[android-developers] Re: a simple native pthread test but SIGSEGV generated!
i found the reason why SIGSEGV is generated
i didnt call exit(0) in the end
thanks
On Nov 17, 10:04 pm, David Turner [EMAIL PROTECTED] wrote:
You are using arm-none-linux-gnueabi-gcc which is not compatible with the
android toolchain.
This kind of issue is perfectly normal and non supported.
Only trivial programs may correctly work that way, more by chance that
anything else.
On Mon, Nov 17, 2008 at 1:35 PM, allstars [EMAIL PROTECTED] wrote:
hello world
i try to do a simple pthread test on android (natively)
/*START OF CODE ===*/
#include stdio.h
#include sys/types.h
#include pthread.h
void *hello(void *arg)
{
printf(Hello from node %d\n, *(int *)arg);
}
int main(int argc, char* argv[])
{
int n,i;
pthread_t threads[2];
n = 2;
/* Start up thread */
for (i = 0; i n; i++)
{
pthread_create(threads[i], NULL, hello, (void *)i);
}
/* Synchronize the completion of each thread. */
for (i = 0; i n; i++)
{
pthread_join(threads[i],NULL);
}
printf(pthread_test returns \n);
return 0;
}
/*===END OF CODE=*/
then i compile it (pthread.c)
$arm-none-linux-gnueabi-gcc -c -g pthread.c
$arm-none-linux-gnueabi-ld --entry=main --dynamic-linker /system/bin/
linker -nostdlib -rpath /system/lib -rpath system/lib -L system/lib -
lc -o pthread_test pthread.o
./system is the directory of system image
but in pthread_join , SIGSEGV will be generated
i use strace to debug this
# ./strace ./pthread_test
execve(./pthread_test, [./pthread_test], [/* 10 vars */]) = 0
getpid() = 189
syscall_983045(0xb00169c4, 0x4990, 0xb0011030, 0, 0x1, 0xbecf6d94,
0xbecf6d9c, 0xf0005, 0, 0, 0, 0, 0, 0xbecf6d60, 0xbdcd,
0xb00015ac, 0x8010, 0xb00169c4, 0, 0, 0, 0xeb48, 0xcd1f8, 0xcd1d0,
0, 0, 0, 0, 0, 0, 0, 0) = 0
gettid() = 189
sigaction(SIGILL, {0xb0001211, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGABRT, {0xb0001211, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGBUS, {0xb0001211, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGFPE, {0xb0001211, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGSEGV, {0xb0001211, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGSTKFLT, {0xb0001211, [], SA_RESTART}, {SIG_DFL}, 0) = 0
open(libc.so, O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or
directory)
open(/system/lib/libc.so, O_RDONLY|O_LARGEFILE) = 3
lseek(3, 0, SEEK_SET) = 0
read(3, \177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0`
\225\0\000..., 4096) = 4096
lseek(3, -8, SEEK_END) = 227472
read(3, \0\0\340\257PRE , 8) = 8
mmap2(0xafe0, 274432, PROT_READ|PROT_EXEC, MAP_PRIVATE|
MAP_ANONYMOUS, -1, 0) = 0xafe0
mmap2(0xafe0, 214032, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED,
3, 0) = 0xafe0
mprotect(0xafe0, 217088, PROT_READ|PROT_WRITE|PROT_EXEC) = 0
mmap2(0xafe35000, 8420, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED,
3, 0x35) = 0xafe35000
mmap2(0xafe38000, 41760, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
MAP_ANONYMOUS, -1, 0) = 0xafe38000
close(3) = 0
mprotect(0xafe0, 217088, PROT_READ|PROT_EXEC) = 0
getuid32() = 0
geteuid32() = 0
open(/dev/urandom, O_RDONLY|O_LARGEFILE) = 3
read(3, %\374\353\364, 4) = 4
close(3) = 0
mprotect(0x8000, 4096, PROT_READ|PROT_EXEC) = 0
getuid32() = 0
geteuid32() = 0
brk(0) = 0x11000
brk(0x11000) = 0x11000
brk(0x12000) = 0x12000
mmap2(0x1000, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|
MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = 0x1000
mprotect(0x1000, 4096, PROT_NONE) = 0
clone(child_stack=0x100fff00, flags=CLONE_VM|CLONE_FS|CLONE_FILES|
CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_DETACHED) = 190
futex(0x100fff00, FUTEX_WAKE, 1Hello from node 0
) = 1
mmap2(0x1000, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|
MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = 0x1000
mprotect(0x1000, 4096, PROT_NONE) = 0
clone(child_stack=0x100fff00, flags=CLONE_VM|CLONE_FS|CLONE_FILES|
CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_DETACHED) = 191
futex(0x100fff00, FUTEX_WAKE, 1Hello from node 1
) = 1
--- SIGSEGV (Segmentation fault) @ 0 (4) ---
sigaction(SIGUSR1, {SIG_IGN}, {SIG_DFL}, 0) = 0
gettid() = 189
SYS_281(0x1, 0x1, 0, 0xe52c, 0xb000f55c) = 3
SYS_283(0x3, 0xbecf69b6, 0x14, 0x1, 0x3) = 0
write(3, \275\0\0\0, 4) = 4
read(3, 0xbecf6a54, 1) = ? ERESTARTSYS (To be
[android-developers] Re: a simple native pthread test but SIGSEGV generated!
