core.5

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· 5 代码 · 共 62 行

.TH core 5 RISC
.SH Name
core \- format of memory image file
.SH Syntax
.B #include <sys/param.h>
.SH Description
When certain errors result in a terminated process, a
.PN 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
.MS sigvec 2 
reference page contains a list of the causes.
.PP
The 
.PN core 
is created in the working directory of the terminated process (normal
access controls apply).  
The maximum size of a
.PN core
cannot exceed the limit imposed by
.MS setrlimit 2 .
.PP
The 
.PN core 
file consists of the
.I u.
area, whose size (in pages) is
defined by the UPAGES manifest in the
.RI < sys/param.h >
file.  The 
.I u.
area starts with a 
.I user
structure as given in
.RI < sys/user.h >.
The remainder of the 
.PN 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 
.PN core 
file is given (in pages) by the
variable
.I u_dsize
in the
.I u.
area. The amount of stack image in the 
.PN core
file is given (in pages) by the
variable 
.I u_ssize
in the 
.I u.
area.
The size of a page is given by the constant NBPG
(also from
.RI < sys/param.h >).
.SH See Also
dbx(1), sigvec(2), setrlimit(2)