PRISON_CHECK(9) BSD Kernel Developer's Manual PRISON_CHECK(9)NAME
prison_check -- determine if two credentials belong to the same jail
SYNOPSIS
#include <sys/jail.h>
int
prison_check(struct ucred *cred1, struct ucred *cred2);
DESCRIPTION
This function can be used to determine if the two credentials cred1 and cred2 belong to the same jail.
RETURN VALUES
The prison_check() function returns ESRCH if cred1 has been jailed, and cred1 and cred2 do not belong to the same jail. In all other cases,
prison_check() returns zero.
SEE ALSO jail(2)BSD December 11, 2003 BSD
Check Out this Related Man Page
P_CANSEE(9) BSD Kernel Developer's Manual P_CANSEE(9)NAME
p_cansee -- determine visibility of a process
SYNOPSIS
#include <sys/param.h>
#include <sys/proc.h>
int
p_cansee(struct thread *td, struct proc *p);
DESCRIPTION
This function can be used to determine if a given process p is visible to the thread td, where the notion of ``visibility'' may be read as
``awareness of existence''.
The function is implemented using cr_cansee(9), and the dependencies on sysctl(8) variables documented in the cr_cansee(9) manual page apply.
RETURN VALUES
The p_cansee() function returns 0 if the process denoted by p is visible by thread td, or a non-zero error return value otherwise.
ERRORS
[ESRCH] Process p is not visible to thread td as determined by cr_cansee(9).
[ESRCH] Thread td has been jailed and process p does not belong to the same jail as td.
[ESRCH] The MAC subsystem denied visibility.
SEE ALSO jail(2), sysctl(8), cr_cansee(9), mac(9), p_candebug(9), prison_check(9)BSD November 19, 2006 BSD
Introduction
Originally, we only had one shell on unix. When ran a command, the shell would attempt to invoke one of the exec() system calls on it. It the command was an executable, the exec would succeed and the command would run. If the exec() failed, the shell would not give up, instead it... (3 Replies)
FreeBSD Kernel Internals, Dr. Marshall Kirk McKusick
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The first hour of Marshall Kirk McKusick's course on FreeBSD kernel internals based on his book, The Design and Implementation of the FreeBSD Operating System. (0 Replies)
Introduction
I have seen some misinformation regarding Unix file permissions. I will try to set the record straight. Take a look at this example of some output from ls:
$ ls -ld /usr/bin /usr/bin/cat
drwxrwxr-x 3 root bin 8704 Sep 23 2004 /usr/bin
-r-xr-xr-x 1 bin bin ... (6 Replies)
Suppose I have a main() function with only one malloc statement allocating say some 1 gb memory. Also say my system has 1 gb of ram.
main()
{
malloc(1gb)
return(0)
}
The program above exits without freeing the memory.
In this case will the 1 gb of heap memory be returned... (9 Replies)
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Does this mean that it will run on any shell ?
Is it a good practice to create scripts (even ad-hoc ones) without shebang ? (16 Replies)
Hi everyone,
I know the following questions are noobish questions but I am asking them because I am confused about the basics of history behind UNIX and LINUX.
Ok onto business, my questions are-:
Was/Is UNIX ever an open source operating system ?
If UNIX was... (21 Replies)
A shout out to Scott who gave me a helping hand to turn a simple sample Vue.js app I wrote yesterday into a Vue.js component:
Vue.component("unix-time", {
template: `<div class="time">{{unixtime}}</div>`,
data() {
return {
unixtime: ""
};
},
methods: {
... (1 Reply)
i read here that linux provides no way to determine when a directory was created.
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That file says
I put the script in that directory and... (3 Replies)
Hello.
I can use any particular (stupid or not) format when using bash date command.
Example :
~> date --date "now" '+%Y-%m-%d %H!%M!%S'
2019-06-03 12!55!33or
~> date --date "now" '+%Y£%m£%d %H¤%M¤%S'
2019£06£03 12¤57¤36
or
~> date --date "now" '+%Y-%m-%d %H-%M-%S'
2019-06-03 12-58-51
... (4 Replies)
Morning All
So, I am starting looking into the world of UNIX for a new job (luckily not my primary function!) and I am looking to get stared. Like anything I seem to learn best by trying things out first in an environment but I have a key question:
Currently I use Oracle VirtualBox, can... (8 Replies)
I've installed Slack 14.2 on /dev/sda1 (/dev/sda2 is swap) and FreeBSD 12 on /dev/sda3 and lilo is the boot manager.
FreeBSD slices are as follows;
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I hesitate to install Solaris 10... (2 Replies)
I'm trying to use a bash script for a psych experiment that involves listening to sound files and responding. If I have something like the code below, how can I make sure that a key press is assigned to RESPONSE only after the second echo statement?
for i in 1 2 3; do
echo "Ready?"
sleep 2
... (10 Replies)