You are using arm-none-linux-gnueabi-gcc which is not compatible with the
android toolchain.
This kind of issue is perfectly normal and non supported.
Only trivial programs may correctly work that way, more by chance that
anything else.
On Mon, Nov 17, 2008 at 1:35 PM, allstars [EMAIL PROTECTED] wrote:
hello world
i try to do a simple pthread test on android (natively)
/*START OF CODE ===*/
#include stdio.h
#include sys/types.h
#include pthread.h
void *hello(void *arg)
{
printf(Hello from node %d\n, *(int *)arg);
}
int main(int argc, char* argv[])
{
int n,i;
pthread_t threads[2];
n = 2;
/* Start up thread */
for (i = 0; i n; i++)
{
pthread_create(threads[i], NULL, hello, (void *)i);
}
/* Synchronize the completion of each thread. */
for (i = 0; i n; i++)
{
pthread_join(threads[i],NULL);
}
printf(pthread_test returns \n);
return 0;
}
/*===END OF CODE=*/
then i compile it (pthread.c)
$arm-none-linux-gnueabi-gcc -c -g pthread.c
$arm-none-linux-gnueabi-ld --entry=main --dynamic-linker /system/bin/
linker -nostdlib -rpath /system/lib -rpath system/lib -L system/lib -
lc -o pthread_test pthread.o
./system is the directory of system image
but in pthread_join , SIGSEGV will be generated
i use strace to debug this
# ./strace ./pthread_test
execve(./pthread_test, [./pthread_test], [/* 10 vars */]) = 0
getpid()= 189
syscall_983045(0xb00169c4, 0x4990, 0xb0011030, 0, 0x1, 0xbecf6d94,
0xbecf6d9c, 0xf0005, 0, 0, 0, 0, 0, 0xbecf6d60, 0xbdcd,
0xb00015ac, 0x8010, 0xb00169c4, 0, 0, 0, 0xeb48, 0xcd1f8, 0xcd1d0,
0, 0, 0, 0, 0, 0, 0, 0) = 0
gettid()= 189
sigaction(SIGILL, {0xb0001211, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGABRT, {0xb0001211, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGBUS, {0xb0001211, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGFPE, {0xb0001211, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGSEGV, {0xb0001211, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGSTKFLT, {0xb0001211, [], SA_RESTART}, {SIG_DFL}, 0) = 0
open(libc.so, O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or
directory)
open(/system/lib/libc.so, O_RDONLY|O_LARGEFILE) = 3
lseek(3, 0, SEEK_SET) = 0
read(3, \177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0`
\225\0\000..., 4096) = 4096
lseek(3, -8, SEEK_END) = 227472
read(3, \0\0\340\257PRE , 8) = 8
mmap2(0xafe0, 274432, PROT_READ|PROT_EXEC, MAP_PRIVATE|
MAP_ANONYMOUS, -1, 0) = 0xafe0
mmap2(0xafe0, 214032, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED,
3, 0) = 0xafe0
mprotect(0xafe0, 217088, PROT_READ|PROT_WRITE|PROT_EXEC) = 0
mmap2(0xafe35000, 8420, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED,
3, 0x35) = 0xafe35000
mmap2(0xafe38000, 41760, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
MAP_ANONYMOUS, -1, 0) = 0xafe38000
close(3)= 0
mprotect(0xafe0, 217088, PROT_READ|PROT_EXEC) = 0
getuid32() = 0
geteuid32() = 0
open(/dev/urandom, O_RDONLY|O_LARGEFILE) = 3
read(3, %\374\353\364, 4) = 4
close(3)= 0
mprotect(0x8000, 4096, PROT_READ|PROT_EXEC) = 0
getuid32() = 0
geteuid32() = 0
brk(0) = 0x11000
brk(0x11000)= 0x11000
brk(0x12000)= 0x12000
mmap2(0x1000, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|
MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = 0x1000
mprotect(0x1000, 4096, PROT_NONE) = 0
clone(child_stack=0x100fff00, flags=CLONE_VM|CLONE_FS|CLONE_FILES|
CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_DETACHED) = 190
futex(0x100fff00, FUTEX_WAKE, 1Hello from node 0
)= 1
mmap2(0x1000, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|
MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = 0x1000
mprotect(0x1000, 4096, PROT_NONE) = 0
clone(child_stack=0x100fff00, flags=CLONE_VM|CLONE_FS|CLONE_FILES|
CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_DETACHED) = 191
futex(0x100fff00, FUTEX_WAKE, 1Hello from node 1
)= 1
--- SIGSEGV (Segmentation fault) @ 0 (4) ---
sigaction(SIGUSR1, {SIG_IGN}, {SIG_DFL}, 0) = 0
gettid()= 189
SYS_281(0x1, 0x1, 0, 0xe52c, 0xb000f55c) = 3
SYS_283(0x3, 0xbecf69b6, 0x14, 0x1, 0x3) = 0
write(3, \275\0\0\0, 4) = 4
read(3, 0xbecf6a54, 1) = ? ERESTARTSYS (To be
restarted)
--- SIGCONT (Continued) @ 0 (0) ---
read(3, , 1) = 0
close(3)= 0
sigaction(SIGSEGV, {SIG_IGN}, {0xb0001211, [], SA_RESTART}, 0) = 0
sigreturn() = ? (mask now
