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nanosleep.2freebsd

BSD mandoc

NAME

nanosleep - suspend process execution for an interval measured in nanoseconds

LIBRARY

Lb libc

SYNOPSIS

In time.h Ft int Fn nanosleep const struct timespec *rqtp struct timespec *rmtp

DESCRIPTION

The Fn nanosleep system call causes the calling thread to sleep until the time interval specified by Fa rqtp has elapsed. An unmasked signal will cause it to terminate the sleep early, regardless of the SA_RESTART value on the interrupting signal.

RETURN VALUES

If the Fn nanosleep system call returns because the requested time has elapsed, the value returned will be zero.

If the Fn nanosleep system call returns due to the delivery of a signal, the value returned will be -1, and the global variable errno will be set to indicate the interruption. If Fa rmtp is non- NULL the timespec structure it references is updated to contain the unslept amount (the request time minus the time actually slept).

ERRORS

The Fn nanosleep system call fails if:

Bq Er EFAULT

Either Fa rqtp or Fa rmtp points to memory that is not a valid part of the process address space.

Bq Er EINTR

The Fn nanosleep system call was interrupted by the delivery of a signal.

Bq Er EINVAL

The Fa rqtp argument specified a nanosecond value less than zero or greater than or equal to 1000 million.

Bq Er ENOSYS

The Fn nanosleep system call is not supported by this implementation.

SEE ALSO

sigsuspend(2), sleep(3)

STANDARDS

The Fn nanosleep system call conforms to St -p1003.1b-93 .