LinuxQuestions.org
Page 1 of 2 1 2
Show 50 post(s) from this thread on one page

LinuxQuestions.org (/questions/)
-   Programming (https://www.linuxquestions.org/questions/programming-9/)
-   -   problem with adding a system call (https://www.linuxquestions.org/questions/programming-9/problem-with-adding-a-system-call-187945/)

newcat 05-31-2004 05:45 AM
problem with adding a system call
 
Hello all,

I am new here and tried to add 4 system call to my kernel on redhat 9.

This is what I did :

In /usr/src/linux-2.4/include/linux/wait.h, I added

struct evnt_queue
{
struct evnt_queue *next_event;
wait_queue_head_t waitq;
int eid;
};

In /usr/src/linux-2.4/arch/i386/kernel/entry.S I added
.long SYMBOL_NAME(sys_evntopen)
.long SYMBOL_NAME(sys_evntclose) /* 260 */
.long SYMBOL_NAME(sys_evntwait)
.long SYMBOL_NAME(sys_evntsig)

In /usr/src/linux-2.4/include/asm/unistd.h I added

#define __NR_evntopen 259
#define __NR_evntclose 260
#define __NR_evntwait 261
#define __NR_evntsig 262

In /usr/src/linux-2.4/init/main.c I added

struct evnt_queue *eq;

static void __init event_init(void)
{
eq=(struct evnt_queue *)kmalloc(
sizeof(struct evnt_queue), GFP_KERNEL);
eq->next_event=NULL;
eq->eid=0;
init_waitqueue_head(&(eq->waitq));
}
asmlinkage void __init start_kernel(void)
{
......
event_init(); /* last statement */
}


In /usr/src/linux/kernel/sys.c : I add the code of the new system call
asmlinkage int sys_eventopen(int eid)
{
int newid=-1;
struct event_queue *temp;

printk("sys_eventopen");
if (eq==NULL)
{
eq=(struct event_queue *)kmalloc(
sizeof(struct event_queue), GFP_KERNEL);
eq->next_event=NULL;
eq->eid=0;
init_waitqueue_head(&(eq->waitq));
}

temp=eq->next_event;
if (eid>0)
{
while ((temp!=NULL)&&(temp->eid!=eid))
{
temp=temp->next_event;
}
if ((temp!=NULL)&&(temp->eid==eid)) newid=eid;
}
else if (eid==0)
{
while (temp!=NULL)
{
if (newid<temp->eid) newid=temp->eid;
temp=temp->next_event;
}
newid++;
if (newid<1) newid=1;
temp=(struct event_queue *)kmalloc(
sizeof(struct event_queue), GFP_KERNEL);
if (temp==NULL) newid=-1;
else
{
temp->eid=newid;
temp->next_event=eq->next_event;
eq->next_event=temp;
init_waitqueue_head(&(temp->waitq));
}
}

return(newid);
}

asmlinkage int sys_eventclose(int eid)
{
int result=-1;
struct event_queue *prev, *temp;

printk("sys_eventclose");
prev=eq;
temp=prev->next_event;
while ((temp!=NULL)&&(temp->eid!=eid))
{
prev=temp;
temp=prev->next_event;
}

if ((temp!=NULL)&&(waitqueue_active(&(temp->waitq))))
wake_up_interruptible(&(temp->waitq));
if (temp!=NULL)
{
result=0;
prev->next_event=temp->next_event;
kfree(temp);
}

return(result);
}

asmlinkage int sys_eventwait(int eid)
{

int result=-1;
struct event_queue *temp;

printk("sys_eventwait");
temp=eq->next_event;
while ((temp!=NULL)&&(temp->eid!=eid))
{
temp=temp->next_event;
}

if (temp!=NULL)
{
result=0;
interruptible_sleep_on(&(temp->waitq));
}

return(result);
}

asmlinkage int sys_eventsig(int eid)
{

int result=-1;
struct event_queue *temp;

printk("sys_eventsig");
temp=eq->next_event;
while ((temp!=NULL)&&(temp->eid!=eid))
{
temp=temp->next_event;
}

if (temp!=NULL)
{
result=0;
wake_up_interruptible(&(temp->waitq));
}

return(result);
}


And this is the test programm which use the system call :

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <linux/unistd.h>
#include <linux/wait.h>


