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