I'm trying to create a simplified version of dc to learn from. The first thing I notice is that the main stack stores strings. How would I implement a string stack in C? How is something like this:
Thoughts?
---------- Post updated at 06:33 PM ---------- Previous update was at 04:59 PM ----------
Actually I don't think I need the stackPtr because I can just use the basePtr + the logicalSize.
Hi,
I am implementing a shell in C, with the following problem...
Suppose the shell is invoked from the command line as
>> myshell < test.in > test.out 2>&1
I have to execute the commands in test.in and redirect them to test.out
How does one detect in the main function that the shell... (1 Reply)
Hello,
I am trying to implement TCP protocol in C.
I have read the RFC for TCP and have knowledge about it.
But I am stuck in coding.
Are ther any reference links, code snippets available for reference? (1 Reply)
I am trying to implement a login screen to the following code how would i go about doing so. I have try to place the password in a variable using if statements which would usually work but as i have the system in a while loop i think i need to find another method.
#!/bin/bash
#Filename:... (4 Replies)
I'm trying to add logging to an existing script which echos a number of lines to the screen. I've added a switch to the script that is going to suppress much of this output and put it in a file instead.
The way I envisioned it was like this:
$log would be set to either "" or the log files... (8 Replies)
i have following input file...
00290002STDR000000000000000000000000000EOD END TRANSACTION ^@^@^@^@^@^@^@^@^@^@^@^@^
00299998STDR070000000007000000000000000STANDING DEBITS ^@^@^@^@^@^@^@^@^@^@^@^@^... (1 Reply)
Hello All,
I am trying a shell script for automatically login to test servers and pulling the output of top command from all using expect.
----snippet of code ---
#!/usr/bin/expect -f
#!/bin/bash
server1=10.251.222.51
server=("$server1")
i=1
for exp_server in ${server}; do
expect -c... (3 Replies)
Hi,
I am new to the linux kernel development area. I want to know what is the difference between kernel mode stack and user mode stack? Does each process has a user mode stack and a kernel mode stack?? Or Each process has a user mode stack and there is only one kernel mode stack that is shared by... (4 Replies)
Discussion started by: saurabhkoar
4 Replies
LEARN ABOUT FREEBSD
stack_create
STACK(9) BSD Kernel Developer's Manual STACK(9)NAME
stack -- kernel thread stack tracing routines
SYNOPSIS
#include <sys/param.h>
#include <sys/stack.h>
In the kernel configuration file:
options DDB
options STACK
struct stack *
stack_create(void);
void
stack_destroy(struct stack *st);
int
stack_put(struct stack *st, vm_offset_t pc);
void
stack_copy(const struct stack *src, struct stack dst);
void
stack_zero(struct stack *st);
void
stack_print(const struct stack *st);
void
stack_print_ddb(const struct stack *st);
void
stack_print_short(const struct stack *st);
void
stack_print_short_ddb(const struct stack *st);
void
stack_sbuf_print(struct sbuf sb*, const struct stack *st);
void
stack_sbuf_print_ddb(struct sbuf sb*, const struct stack *st);
void
stack_save(struct stack *st);
DESCRIPTION
The stack KPI allows querying of kernel stack trace information and the automated generation of kernel stack trace strings for the purposes
of debugging and tracing. To use the KPI, at least one of options DDB and options STACK must be compiled into the kernel.
Each stack trace is described by a struct stack. Before a trace may be created or otherwise manipulated, storage for the trace must be allo-
cated with stack_create(), which may sleep. Memory associated with a trace is freed by calling stack_destroy().
A trace of the current kernel thread's call stack may be captured using stack_save().
stack_print() and stack_print_short() may be used to print a stack trace using the kernel printf(9), and may sleep as a result of acquiring
sx(9) locks in the kernel linker while looking up symbol names. In locking-sensitive environments, the unsynchronized stack_print_ddb() and
stack_print_short_ddb() variants may be invoked. This function bypasses kernel linker locking, making it usable in ddb(4), but not in a live
system where linker data structures may change.
stack_sbuf_print() may be used to construct a human-readable string, including conversion (where possible) from a simple kernel instruction
pointer to a named symbol and offset. The argument sb must be an initialized struct sbuf as described in sbuf(9). This function may sleep
if an auto-extending struct sbuf is used, or due to kernel linker locking. In locking-sensitive environments, such as ddb(4), the unsynchro-
nized stack_sbuf_print_ddb() variant may be invoked to avoid kernel linker locking; it should be used with a fixed-length sbuf.
The utility functions stack_zero, stack_copy, and stack_put may be used to manipulate stack data structures directly.
SEE ALSO ddb(4), printf(9), sbuf(9), sx(9)AUTHORS
The stack(9) function suite was created by Antoine Brodin. stack(9) was extended by Robert Watson for general-purpose use outside of ddb(4).
BSD November 16, 2011 BSD