1 /* 2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) 3 * Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com) 4 * Licensed under the GPL 5 */ 6 7 #include <stddef.h> 8 #include <unistd.h> 9 #include <errno.h> 10 #include <sched.h> 11 #include <signal.h> 12 #include <string.h> 13 #include <netinet/in.h> 14 #include <sys/time.h> 15 #include <sys/socket.h> 16 #include <sys/mman.h> 17 #include <sys/param.h> 18 #include "asm/types.h" 19 #include "user.h" 20 #include "ubd_user.h" 21 #include "os.h" 22 #include "cow.h" 23 24 #include <endian.h> 25 #include <byteswap.h> 26 27 void ignore_sigwinch_sig(void) 28 { 29 signal(SIGWINCH, SIG_IGN); 30 } 31 32 int start_io_thread(unsigned long sp, int *fd_out) 33 { 34 int pid, fds[2], err; 35 36 err = os_pipe(fds, 1, 1); 37 if(err < 0){ 38 printk("start_io_thread - os_pipe failed, err = %d\n", -err); 39 goto out; 40 } 41 42 kernel_fd = fds[0]; 43 *fd_out = fds[1]; 44 45 err = os_set_fd_block(*fd_out, 0); 46 if (err) { 47 printk("start_io_thread - failed to set nonblocking I/O.\n"); 48 goto out_close; 49 } 50 51 pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL); 52 if(pid < 0){ 53 err = -errno; 54 printk("start_io_thread - clone failed : errno = %d\n", errno); 55 goto out_close; 56 } 57 58 return(pid); 59 60 out_close: 61 os_close_file(fds[0]); 62 os_close_file(fds[1]); 63 kernel_fd = -1; 64 *fd_out = -1; 65 out: 66 return err; 67 } 68