pid_t
getpid(
void
)
pid_t
getppid(
void
)
)
returns
the process ID of
the calling process.
The ID is guaranteed to be unique and is
useful for constructing temporary file names.
getppid()
returns the process ID of the parent
of the calling process.
)
and
getppid(
)
functions are always successful, and no return value is reserved to
indicate an error.
)
and
getppid(
)
conform to
ISO/IEC 9945-1:1990 (``POSIX.1'') .