Hi Michael,
I have modified the man page for pthread_setname/getname according to
the comments you gave the last time. Sending the updated copy again.
Please review and let me know if it's fine.
.\" Copyright (C) 2012 Chandan Apsangi <chandan.jc@xxxxxxxxx>
.\"
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.TH PTHREAD_SETNAME_NP 3 2012-10-24 "Linux" "Linux Programmer's Manual"
.SH NAME
pthread_setname_np, pthread_getname_np \- set/get the name of a thread
.SH SYNOPSIS
.nf
.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
.B #include <pthread.h>
.BI "int pthread_setname_np(pthread_t *" thread ", const char *" name ");
.BI "int pthread_getname_np(pthread_t *" thread ", const char *" name
", size_t" len);
.fi
.sp
Compile and link with \fI\-pthread\fP.
.SH DESCRIPTION
By default, all the threads created using
.BR pthread_create (3)
inherit the program name.
Using
.BR pthread_setname_np (3),
users can specify a unique name for a thread,
which can be particularly useful for debugging complicated
multi-threaded applications.
The thread name is a meaningful C language string, whose length is
restricted to 16 characters.
Anything greater than this would lead to an error.
The
.BR pthread_getname_np (3)
can be used to retrieve the name of the thread.
The buffer specified by name must be at least 16 characters in length.
The returned thread name in the output buffer will be null terminated.
.SH RETURN VALUE
On success, these functions return 0;
on error, they return a nonzero error number.
.SH ERRORS
If the functions fail to open /proc/self/task/<TID>/comm, then the
call may fail with one of
the errors described in
.BR open (2).
.TP
.B ERANGE
The length of the string specified as second argument exceeds the allowed limit.
.SH NOTES
.BR pthread_setname_np (3)
internally writes to the thread specific comm file under
.IR /proc
filesystem:
.IR /proc/self/task/<tid>/comm.
.BR pthread_getname_np (3)
retreives it from the same location.
.SH EXAMPLE
.PP
The program below demonstrates the use of
.BR pthread_setname_np (),
as well as
.BR pthread_getname_np ().
The following shell session shows a sample run of the program:
.in +4n
.nf
.RB "$" " ./a.out 1 2 4 7 14"
Created a thread. Default name is: a.out
The thread name after setting it is THREADFOO.
Done
.fi
.in
.SS Program source
\&
.nf
#define _GNU_SOURCE
#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#define NAMELEN 16
#define errExitEN(en, msg) \\
do { if(en) { errno = en; perror(msg); \\
exit(EXIT_FAILURE);} \\
} while (0)
static void *threadfunc(void *parm)
{
sleep(5); // allow main program to set the thread name
return NULL;
}
int main(int argc, char **argv)
{
pthread_t thread;
int rc;
char thread_name[NAMELEN];
rc = pthread_create(&thread, NULL, threadfunc, NULL);
errExitEN(rc, "pthread_create");
rc = pthread_getname_np(thread, thread_name, NAMELEN);
errExitEN(rc, "pthread_getname_np");
printf("Created a thread. Default name is: %s\\n", thread_name);
rc = pthread_setname_np(thread, "THREADFOO");
errExitEN(rc, "pthread_setname_np");
sleep(2);
rc = pthread_getname_np(thread, thread_name, NAMELEN);
errExitEN(rc, "pthread_getname_np");
printf("The thread name after setting it is %s.\\n", thread_name);
rc = pthread_join(thread, NULL);
errExitEN(rc, "pthread_join");
printf("Done\\n");
exit(EXIT_SUCCESS);
}
.fi
.SH SEE ALSO
.ad l
.nh
.BR prctl (2),
.BR pthread_create (3),
.BR pthreads (7)
Thanks,
Chandan
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