On 30 November 2012 10:39, Ajeet Yadav <ajeet.yadav...@gmail.com> wrote:
> Linux version 3.0.33 (Cortex A15)
> Below program crashes with 2.14.1 glibc but runs fine with 2.11.1 glibc.
>
> #include <pthread.h>
> #include <stdio.h>
> #include <stdlib.h>
> #include <signal.h>
> #include <string.h>
> #include <errno.h>
>
> #define MAX_LINE_SIZE 80
>
> #define MAX_THREAD 20
> #define MAX_POPEN 10
> #define MALLOC_SIZE 16
>
> void* pipe_thread(void *arg)
> {
> int i;
> char *p = NULL;
> FILE *fp[MAX_POPEN];
> char shellCommand[MAX_LINE_SIZE];
>
> memset(shellCommand, 0x00, MAX_LINE_SIZE);
> sprintf(shellCommand, "mount");
> signal(SIGPIPE, SIG_IGN);
>
> while (1) {
> for (i = 0; i < MAX_POPEN; ++i) {
> fp[i] = popen(shellCommand, "r");
> }
>
> if (p) {
> free(p);
> }
>
> for (i = 0; i < MAX_POPEN; ++i) {
> if (fp[i])
> pclose(fp[i]);
> }
>
> p = malloc(MALLOC_SIZE);
> if (p)
> memset(p, 0, MALLOC_SIZE);
> }
> return NULL;
> }
>
> int main(int argc, char *argv[])
> {
> int i;
> pthread_t tid;
>
> for (i = 0; i < MAX_THREAD; ++i) {
> pthread_create(&tid, NULL, &pipe_thread, (void*)NULL);
> }
> sleep(60);
> }
On returning from main(), all open streams are closed, but your threads are
still running and might call pclose() on an already closed FILE, which is
not allowed.
--
Mans Rullgard / mru
_______________________________________________
linaro-toolchain mailing list
linaro-toolchain@lists.linaro.org
http://lists.linaro.org/mailman/listinfo/linaro-toolchain
