/arch/um/drivers/fd.c
https://bitbucket.org/evzijst/gittest · C · 108 lines · 81 code · 13 blank · 14 comment · 15 complexity · b668914341ef29e49b31e3b2fa1d9e62 MD5 · raw file
- /*
- * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <termios.h>
- #include <errno.h>
- #include "user.h"
- #include "user_util.h"
- #include "chan_user.h"
- struct fd_chan {
- int fd;
- int raw;
- struct termios tt;
- char str[sizeof("1234567890\0")];
- };
- static void *fd_init(char *str, int device, struct chan_opts *opts)
- {
- struct fd_chan *data;
- char *end;
- int n;
- if(*str != ':'){
- printk("fd_init : channel type 'fd' must specify a file "
- "descriptor\n");
- return(NULL);
- }
- str++;
- n = strtoul(str, &end, 0);
- if((*end != '\0') || (end == str)){
- printk("fd_init : couldn't parse file descriptor '%s'\n", str);
- return(NULL);
- }
- data = um_kmalloc(sizeof(*data));
- if(data == NULL) return(NULL);
- *data = ((struct fd_chan) { .fd = n,
- .raw = opts->raw });
- return(data);
- }
- static int fd_open(int input, int output, int primary, void *d, char **dev_out)
- {
- struct fd_chan *data = d;
- int err;
- if(data->raw && isatty(data->fd)){
- CATCH_EINTR(err = tcgetattr(data->fd, &data->tt));
- if(err)
- return(err);
- err = raw(data->fd);
- if(err)
- return(err);
- }
- sprintf(data->str, "%d", data->fd);
- *dev_out = data->str;
- return(data->fd);
- }
- static void fd_close(int fd, void *d)
- {
- struct fd_chan *data = d;
- int err;
- if(data->raw && isatty(fd)){
- CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &data->tt));
- if(err)
- printk("Failed to restore terminal state - "
- "errno = %d\n", -err);
- data->raw = 0;
- }
- }
- static int fd_console_write(int fd, const char *buf, int n, void *d)
- {
- struct fd_chan *data = d;
- return(generic_console_write(fd, buf, n, &data->tt));
- }
- struct chan_ops fd_ops = {
- .type = "fd",
- .init = fd_init,
- .open = fd_open,
- .close = fd_close,
- .read = generic_read,
- .write = generic_write,
- .console_write = fd_console_write,
- .window_size = generic_window_size,
- .free = generic_free,
- .winch = 1,
- };
- /*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */