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 "ubd_user.h" 20 #include "os.h" 21 #include "cow.h" 22 23 #include <endian.h> 24 #include <byteswap.h> 25 26 void ignore_sigwinch_sig(void) 27 { 28 signal(SIGWINCH, SIG_IGN); 29 } 30 31 int start_io_thread(unsigned long sp, int *fd_out) 32 { 33 int pid, fds[2], err; 34 35 err = os_pipe(fds, 1, 1); 36 if(err < 0){ 37 printk("start_io_thread - os_pipe failed, err = %d\n", -err); 38 goto out; 39 } 40 41 kernel_fd = fds[0]; 42 *fd_out = fds[1]; 43 44 err = os_set_fd_block(*fd_out, 0); 45 if (err) { 46 printk("start_io_thread - failed to set nonblocking I/O.\n"); 47 goto out_close; 48 } 49 50 pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL); 51 if(pid < 0){ 52 err = -errno; 53 printk("start_io_thread - clone failed : errno = %d\n", errno); 54 goto out_close; 55 } 56 57 return(pid); 58 59 out_close: 60 os_close_file(fds[0]); 61 os_close_file(fds[1]); 62 kernel_fd = -1; 63 *fd_out = -1; 64 out: 65 return err; 66 } 67