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 <endian.h> 19 #include <byteswap.h> 20 21 #include "ubd.h" 22 #include <os.h> 23 24 int start_io_thread(unsigned long sp, int *fd_out) 25 { 26 int pid, fds[2], err; 27 28 err = os_pipe(fds, 1, 1); 29 if(err < 0){ 30 printk("start_io_thread - os_pipe failed, err = %d\n", -err); 31 goto out; 32 } 33 34 kernel_fd = fds[0]; 35 *fd_out = fds[1]; 36 37 err = os_set_fd_block(*fd_out, 0); 38 if (err) { 39 printk("start_io_thread - failed to set nonblocking I/O.\n"); 40 goto out_close; 41 } 42 43 pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL); 44 if(pid < 0){ 45 err = -errno; 46 printk("start_io_thread - clone failed : errno = %d\n", errno); 47 goto out_close; 48 } 49 50 return(pid); 51 52 out_close: 53 os_close_file(fds[0]); 54 os_close_file(fds[1]); 55 kernel_fd = -1; 56 *fd_out = -1; 57 out: 58 return err; 59 } 60