_syscall1(int, eventopen, int, eid);
_syscall1(int, eventclose, int, eid);
_syscall1(int, eventwait, int, eid);
_syscall1(int, eventsig, int, eid);


void *task_wait(void *eid) /* eventwait */
{
printf("event %d waiting\n", eid);
eventwait((int)eid);
printf("event %d waked up\n", eid);
}


void *task_signal(void *eid) /* eventsig */
{
printf("event %d signaling\n", eid);
eventsig((int)eid);
}


int main(int arg, char ** argv)
{
int i, k, n;
int eids[10];
pthread_t tasks[10];

n=3; /* open 3 threads */

for (i=0; i<n; i++)
{
eids[i]=eventopen(0); /* open events */
if (eids[i]>0) printf("event %d opened\n", eids[i]);
else printf("event #%d could not open\n", i);
}

for (i=0; i<n; i++)
{
/* creat threads */
pthread_create(&tasks[i], NULL, task_wait, (void *)eids[i]);
sleep(2);
}

for (i=n-1; i>=0; i--)
{
pthread_create(&tasks[i], NULL, task_signal, (void *)eids[i]);
sleep(2);
}

for (i=0; i<n; i++)
{
k=eventclose(eids[i]); /* test eventclose */
if (k==0) printf("event %d closed\n", eids[i]);
else printf("event %d could not close\n", eids[i]);
}

for (i=0; i<n; i++)
{
pthread_join(tasks[i], NULL);
}

return(0);
}

Everything seems to be OK but when I try to run the test program only
sys_eventopen was called and printed in the log file.

Could anyone help me ?

Thanks a lot

newcat

infamous41md 05-31-2004 12:05 PM
here's a dumb question, are you sure that event_close is being called? and tahnks for the inspiration, that looks like fun im going to try it later 2nite :D

newcat 05-31-2004 01:27 PM
In my log file (/var/log/message) only sys_eventopen was printed. sys_eventclose, sys_eventsig, sys_eventwait were not printed in the log file:

"May 30 01:57:10 localhost kernel: sys_eventopen
May 30 01:57:10 localhost kernel: last message repeated 2 times"

Thanks,

newcat

infamous41md 05-31-2004 03:01 PM
no i mean in main(), in your actual program. are u familiar with the strace utility? i would try using that to see what's going on

newcat 05-31-2004 04:59 PM
The output of the program is:

"event 1 opened
event 2 opened
event 3 opened
event 1 waiting
event 1 waked up
event 2 waiting
event 2 waked up
event 3 waiting
event 3 waked up
event 3 signaling
event 2 signaling
event 1 signaling
event 1 could not close
event 2 could not close
event 3 could not close"

I will try to use strace utility.

Thanks,

newcat

newcat 05-31-2004 06:24 PM
I used strace and find out that:

sys_eventopen works fine.

"open("etc/ld.so.preload",O_READONLY)=-1 ENOENT (No such file or directory)"

sys_eventwait and sys_eventsig are not even called.

sys_eventclose gets error:

"SYS_260(ox2, 0x40032280, 0, 0x40015360, 0x80487a0) = -1
ENOSYS(Function not implemented)"

infamous41md 05-31-2004 08:06 PM
i donno.. maybe there is an upper limit on # of system calls? im going to mess /w this tonight,. u read this: http://www.uni-tuebingen.de/zdv/proj...tion2_6_4.html

newcat 05-31-2004 09:36 PM
The system calls in sys.c and main should be sys_evntopen, sys_evntclose, sys_evntwait and sys_evntsig rather than sys_eventopen, sys_eventclose, sys_eventwait and sys_eventsig. I posted earlier by mistake.

Also, here is the strace log in case you might want to have a look:

a. strace log with -c option:

execve("./a.out", ["./a.out"], [/* 33 vars */]) = 0
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
38.62 0.000509 85 6 write
23.14 0.000305 102 3 SYS_259
6.45 0.000085 14 6 clone
5.69 0.000075 11 7 mmap2
4.78 0.000063 16 4 1 open
4.78 0.000063 7 9 old_mmap
3.41 0.000045 8 6 mprotect
3.11 0.000041 3 13 rt_sigprocmask
1.97 0.000026 13 2 munmap
1.52 0.000020 3 7 rt_sigaction
1.44 0.000019 5 4 fstat64
1.37 0.000018 9 2 read
1.21 0.000016 3 5 brk
0.53 0.000007 2 3 close
0.46 0.000006 6 1 uname
0.46 0.000006 1 6 nanosleep
0.38 0.000005 5 1 set_thread_area
0.38 0.000005 2 3 3 SYS_260
0.15 0.000002 2 1 getrlimit
0.15 0.000002 2 1 set_tid_address
------ ----------- ----------- --------- --------- ----------------
100.00 0.001318 90 4 total

