ref: 4d4107b38547c7f9f135cc22d3a29fcbad4a8c34
dir: /sys/src/cmd/dial/pass.c/
#include <u.h> #include <libc.h> int alarmed; int done; void usage(void) { fprint(2, "usage: %s [-q]\n", argv0); exits("usage"); } void ding(void*, char *s) { if(strstr(s, "alarm")){ alarmed = 1; noted(NCONT); } else noted(NDFLT); } void main(int argc, char **argv) { int fd, cfd; int i; char buf[1]; int quiet = 0; ARGBEGIN { case 'q': quiet = 1; break; } ARGEND; notify(ding); fd = open("/dev/cons", ORDWR); if(fd < 0) sysfatal("opening /dev/cons: %r"); cfd = open("/dev/consctl", OWRITE); if(cfd >= 0) fprint(cfd, "rawon"); switch(rfork(RFPROC|RFFDG|RFMEM)){ case -1: sysfatal("forking: %r"); default: // read until we're done writing or // we get an end of line while(!done){ alarmed = 0; alarm(250); i = read(0, buf, 1); alarm(0); if(i == 0) break; if(i < 0){ if(alarmed) continue; else break; } if(!quiet && write(fd, buf, 1) < 1) break; if(buf[0] == '\n' || buf[0] == '\r') break; } break; case 0: // pass one character at a time till end of line for(;;){ if(read(fd, buf, 1) <= 0) break; if(write(1, buf, 1) < 0) break; if(buf[0] == '\n' || buf[0] == '\r') break; } // tell reader to give up after next char done = 1; break; } exits(0); }