futimes, lutimes - change file timestamps
int futimes(int fd, const struct timeval tv);
int lutimes(const char *filename, const struct timeval tv);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.19:
Glibc 2.19 and earlier:
futimes() changes the access and modification times of a file in the same way as utimes(2), with the difference that the file whose timestamps are to be changed is specified via a file descriptor, fd, rather than via a pathname.
lutimes() changes the access and modification times of a file in the same way as utimes(2), with the difference that if filename refers to a symbolic link, then the link is not dereferenced: instead, the timestamps of the symbolic link are changed.
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
Errors are as for utimes(2), with the following additions for futimes():
- fd is not a valid file descriptor.
The following additional error may occur for lutimes():
- The /proc filesystem could not be accessed.
futimes() is available since glibc 2.3. lutimes() is available since glibc 2.6, and is implemented using the utimensat(2) system call, which is supported since kernel 2.6.22.
For an explanation of the terms used in this section, see attributes(7).
- The kernel does not support this call; Linux 2.6.22 or later is required.
These functions are not specified in any standard. Other than Linux, they are available only on the BSDs.
|Interface ||Attribute ||Value |
|futimes (), lutimes () ||Thread safety ||MT-Safe |