On Mon, 25 Feb 2008, Arvid Brodin wrote: > I need to write messages > 1023 characters long to the console from a > module*. printk() is limited to 1023 characters, and splitting the message > over several printk()'s results in a line break and "Month hh:mm:ss host > kernel:" being inserted in my text. > > I tried including <linux/console.h> and using the console_drivers declared > there, but get > "WARNING: "console_drivers" [<path>/log.ko] undefined!" when compiling and > "insmod: error inserting 'log.ko': -1 Unknown symbol in module" when > insmodding. > > I guess this is because non EXPORT_SYMBOL'd symbols are only accessible to > statically linked code, and not to modules? I see in printk.c that > console_drivers is set up there, and I haven't been able to find any other > interface to console_drivers. > > In short: is there any way to print messages to the console from a kernel > module, except printk()? Is opening /dev/tty and writing to it the way to go? > > > * I'm writing an in-memory logger to be included in a module. The log can be > several megabytes. The idea is to use SysRq to print the contents of the log > to console after a kernel panic or otherwise when writing to disk might not > work. > > -- > Arvid Brodin > Enea LCC
Write the data to a kernel buffer. Impliment read() or ioctl() and poll(). Have a user-mode task sleep in poll, waiting for data to become available. That user-mode task can do anything it wants, unrestricted, with the data including writing it to files or any tty it wants to open. Cheers, Dick Johnson Penguin : Linux version 2.6.22.1 on an i686 machine (5588.28 BogoMips). My book : http://www.AbominableFirebug.com/ _ **************************************************************** The information transmitted in this message is confidential and may be privileged. Any review, retransmission, dissemination, or other use of this information by persons or entities other than the intended recipient is prohibited. If you are not the intended recipient, please notify Analogic Corporation immediately - by replying to this message or by sending an email to [EMAIL PROTECTED] - and destroy all copies of this information, including any attachments, without reading or disclosing them. Thank you. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
