core(5) — RISC
Name
core − format of memory image file
Syntax
#include <sys/param.h>
Description
When certain errors result in a terminated process, a core file is created that contains the memory image of a terminated process. A process can terminate for several reasons; however, the most common causes are memory violations, illegal instructions, bus errors, and user-generated quit signals. The sigvec() reference page contains a list of the causes.
The core is created in the working directory of the terminated process (normal access controls apply). The maximum size of a core cannot exceed the limit imposed by setrlimit(.).
The core file consists of the u. area, whose size (in pages) is defined by the UPAGES manifest in the <sys/param.h> file. The u. area starts with a user structure as given in <sys/user.h>. The remainder of the core file consists first of the data pages and then the stack pages of the process image. The amount of data space image in the core file is given (in pages) by the variable u_dsize in the u. area. The amount of stack image in the core file is given (in pages) by the variable u_ssize in the u. area. The size of a page is given by the constant NBPG (also from <sys/param.h>).