panic(9) - NetBSD Manual Pages

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PANIC(9)                     NetBSD Kernel Manual                     PANIC(9)


NAME

     panic - Bring down system on fatal error


SYNOPSIS

     #include <sys/types.h>
     #include <sys/systm.h>

     void
     panic(const char *fmt, ...);


DESCRIPTION

     The panic() function terminates the NetBSD system.  The message fmt is a
     printf(3) style format string which is printed to the console and saved
     in the variable panicstr for later retrieval via core dump inspection.

     If a kernel debugger is installed, control is passed to it after the mes-
     sage is printed. If the kernel debugger is ddb(4), control is only passed
     if the value of the ddb.onpanic sysctl(3) is ``1'', otherwise, a
     ddb(4)-specific function is used to print the kernel stack trace, and
     then control returns to panic().

     If control remains in panic(), an attempt is made to save an image of
     system memory on the dump device that was configured at the time the ker-
     nel was compiled.

     If during the process of handling the panic, panic() is called again
     (from the filesystem synchronization routines, for example), the system
     is rebooted immediately without synchronizing any filesystems.


RETURN VALUES

     The panic() function does not return.


SEE ALSO

     sysctl(3), ddb(4), ipkdb(4), options(4), savecore(8), sysctl(8)

NetBSD 1.5.1                     May 26, 2000                                1