b. strace log with no option:

execve("./a.out", ["./a.out"], [/* 33 vars */]) = 0
uname({sys="Linux", node="localhost.localdomain", ...}) = 0
brk(0) = 0x80499cc
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40016000
open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=53695, ...}) = 0
old_mmap(NULL, 53695, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40017000
close(3) = 0
open("/lib/tls/libpthread.so.0", O_RDONLY) = 3
read(3, " \177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\32
0>\0"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=79744, ...}) = 0
old_mmap(NULL, 50040, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40025000
old_mmap(0x4002f000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xa000) = 0x4002f000
old_mmap(0x40030000, 4984, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40030000
close(3) = 0
open("/lib/tls/libc.so.6", O_RDONLY) = 3
read(3, " \177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0`V\
1B4\0"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1531064, ...}) = 0
old_mmap(0x42000000, 1257224, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x42000000
old_mmap(0x4212e000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x12e000) = 0x4212e000
old_mmap(0x42131000, 7944, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x42131000
close(3) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40032000
set_thread_area({entry_number:-1 -> 6, base_addr:0x40032280, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
munmap(0x40017000, 53695) = 0
set_tid_address(0x400322c8) = 3572
rt_sigaction(SIGRTMIN, {0x40028e30, [], SA_RESTORER, 0x4002e618}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN], NULL, 8) = 0
getrlimit(0x3, 0xbfffde84) = 0
SYS_259(0, 0x42015554, 0x40032468, 0x40015360, 0x80487a0) = 1
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40017000
write(1, "event 1 opened\n", 15) = 15
SYS_259(0, 0x40032280, 0xf, 0x40015360, 0x80487a0) = 2
write(1, "event 2 opened\n", 15) = 15
SYS_259(0, 0x40032280, 0xf, 0x40015360, 0x80487a0) = 3
write(1, "event 3 opened\n", 15) = 15
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40033000
brk(0) = 0x80499cc
brk(0x804a9cc) = 0x804a9cc
brk(0) = 0x804a9cc
brk(0x804b000) = 0x804b000
mprotect(0x40033000, 4096, PROT_NONE) = 0
clone(child_stack=0x408328d0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|
CLONE_THREAD|CLONE_SETTLS|CLONE_PARENT_SETTID|CLON
E_CHILD_CLEARTID|CLONE_DETACHED, [3573], {entry_number:6, base_addr:0x40832cc0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 3573
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, {2, 0}) = 0
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40833000
mprotect(0x40833000, 4096, PROT_NONE) = 0
clone(child_stack=0x41032850, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|
CLONE_THREAD|CLONE_SETTLS|CLONE_PARENT_SETTID|CLON
E_CHILD_CLEARTID|CLONE_DETACHED, [3574], {entry_number:6, base_addr:0x41032c40, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 3574
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, {2, 0}) = 0
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x41033000
mprotect(0x41033000, 4096, PROT_NONE) = 0
clone(child_stack=0x418327d0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|
CLONE_THREAD|CLONE_SETTLS|CLONE_PARENT_SETTID|CLON
E_CHILD_CLEARTID|CLONE_DETACHED, [3575], {entry_number:6, base_addr:0x41832bc0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 3575
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, {2, 0}) = 0
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x42133000
mprotect(0x42133000, 4096, PROT_NONE) = 0
clone(child_stack=0x42932750, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|
CLONE_THREAD|CLONE_SETTLS|CLONE_PARENT_SETTID|CLON
E_CHILD_CLEARTID|CLONE_DETACHED, [3576], {entry_number:6, base_addr:0x42932b40, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 3576
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, {2, 0}) = 0
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x42933000
mprotect(0x42933000, 4096, PROT_NONE) = 0
clone(child_stack=0x431326d0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|
CLONE_THREAD|CLONE_SETTLS|CLONE_PARENT_SETTID|CLON
E_CHILD_CLEARTID|CLONE_DETACHED, [3577], {entry_number:6, base_addr:0x43132ac0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 3577
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, {2, 0}) = 0
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x43133000
mprotect(0x43133000, 4096, PROT_NONE) = 0
clone(child_stack=0x43932650, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|
CLONE_THREAD|CLONE_SETTLS|CLONE_PARENT_SETTID|CLON
E_CHILD_CLEARTID|CLONE_DETACHED, [3578], {entry_number:6, base_addr:0x43932a40, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 3578
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, {2, 0}) = 0
SYS_260(0x1, 0x40032280, 0, 0x40015360, 0x80487a0) = -1 ENOSYS (Function not implemented)
write(1, "event 1 could not close\n", 24) = 24
SYS_260(0x2, 0x40032280, 0x18, 0x40015360, 0x80487a0) = -1 ENOSYS (Function not implemented)
write(1, "event 2 could not close\n", 24) = 24
SYS_260(0x3, 0x40032280, 0x18, 0x40015360, 0x80487a0) = -1 ENOSYS (Function not implemented)
write(1, "event 3 could not close\n", 24) = 24
munmap(0x40017000, 4096) = 0
exit_group(0) = ?

