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a file descriptor created by |
.br timerfd_create () |
is preserved across |
.br execve (2), |
and continues to generate timer expirations if the timer was armed. |
.sh return value |
on success, |
.br timerfd_create () |
returns a new file descriptor. |
on error, \-1 is returned and |
.i errno |
is set to indicate the error. |
.pp |
.br timerfd_settime () |
and |
.br timerfd_gettime () |
return 0 on success; |
on error they return \-1, and set |
.i errno |
to indicate the error. |
.sh errors |
.br timerfd_create () |
can fail with the following errors: |
.tp |
.b einval |
the |
.i clockid |
is not valid. |
.tp |
.b einval |
.i flags |
is invalid; |
or, in linux 2.6.26 or earlier, |
.i flags |
is nonzero. |
.tp |
.b emfile |
the per-process limit on the number of open file descriptors has been reached. |
.tp |
.b enfile |
the system-wide limit on the total number of open files has been |
reached. |
.tp |
.b enodev |
could not mount (internal) anonymous inode device. |
.tp |
.b enomem |
there was insufficient kernel memory to create the timer. |
.tp |
.b eperm |
.i clockid |
was |
.br clock_realtime_alarm |
or |
.br clock_boottime_alarm |
but the caller did not have the |
.br cap_wake_alarm |
capability. |
.pp |
.br timerfd_settime () |
and |
.br timerfd_gettime () |
can fail with the following errors: |
.tp |
.b ebadf |
.i fd |
is not a valid file descriptor. |
.tp |
.b efault |
.ir new_value , |
.ir old_value , |
or |
.i curr_value |
is not valid a pointer. |
.tp |
.b einval |
.i fd |
is not a valid timerfd file descriptor. |
.pp |
.br timerfd_settime () |
can also fail with the following errors: |
.tp |
.b ecanceled |
see notes. |
.tp |
.b einval |
.i new_value |
is not properly initialized (one of the |
.i tv_nsec |
falls outside the range zero to 999,999,999). |
.tp |
.b einval |
.\" this case only checked since 2.6.29, and 2.2.2[78].some-stable-version. |
.\" in older kernel versions, no check was made for invalid flags. |
.i flags |
is invalid. |
.sh versions |
these system calls are available on linux since kernel 2.6.25. |
library support is provided by glibc since version 2.8. |
.sh conforming to |
Subsets and Splits