skalibs

Mirror/fork of https://skarnet.org/software/skalibs/
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ipc_timed_sendv.c (1073B)

      1 /* ISC license. */
      2 
      3 #include <skalibs/nonposix.h>
      4 
      5 #include <sys/socket.h>
      6 #include <errno.h>
      7 
      8 #include <skalibs/error.h>
      9 #include <skalibs/iopause.h>
     10 #include <skalibs/siovec.h>
     11 #include <skalibs/unix-timed.h>
     12 #include <skalibs/posixishard.h>
     13 
     14 int ipc_timed_sendv (int fd, struct iovec const *v, unsigned int n, tain const *deadline, tain *stamp)
     15 {
     16   struct msghdr hdr =
     17   {
     18     .msg_name = 0,
     19     .msg_namelen = 0,
     20     .msg_iov = (struct iovec *)v,
     21     .msg_iovlen = n,
     22     .msg_control = 0,
     23     .msg_controllen = 0,
     24     .msg_flags = 0
     25   } ;
     26   size_t len = siovec_len(v, n) ;
     27   iopause_fd x = { .fd = fd, .events = IOPAUSE_WRITE, .revents = 0 } ;
     28   for (;;)
     29   {
     30     int r = iopause_stamp(&x, 1, deadline, stamp) ;
     31     if (r < 0) return 0 ;
     32     else if (!r) return (errno = ETIMEDOUT, 0) ;
     33     else if (x.revents & IOPAUSE_WRITE)
     34     {
     35       if (sendmsg(fd, &hdr, MSG_NOSIGNAL) == (ssize_t)len) break ;
     36       if (!error_isagain(errno)) return 0 ;
     37     }
     38     else if (x.revents & IOPAUSE_EXCEPT) return (sendmsg(fd, &hdr, MSG_NOSIGNAL) == (ssize_t)len) ;
     39   }
     40   return 1 ;
     41 }