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 "kern_util.h" 20 #include "user.h" 21 #include "ubd_user.h" 22 #include "os.h" 23 #include "cow.h" 24 25 #include <endian.h> 26 #include <byteswap.h> 27 28 void ignore_sigwinch_sig(void) 29 { 30 signal(SIGWINCH, SIG_IGN); 31 } 32 33 int start_io_thread(unsigned long sp, int *fd_out) 34 { 35 int pid, fds[2], err; 36 37 err = os_pipe(fds, 1, 1); 38 if(err < 0){ 39 printk("start_io_thread - os_pipe failed, err = %d\n", -err); 40 goto out; 41 } 42 43 kernel_fd = fds[0]; 44 *fd_out = fds[1]; 45 46 err = os_set_fd_block(*fd_out, 0); 47 if (err) { 48 printk("start_io_thread - failed to set nonblocking I/O.\n"); 49 goto out_close; 50 } 51 52 pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM | SIGCHLD, 53 NULL); 54 if(pid < 0){ 55 err = -errno; 56 printk("start_io_thread - clone failed : errno = %d\n", errno); 57 goto out_close; 58 } 59 60 return(pid); 61 62 out_close: 63 os_close_file(fds[0]); 64 os_close_file(fds[1]); 65 kernel_fd = -1; 66 *fd_out = -1; 67 out: 68 return err; 69 } 70