changed. |
| .SH RETURN VALUE |
| On success, zero is returned. |
| On error, \-1 is returned, and |
| .I errno |
| is set appropriately. |
| .SH ERRORS |
| Errors are as for |
| .BR utimes (2), |
| with the following additions for |
| .BR futimes (): |
| .TP |
| .B EBADF |
| .I fd |
| is not a valid file descriptor. |
| .TP |
| .B ENOSYS |
| The |
| .I /proc |
| filesystem could not be accessed. |
| .PP |
| The following additional error may occur for |
| .BR lutimes (): |
| .TP |
| .B ENOSYS |
| The kernel does not support this call; Linux 2.6.22 or later is required. |
| .SH VERSIONS |
| .BR futimes () |
| is available since glibc 2.3. |
| .BR lutimes () |
| is available since glibc 2.6, and is implemented using the |
| .BR utimensat (2) |
| system call, which is supported since kernel 2.6.22. |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .TS |
| allbox; |
| lbw20 lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR futimes (), |
| .BR lutimes () |
| T} Thread safety MT-Safe |
| .TE |
| .SH CONFORMING TO |
| These functions are not specified in any standard. |
| Other than Linux, they are available only on the BSDs. |
| .SH SEE ALSO |
| .BR utime (2), |
| .BR utimensat (2), |
| .BR symlink (7) |