ref: 0b9c6fa117c3fe571aed497579b3340b2f8a1164
dir: /sys/src/cmd/tee.c/
/* * tee-- pipe fitting */ #include <u.h> #include <libc.h> enum { FDSTART = 3, }; int uflag; int aflag; char in[8192]; int intignore(void*, char*); void main(int argc, char **argv) { int i; int r, n; ARGBEGIN { case 'a': aflag++; break; case 'i': atnotify(intignore, 1); break; case 'u': uflag++; /* uflag is ignored and undocumented; it's a relic from Unix */ break; default: fprint(2, "usage: tee [-ai] [file ...]\n"); exits("usage"); } ARGEND USED(argc); n = 0; while(*argv) { if(aflag) { i = open(argv[0], OWRITE); if(i < 0) i = create(argv[0], OWRITE, 0666); seek(i, 0L, 2); } else i = create(argv[0], OWRITE, 0666); if(i < 0) { fprint(2, "tee: cannot open %s: %r\n", argv[0]); } else { if(i != n+FDSTART) dup(i, n+FDSTART); n++; } argv++; } for(;;) { r = read(0, in, sizeof in); if(r <= 0) exits(nil); for(i=0; i<n; i++) write(i+FDSTART, in, r); write(1, in, r); } } int intignore(void *a, char *msg) { USED(a); if(strcmp(msg, "interrupt") == 0) return 1; return 0; }