thanks,

infamous41md 05-31-2004 11:08 PM
Quote:
Originally posted by newcat

SYS_260(0x1, 0x40032280, 0, 0x40015360, 0x80487a0) = -1 ENOSYS (Function not implemented)
AHA! i think i figured it out:
u need to redefine this define to higher number
Code:
#ifndef NR_syscalls
#define NR_syscalls 256
#else

ENTRY(system_call)
    pushl %eax          # save orig_eax
    SAVE_ALL
    GET_CURRENT(%ebx)
    testb $0x02,tsk_ptrace(%ebx)    # PT_TRACESYS
    jne tracesys
    cmpl $(NR_syscalls),%eax
    jae badsys     
...

badsys:
    movl $-ENOSYS,EAX(%esp)
    jmp ret_from_sys_call
doncha jus love strace, it knows all :D

infamous41md 05-31-2004 11:12 PM
and i think that originally constant is defined here:
/include/linux/sys.h , but just to be sure u should change it in both files.

newcat 06-01-2004 01:11 AM
Infamous41md,

You are so great!!!

I changed the constant in /include/linux/sys.h and it works now!!!

The messages in /var/log/messages show that all of the 4 system calls were called. But I don't understand why strace.log only show that sys_evntopen (SYS_259) and sys_evntclose(SYS_260) were called.

Here is the new strace log:

