static int rs_open(struct tty_struct *tty, struct file * filp) { struct async_struct *info; int retval, line; line = tty->index; if ((line < 0) || (line >= NR_PORTS)) { return -ENODEV; } retval = get_async_struct(line, &info); if (retval) { return retval; } tty->driver_data = info; info->tty = tty; if (serial_paranoia_check(info, tty->name, "rs_open")) return -ENODEV; #ifdef SERIAL_DEBUG_OPEN printk("rs_open %s, count = %d\n", tty->name, info->state->count); #endif info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; /* * If the port is the middle of closing, bail out now */ if (tty_hung_up_p(filp) || (info->flags & ASYNC_CLOSING)) { if (info->flags & ASYNC_CLOSING) interruptible_sleep_on(&info->close_wait); #ifdef SERIAL_DO_RESTART return ((info->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS); #else return -EAGAIN; #endif } /* * Start up serial port */ retval = startup(info); if (retval) { return retval; } retval = block_til_ready(tty, filp, info); if (retval) { #ifdef SERIAL_DEBUG_OPEN printk("rs_open returning after block_til_ready with %d\n", retval); #endif return retval; } #ifdef SERIAL_DEBUG_OPEN printk("rs_open %s successful...", tty->name); #endif return 0; }
/* * This routine is called whenever a serial port is opened. It * enables interrupts for a serial port, linking in its async structure into * the IRQ chain. It also performs the serial-specific * initialization for the tty structure. */ static int pdc_open(struct tty_struct *tty, struct file *filp) { struct async_struct *info; int retval, line; unsigned long page; MOD_INC_USE_COUNT; line = MINOR(tty->device) - tty->driver.minor_start; if ((line < 0) || (line >= NR_PORTS)) { MOD_DEC_USE_COUNT; return -ENODEV; } retval = get_async_struct(line, &info); if (retval) { MOD_DEC_USE_COUNT; return retval; } tty->driver_data = info; info->tty = tty; pdc_drv_info = info; #ifdef PDC_DEBUG_OPEN printk("pdc_open %s%d, count = %d\n", tty->driver.name, info->line, info->state->count); #endif info->tty->low_latency = 0; if (!tmp_buf) { page = get_zeroed_page(GFP_KERNEL); if (!page) { MOD_DEC_USE_COUNT; return -ENOMEM; } if (tmp_buf) free_page(page); else tmp_buf = (unsigned char *) page; } info->session = current->session; info->pgrp = current->pgrp; #ifdef PDC_DEBUG_OPEN printk("pdc_open ttyB%d successful...", info->line); #endif pdc_drv_refcount++; return 0; }
/* * This routine is called whenever a serial port is opened. It * enables interrupts for a serial port, linking in its async structure into * the IRQ chain. It also performs the serial-specific * initialization for the tty structure. */ static int rs_open(struct tty_struct *tty, struct file * filp) { struct async_struct *info; int retval, line; unsigned long page; line = tty->index; if ((line < 0) || (line >= NR_PORTS)) return -ENODEV; retval = get_async_struct(line, &info); if (retval) return retval; tty->driver_data = info; info->tty = tty; #ifdef SIMSERIAL_DEBUG printk("rs_open %s, count = %d\n", tty->name, info->state->count); #endif info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; if (!tmp_buf) { page = get_zeroed_page(GFP_KERNEL); if (!page) return -ENOMEM; if (tmp_buf) free_page(page); else tmp_buf = (unsigned char *) page; } /* * If the port is the middle of closing, bail out now */ if (tty_hung_up_p(filp) || (info->flags & ASYNC_CLOSING)) { if (info->flags & ASYNC_CLOSING) interruptible_sleep_on(&info->close_wait); #ifdef SERIAL_DO_RESTART return ((info->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS); #else return -EAGAIN; #endif } /* * Start up serial port */ retval = startup(info); if (retval) { return retval; } /* * figure out which console to use (should be one already) */ console = console_drivers; while (console) { if ((console->flags & CON_ENABLED) && console->write) break; console = console->next; } #ifdef SIMSERIAL_DEBUG printk("rs_open ttys%d successful\n", info->line); #endif return 0; }