1io_uring_prep_send(3)           liburing Manual          io_uring_prep_send(3)
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NAME

6       io_uring_prep_send - prepare a send request
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SYNOPSIS

9       #include <liburing.h>
10
11       void io_uring_prep_send(struct io_uring_sqe *sqe,
12                               int sockfd,
13                               const void *buf,
14                               size_t len,
15                               int flags);
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17       void io_uring_prep_sendto(struct io_uring_sqe *sqe,
18                                 int sockfd,
19                                 const void *buf,
20                                 size_t len,
21                                 int flags,
22                                 const struct sockaddr *addr,
23                                 socklen_t addrlen);
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DESCRIPTION

26       The io_uring_prep_send(3) function prepares a send request. The submis‐
27       sion queue entry sqe is setup to use  the  file  descriptor  sockfd  to
28       start  sending  the  data  from buf of size len bytes and with modifier
29       flags flags.
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31       Note that using IOSQE_IO_LINK with this request type requires the  set‐
32       ting of MSG_WAITALL in the flags argument, as a short send isn't a con‐
33       sidered an error condition without that being set.
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35       This function prepares an async send(2) request. See that man page  for
36       details.
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38       The  io_uring_prep_sendto(3)  function  prepares  a sendto request. The
39       submission queue entry sqe is setup to use the file  descriptor  sockfd
40       to  start sending the data from buf of size len bytes and with modifier
41       flags flags.  The destination address is specified by addr and  addrlen
42       and must be a valid address for the socket type.
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44       This  function  prepares  an async sendto(2) request. See that man page
45       for details.
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RETURN VALUE

49       None
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ERRORS

52       The CQE res field will contain the result of the operation. See the re‐
53       lated man page for details on possible values. Note that where synchro‐
54       nous system calls will return -1 on failure and set errno to the actual
55       error value, io_uring never uses errno.  Instead it returns the negated
56       errno directly in the CQE res field.
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SEE ALSO

59       io_uring_get_sqe(3), io_uring_submit(3), send(2) sendto(2)
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63liburing-2.2                    March 12, 2022           io_uring_prep_send(3)
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