Currently I am working on developing a GUI to some command line tools for Jailbroken iOS devices. I am using NSTask and verified that I was able to capture both stdout and stderr error and print the output to a UITextField. How ever most of the commands that I wish to run are not outputting anything. I suspect that setting up a pseudo tty session would fix this but am unable to find how to set this up in obj-c. My question is
1) Does this sound reasonable that the commands (namely arp-scan and nmap) need a TTY session?
2) How would I go about setting up a fake TTY session in Obj-c?
Related
I'm creating a program (executable binary) in Objective-C that I can run on terminal/cli. When I use os_log to log something, it appears on Console app. But I want the log output to appear on the cli when I run the program, just like printf behavior. How to make os_log to do that?
I am trying to run an application which uses pagemap in gem5 FS mode.
But I am not able to use pagemap in gem5. It throws below error -
"assert(pagemap>=0) failed"
The line of code is:
int pagemap = open("/proc/self/pagemap", O_RDONLY);
assert(pagemap >= 0);
Also, If I try to run my application on gem5 terminal with sudo ,it throws error-
sudo command not found
How can I use sudo in gem5 ??
These problems are not gem5 specific, but rather image / Linux specific, and would likely happen on any simulator or real hardware. So I recommend that you remove gem5 from the equation completely, and ask a Linux or image specific question next time, saying exactly what image your are using, kernel configs, and provide a minimal C example that reproduces the problem: this will greatly improve the probability that you will get help.
I have just done open("/proc/self/pagemap", O_RDONLY) successfully with: this program and on this fs.py setup on aarch64, see also these comments.
If /proc/<pid>/pagemap is not present for any file, do the following:
ensure that procfs is mounted on /proc. This is normally done with an fstab entry of type:
proc /proc proc defaults 0 0
but your init script needs to use fstab as well.
Alternatively, you can mount proc manually with:
mount -t proc proc proc/
you will likely want to ensure that /sys and /dev are mounted as well.
grep the kernel to see if there is some config controlling the file creation.
These kinds of things are often easy to find without knowing anything about the kernel.
If I do:
git grep '"pagemap'
to find the pagemap string, which is likely the creation point, on v4.18 this leads me to fs/proc/base.c, which contains:
#ifdef CONFIG_PROC_PAGE_MONITOR
REG("pagemap", S_IRUSR, proc_pagemap_operations),
#endif
so make sure CONFIG_PROC_PAGE_MONITOR is set.
sudo: most embedded / simulator images don't have it, you just login as root directly and can do anything by default without it. This can be seen by the conventional # in the prompt instead of $.
I am getting the list of running applications in Cocoa with the following code:
for (NSRunningApplication *app in [[NSWorkspace sharedWorkspace] runningApplications]) {
MNSLog(#"%#",[app localizedName]);
}
However an application I started from a terminal session is not appearing in the list ('Terminal' is well appearing). The application was started from the same user which is executing the cocoa code.Is my launched application under Terminal ? And in such a case how can I find its name and arguments ?Running ps in another terminal session show my process properly.
Use an NSTask to execute the ps Shell command. You can check the ps man page to determine which arguments you want to pass it based on the information you want to get back. Use NSPipe and NSFileHandle to get the results from the task.
If you want to do some filtering you can pipe the ps output through grep before your app picks up the result.
For your first question, I think NSWorkspace can only see apps that use the window server so you will only see Terminal, not the executables that it is running internally.
You can use sysctl or ps command to get a list of all BSD processes. Have look at unable to detect application running with another user
I'm trying to restart a custom IRC bot. I tried various commands :
load.php
daemon load.php
daemon load.php &&
But that makes the script execute inside the console (I see all the output) and when I quit the bot quits as well.
The bot author only taught me the IRC commands so I'm a bit lost.
You can install a package called screen. Then, run screen -dm php load.php and resume with screen -dR
This will allow you to run the script in the background, and still be able to use your current SSH terminal. You can also logout and the process will still be running.
Chances are good the shell is sending the HUP signal to all its running children when you log out to indicate that "the line has been hung up" (a plain old telephone system modem reference to a line being "hung up" when disconnected. You know, because you "hang" the handset on the hook...)
The HUP signal will ask all programs to die conveniently.
Try this:
nohup load.php &
The nohup asks for the next program executed to ignore the HUP signal. See signal(7) and the nohup(1) manpages for details. The & asks the shell to execute the program in the background.
Clay's answer of using screen(1) is pretty awesome, definitely look into screen(1) or tmux(1), but I don't think that they are necessary for this problem.
This line might help you
php load.php &
On windows and such I used to use a trick to find out of a file is currently in use (written specifically).
I use to open the file for writing and if it failed most likey another process is busy accessing it.
Sadly these trick (using C OPEN with exclusive lock for writing) doesn't work on my Mac. While my curl in a terminal is still writing my -fileBusy() check fails.
fcnt call on the fd with F_GETLK doesn't reveal any locking as well.
Is there any chance for me to detect if a file is in use by another process?
Ps> listening for fsevents can't be done because my app launches after the is created by the other app / process.
Apple confirmed via email that the solution described in the link below is a valid one and not considered a private API.
More information:
http://lists.apple.com/archives/cocoa-dev/2010/May/msg01455.html
You could try running the following shell command using NSTask:
lsof -Fc path/to/thefile
That will give you the process ID and name of any process(es) that have thefile open.