io_uring_prep_waitid(3)         liburing Manual        io_uring_prep_waitid(3)

NAME
       io_uring_prep_waitid - prepare a waitid request

SYNOPSIS
       #include <sys/wait.h>
       #include <liburing.h>

       void io_uring_prep_waitid(struct io_uring_sqe *sqe,
                                 idtype_t idtype,
                                 id_t id,
                                 siginfo_t *infop,
                                 int options,
                                 unsigned int flags);

DESCRIPTION
       The io_uring_prep_waitid(3) function prepares a waitid request. The
       submission queue entry sqe is setup to use the idtype and id arguments
       select the child(ren), and options to specify the child state changes
       to wait for. Upon successful return, it fills infop with information of
       the child process, if any.  flags is io_uring specific modifier flags.
       They are currently unused, and hence 0 should be passed.

       This function prepares an async waitid(2) request. See that man page
       for details.

       Available since kernel 6.7.


RETURN VALUE
       None

ERRORS
       The CQE res field will contain the result of the operation. See the
       related man page for details on possible values. Note that where
       synchronous system calls will return -1 on failure and set errno to the
       actual error value, io_uring never uses errno.  Instead it returns the
       negated errno directly in the CQE res field.

SEE ALSO
       io_uring_get_sqe(3), io_uring_submit(3), waitid(2)

liburing-2.5                     July 14, 2023         io_uring_prep_waitid(3)