ref: 04c4a9ca8b06e34a203f7ddacc2263cf2077e1aa
dir: /sys/src/cmd/cec/plan9.c/
/* Copyright © Coraid, Inc. 2006. All rights reserved. */ #include <u.h> #include <libc.h> #include "cec.h" int fd = -1; int cfd = -1; int efd = -1; int netopen0(char *e) { char buf[128], ctl[13]; int n; snprint(buf, sizeof buf, "%s/clone", e); if((efd = open(buf, ORDWR)) == -1) return -1; memset(ctl, 0, sizeof ctl); if(read(efd, ctl, sizeof ctl) < 0) return -1; n = atoi(ctl); snprint(buf, sizeof buf, "connect %d", Etype); if(write(efd, buf, strlen(buf)) != strlen(buf)) return -1; snprint(buf, sizeof buf, "%s/%d/ctl", e, n); if((cfd = open(buf, ORDWR)) < 0) return -1; snprint(buf, sizeof buf, "nonblocking"); if(write(cfd, buf, strlen(buf)) != strlen(buf)) return -1; snprint(buf, sizeof buf, "%s/%d/data", e, n); fd = open(buf, ORDWR); return fd; } void netclose(void) { close(efd); close(cfd); close(fd); efd = -1; cfd = -1; fd = -1; } int netopen(char *e) { int r; if((r = netopen0(e)) >= 0) return r; perror("netopen"); netclose(); return -1; } /* what if len < netlen? */ int netget(void *v, int len) { int l; l = read(fd, v, len); if(debug && l > 0){ fprint(2, "read %d bytes\n", l); dump((uchar*)v, l); } if (l <= 0) return 0; return l; } int netsend(void *v, int len) { uchar *p; p = v; if (debug) { fprint(2, "sending %d bytes\n", len); dump(p, len); } if (len < 60) len = 60; /* mintu */ return write(fd, p, len); }