rosapps/net/ncftp/sio/URecvfrom.c

   1 #include "syshdrs.h"
   2
   3 #if !defined(NO_UNIX_DOMAIN_SOCKETS) && !defined(NO_SIGNALS)
   4
   5 extern volatile Sjmp_buf gNetTimeoutJmp;
   6 extern volatile Sjmp_buf gPipeJmp;
   7
   8 int
   9 URecvfrom(int sfd, char *const buf, size_t size, int fl, struct sockaddr_un *const fromAddr, int *ualen, int tlen)
  10 {
  11         int nread, tleft;
  12         vsio_sigproc_t sigalrm, sigpipe;
  13         time_t done, now;
  14
  15         if (SSetjmp(gNetTimeoutJmp) != 0) {
  16                 alarm(0);
  17                 (void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
  18                 (void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
  19                 errno = ETIMEDOUT;
  20                 return (kTimeoutErr);
  21         }
  22
  23         if (SSetjmp(gPipeJmp) != 0) {
  24                 alarm(0);
  25                 (void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
  26                 (void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
  27                 errno = EPIPE;
  28                 return (kBrokenPipeErr);
  29         }
  30
  31         sigalrm = (vsio_sigproc_t) SSignal(SIGALRM, SIOHandler);
  32         sigpipe = (vsio_sigproc_t) SSignal(SIGPIPE, SIOHandler);
  33
  34         time(&now);
  35         done = now + tlen;
  36         tleft = (int) (done - now);
  37         forever {
  38                 *ualen = sizeof(struct sockaddr_un);
  39                 (void) alarm((unsigned int) tleft);
  40                 nread = recvfrom(sfd, buf, size, fl,
  41                         (struct sockaddr *) fromAddr, ualen);
  42                 (void) alarm(0);
  43                 if (nread >= 0)
  44                         break;
  45                 if (errno != EINTR)
  46                         break;          /* Fatal error. */
  47                 errno = 0;
  48                 time(&now);
  49                 tleft = (int) (done - now);
  50                 if (tleft < 1) {
  51                         nread = kTimeoutErr;
  52                         errno = ETIMEDOUT;
  53                         break;
  54                 }
  55         }
  56
  57         (void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
  58         (void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
  59
  60         return (nread);
  61 }       /* URecvfrom */
  62
  63 #endif