execve("./a.out", ["./a.out"], [/* 33 vars */]) = 0
uname({sys="Linux", node="localhost.localdomain", ...}) = 0
brk(0) = 0x80499cc
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40016000
open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=53695, ...}) = 0
old_mmap(NULL, 53695, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40017000
close(3) = 0
open("/lib/tls/libpthread.so.0", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\320>\0"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=79744, ...}) = 0
old_mmap(NULL, 50040, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40025000
old_mmap(0x4002f000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xa000) = 0x4002f000
old_mmap(0x40030000, 4984, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40030000
close(3) = 0
open("/lib/tls/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0`V\1B4\0"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1531064, ...}) = 0
old_mmap(0x42000000, 1257224, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x42000000
old_mmap(0x4212e000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x12e000) = 0x4212e000
old_mmap(0x42131000, 7944, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x42131000
close(3) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40032000
set_thread_area({entry_number:-1 -> 6, base_addr:0x40032280, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
munmap(0x40017000, 53695) = 0
set_tid_address(0x400322c8) = 3575
rt_sigaction(SIGRTMIN, {0x40028e30, [], SA_RESTORER, 0x4002e618}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN], NULL, 8) = 0
getrlimit(0x3, 0xbfffe484) = 0
SYS_259(0, 0x42015554, 0x40032468, 0x40015360, 0x80487a0) = 1
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40017000
write(1, "event 1 opened\n", 15) = 15
SYS_259(0, 0x40032280, 0xf, 0x40015360, 0x80487a0) = 2
write(1, "event 2 opened\n", 15) = 15
SYS_259(0, 0x40032280, 0xf, 0x40015360, 0x80487a0) = 3
write(1, "event 3 opened\n", 15) = 15
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40033000
brk(0) = 0x80499cc
brk(0x804a9cc) = 0x804a9cc
brk(0) = 0x804a9cc
brk(0x804b000) = 0x804b000
mprotect(0x40033000, 4096, PROT_NONE) = 0
clone(child_stack=0x408328d0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SETTLS|CLONE_PARENT_SETTID|CLON E_CHILD_CLEARTID|CLONE_DETACHED, [3576], {entry_number:6, base_addr:0x40832cc0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 3576
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, {2, 0}) = 0
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40833000
mprotect(0x40833000, 4096, PROT_NONE) = 0
clone(child_stack=0x41032850, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SETTLS|CLONE_PARENT_SETTID|CLON E_CHILD_CLEARTID|CLONE_DETACHED, [3577], {entry_number:6, base_addr:0x41032c40, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 3577
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, {2, 0}) = 0
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x41033000
mprotect(0x41033000, 4096, PROT_NONE) = 0
clone(child_stack=0x418327d0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SETTLS|CLONE_PARENT_SETTID|CLON E_CHILD_CLEARTID|CLONE_DETACHED, [3578], {entry_number:6, base_addr:0x41832bc0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 3578
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, {2, 0}) = 0
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x42133000
mprotect(0x42133000, 4096, PROT_NONE) = 0
clone(child_stack=0x42932750, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SETTLS|CLONE_PARENT_SETTID|CLON E_CHILD_CLEARTID|CLONE_DETACHED, [3579], {entry_number:6, base_addr:0x42932b40, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 3579
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, {2, 0}) = 0
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x42933000
mprotect(0x42933000, 4096, PROT_NONE) = 0
clone(child_stack=0x431326d0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SETTLS|CLONE_PARENT_SETTID|CLON E_CHILD_CLEARTID|CLONE_DETACHED, [3580], {entry_number:6, base_addr:0x43132ac0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 3580
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, {2, 0}) = 0
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x43133000
mprotect(0x43133000, 4096, PROT_NONE) = 0
clone(child_stack=0x43932650, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SETTLS|CLONE_PARENT_SETTID|CLON E_CHILD_CLEARTID|CLONE_DETACHED, [3581], {entry_number:6, base_addr:0x43932a40, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 3581
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, {2, 0}) = 0
SYS_260(0x1, 0x40032280, 0, 0x40015360, 0x80487a0) = 0
write(1, "event 1 closed\n", 15) = 15
SYS_260(0x2, 0x40032280, 0xf, 0x40015360, 0x80487a0) = 0
write(1, "event 2 closed\n", 15) = 15
SYS_260(0x3, 0x40032280, 0xf, 0x40015360, 0x80487a0) = 0
write(1, "event 3 closed\n", 15) = 15
munmap(0x40017000, 4096) = 0
exit_group(0) = ?

infamous41md 06-01-2004 01:00 PM
aweseome! i still haven't been able to try this myself yet b/c i've had a project im working on for $$, but i can't wait once im done :D as to problem, i donno, but it doesnt look like ur threads are even running, does it? i dont see the printf(..) in your threads output??

newcat 06-01-2004 02:04 PM
The strange thing is though the threads were not shown in the strace log, they were shown both in the program output and messages file:

program output:

[root@localhost project1]# gcc -I/usr/src/linux-2.4.20-8/include test.c -lpthread
[root@localhost project1]# strace -o strace2.log ./a.out
event 1 opened
event 2 opened
event 3 opened
event 1 waiting
event 2 waiting
event 3 waiting
event 3 signaling
event 3 waked up
event 2 signaling
event 2 waked up
event 1 signaling
event 1 waked up
event 1 closed
event 2 closed
event 3 closed

[root@localhost project1]#cd /var/log
[root@localhost log]# more messages
...
May 31 22:10:23 localhost kernel:sys_evntopen
May 31 22:10:23 localhost last message repeated 2 times
May 31 22:10:23 localhost kernel:sys_evntwait
May 31 22:10:27 localhost last message repeated 2 times
May 31 22:10:29 localhost kernel:sys_evntsig
May 31 22:10:33 localhost last message repeated 2 times
May 31 22:10:35 localhost kernel:sys_evntclose
May 31 22:10:39 localhost last message repeated 2 times


I must leave to show my professor the work. ^-^ Let me know once you figure the problem out.

Thanks,

infamous41md 06-01-2004 03:20 PM
check out strace man page, optins for following child/threads. 'strace -f' of mine.

newcat 06-02-2004 02:02 AM
Ya, you are right. Thank you for your help. Now I have time to play some kpoker. ^-^


All times are GMT -5. The time now is 04:55 PM.
Page 1 of 2 1 2
Show 50 post(s) from this thread on one page