jailbreak developer iPhone (task_for_pid() expert)

Need to get task_for_pid() function to work on jailbreak iPhone under root.

My test environments iPhone 3GS 3.1.3 and iPhone 4 4.3.2.

Here is my sample code:

core line is this:

kr = task_for_pid(mach_task_self(), pid, &the_task);

according to FreeBSD and MacOS documentation if pid is correct it should return KERN_SUCCESS.

But in iOS in my case it returns KERN_FAILURE.



#include <stdlib.h>

#include <stdio.h>

#include <mach/mach.h>

int test_task_for_pid(pid_t pid)


kern_return_t kr;

task_t the_task;

printf ("Got PID: %d\n", pid);

printf ("The_task: 0x%x\n", the_task);

kr = task_for_pid(mach_task_self(), pid, &the_task);

if (kr != KERN_SUCCESS) {

printf ("kr: %d\n", kr);

printf ("The_task: 0x%x\n", the_task);

return -1;


printf ("SUCCES: The_task: 0x%x\n", the_task);

return 0;



main(int argc, char *argv[])


pid_t pid = strtol(argv[1], NULL, 10);

test_task_for_pid( pid );

return 0;





devel-iPhone:/home/devel/pid root# gcc -c -I/var/toolchain/sys30/usr/include pid.c -o pid.o

devel-iPhone:/home/devel/pid root# gcc -L/var/toolchain/sys30/usr/lib -lSystem pid.o -o pid

Note: in my case I'm compiling everything on iPhone and path to toolchain is /var/toolchain/sys30/usr/include

Please change this to match your setup.

For cross compilation on Mac I don't know.




devel-iPhone:/home/devel/pid root# ldid -S pid




devel-iPhone:/home/devel/pid root# ps ax

select any process. For example 202.

202 ?? Ss 0:02.68 /Applications/[url removed, login to view]

206 ?? S 0:01.99 /usr/sbin/sshd -i

213 ?? Ss 0:00.08 /usr/libexec/sftp-server

278 s001 R+ 0:00.00 ps ax

devel-iPhone:/home/devel/pid root# ./pid 202

here PID: 202

the_task: 848085017

kr: 5 <- HERE SHOULD BE 0

the_task: 0


executable or instructions to get this stuff working

Skills: C Programming, iPhone, Objective C

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