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63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
#include "syshdrs.h"
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#if !defined(NO_UNIX_DOMAIN_SOCKETS) && !defined(NO_SIGNALS)
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extern volatile Sjmp_buf gNetTimeoutJmp;
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extern volatile Sjmp_buf gPipeJmp;
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int
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URecvfrom(int sfd, char *const buf, size_t size, int fl, struct sockaddr_un *const fromAddr, int *ualen, int tlen)
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{
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int nread, tleft;
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vsio_sigproc_t sigalrm, sigpipe;
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time_t done, now;
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if (SSetjmp(gNetTimeoutJmp) != 0) {
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alarm(0);
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(void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
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(void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
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errno = ETIMEDOUT;
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return (kTimeoutErr);
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}
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if (SSetjmp(gPipeJmp) != 0) {
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alarm(0);
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(void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
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(void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
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errno = EPIPE;
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return (kBrokenPipeErr);
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}
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sigalrm = (vsio_sigproc_t) SSignal(SIGALRM, SIOHandler);
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sigpipe = (vsio_sigproc_t) SSignal(SIGPIPE, SIOHandler);
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time(&now);
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done = now + tlen;
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tleft = (int) (done - now);
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forever {
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*ualen = sizeof(struct sockaddr_un);
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(void) alarm((unsigned int) tleft);
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nread = recvfrom(sfd, buf, size, fl,
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(struct sockaddr *) fromAddr, ualen);
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(void) alarm(0);
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if (nread >= 0)
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break;
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if (errno != EINTR)
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break; /* Fatal error. */
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errno = 0;
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time(&now);
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tleft = (int) (done - now);
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if (tleft < 1) {
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nread = kTimeoutErr;
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errno = ETIMEDOUT;
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break;
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}
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}
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(void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
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(void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
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return (nread);
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} /* URecvfrom */
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#endif
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