[Bug other/55070] New: pthread_getname_np returns the name with a terminating newline on Linux.

[chandan.jc at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55070

             Bug #: 55070
           Summary: pthread_getname_np returns the name with a terminating
                    newline on Linux.
    Classification: Unclassified
           Product: gcc
           Version: 4.5.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: chandan.jc@gmail.com


pthread_getname_np returns the name with a terminating newline.


Steps to reproduce:

Run the following program on Ubuntu 11.04 (should be reproducible on any
version). 

#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

void *threadfunc(void *parm)
{
    printf("In the thread.\n");
    sleep(20); // allow main program to set the thread name
    return NULL;
}

int main(int argc, char **argv)
{
    pthread_t thread;
    int rc=0;
    char theName[16];

    memset(theName, 0, sizeof(theName));
    printf("Creating an unnamed thread\n");
    rc = pthread_create(&thread, NULL, threadfunc, NULL);
    if(0 == rc)
    {
        sleep(2);
        rc = pthread_setname_np(thread, "THREADFOO");
        sleep(2);
        if(0 == rc)
        {
            rc = pthread_getname_np(thread, theName, 16);
            if(0 == rc)
            {
                printf("The thread name is %s.\n", theName);
            }
            else
            {
                perror("pthread_getname_np");
            }
        }
        else
        {
            perror("pthread_setname_np");
        }
        rc = pthread_join(thread, NULL);
    }
    if(0 != rc)
    {
        perror("pthread_create");
    }
    printf("Done\n");
    return(rc);
}


Expected output:
Creating an unnamed thread
In the thread.
The thread name is THREADFOO.
Done

Actual Output:
Creating an unnamed thread
In the thread.
The thread name is THREADFOO
.
Done

As you can see, pthread_getname_np is adding a trailing newline to the returned
string.