On Sun, Feb 06, 2011 at 05:23:01PM +0800, loody wrote: > hi: > > 2011/2/6 loody <miloody@xxxxxxxxx>: > > hi all: > > I want to use snprintf for collecting debug message and print it later. > > But I found : > > 1. when I add "\n" as below, the buffer will be cleared, that means > > the "irq status" will put at the head of Buffer instead of at the end > > of "ehci work". > > Size -= snprintf (Buffer , Size,"ehci_work\n"); > > Size -= snprintf (Buffer , Size,"irq status 0x%x\n",status); > > is it possible to add "\n" in the buffer, but will will not reset the buffer? > > > > 2. instead of snprintf, is there any better idea for saving debug > > message and show it out later? > 3. is there any function in kernel, like snprintf, which will also > collect strings but tread the buffer as ring buffer, such that I will > not need to take care the overflow. Look at include/linux/ring_buffer.h _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
