diff options
author | Dmitry Bogatov <KAction@debian.org> | 2018-11-29 05:18:28 +0000 |
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committer | Dmitry Bogatov <KAction@debian.org> | 2018-11-29 05:18:28 +0000 |
commit | b19ff825af9758fa905bf0ba29bbff66fa66cd50 (patch) | |
tree | 4a6fc0b53bb646a038a422b7ef90d65968fde149 /iopause.c | |
parent | 35c0ccd3b0eedd2d14e26a109f5812a5c30c38aa (diff) |
Import Upstream version 0.88
Diffstat (limited to 'iopause.c')
-rw-r--r-- | iopause.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/iopause.c b/iopause.c new file mode 100644 index 0000000..b8034de --- /dev/null +++ b/iopause.c @@ -0,0 +1,76 @@ +#include "taia.h" +#include "select.h" +#include "iopause.h" + +void iopause(iopause_fd *x,unsigned int len,struct taia *deadline,struct taia *stamp) +{ + struct taia t; + int millisecs; + double d; + int i; + + if (taia_less(deadline,stamp)) + millisecs = 0; + else { + t = *stamp; + taia_sub(&t,deadline,&t); + d = taia_approx(&t); + if (d > 1000.0) d = 1000.0; + millisecs = d * 1000.0 + 20.0; + } + + for (i = 0;i < len;++i) + x[i].revents = 0; + +#ifdef IOPAUSE_POLL + + poll(x,len,millisecs); + /* XXX: some kernels apparently need x[0] even if len is 0 */ + /* XXX: how to handle EAGAIN? are kernels really this dumb? */ + /* XXX: how to handle EINVAL? when exactly can this happen? */ + +#else +{ + + struct timeval tv; + fd_set rfds; + fd_set wfds; + int nfds; + int fd; + + FD_ZERO(&rfds); + FD_ZERO(&wfds); + + nfds = 1; + for (i = 0;i < len;++i) { + fd = x[i].fd; + if (fd < 0) continue; + if (fd >= 8 * sizeof(fd_set)) continue; /*XXX*/ + + if (fd >= nfds) nfds = fd + 1; + if (x[i].events & IOPAUSE_READ) FD_SET(fd,&rfds); + if (x[i].events & IOPAUSE_WRITE) FD_SET(fd,&wfds); + } + + tv.tv_sec = millisecs / 1000; + tv.tv_usec = 1000 * (millisecs % 1000); + + if (select(nfds,&rfds,&wfds,(fd_set *) 0,&tv) <= 0) + return; + /* XXX: for EBADF, could seek out and destroy the bad descriptor */ + + for (i = 0;i < len;++i) { + fd = x[i].fd; + if (fd < 0) continue; + if (fd >= 8 * sizeof(fd_set)) continue; /*XXX*/ + + if (x[i].events & IOPAUSE_READ) + if (FD_ISSET(fd,&rfds)) x[i].revents |= IOPAUSE_READ; + if (x[i].events & IOPAUSE_WRITE) + if (FD_ISSET(fd,&wfds)) x[i].revents |= IOPAUSE_WRITE; + } + +} +#endif + +} |