/* tee.c - cat to multiple outputs. * * Copyright 2008 Rob Landley <rob@landley.net> * * See http://opengroup.org/onlinepubs/9699919799/utilities/tee.html USE_TEE(NEWTOY(tee, "ia", TOYFLAG_BIN)) config TEE bool "tee" default y help usage: tee [-ai] [file...] Copy stdin to each listed file, and also to stdout. Filename "-" is a synonym for stdout. -a append to files. -i ignore SIGINT. */ #define FOR_tee #include "toys.h" GLOBALS( void *outputs; ) struct fd_list { struct fd_list *next; int fd; }; // Open each output file, saving filehandles to a linked list. static void do_tee_open(int fd, char *name) { struct fd_list *temp; temp = xmalloc(sizeof(struct fd_list)); temp->next = TT.outputs; temp->fd = fd; TT.outputs = temp; } void tee_main(void) { if (toys.optflags & FLAG_i) signal(SIGINT, SIG_IGN); // Open output files loopfiles_rw(toys.optargs, O_RDWR|O_CREAT|((toys.optflags & FLAG_a)?O_APPEND:O_TRUNC), 0666, 0, do_tee_open); for (;;) { struct fd_list *fdl; int len; // Read data from stdin len = xread(0, toybuf, sizeof(toybuf)); if (len<1) break; // Write data to each output file, plus stdout. fdl = TT.outputs; for (;;) { if(len != writeall(fdl ? fdl->fd : 1, toybuf, len)) toys.exitval=1; if (!fdl) break; fdl = fdl->next; } } }