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_util.h" 20 #include "kern_util.h" 21 #include "user.h" 22 #include "ubd_user.h" 23 #include "os.h" 24 #include "cow.h" 25 26 #include <endian.h> 27 #include <byteswap.h> 28 29 void ignore_sigwinch_sig(void) 30 { 31 signal(SIGWINCH, SIG_IGN); 32 } 33 34 int start_io_thread(unsigned long sp, int *fd_out) 35 { 36 int pid, fds[2], err; 37 38 err = os_pipe(fds, 1, 1); 39 if(err < 0){ 40 printk("start_io_thread - os_pipe failed, err = %d\n", -err); 41 goto out; 42 } 43 44 kernel_fd = fds[0]; 45 *fd_out = fds[1]; 46 47 pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM | SIGCHLD, 48 NULL); 49 if(pid < 0){ 50 printk("start_io_thread - clone failed : errno = %d\n", errno); 51 err = -errno; 52 goto out_close; 53 } 54 55 return(pid); 56 57 out_close: 58 os_close_file(fds[0]); 59 os_close_file(fds[1]); 60 kernel_fd = -1; 61 *fd_out = -1; 62 out: 63 return(err); 64 } 65 66 /* 67 * Overrides for Emacs so that we follow Linus's tabbing style. 68 * Emacs will notice this stuff at the end of the file and automatically 69 * adjust the settings for this buffer only. This must remain at the end 70 * of the file. 71 * --------------------------------------------------------------------------- 72 * Local variables: 73 * c-file-style: "linux" 74 * End: 75 */ 76