5602dd04e1
This commit will resolve the RedHat Bugzilla #1322111. [ import from identical commit against master branch ] [ but without trailing whitespace, thank you so much ] Imported by: Jim Warner <james.warner@comcast.net>
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/*
|
|
* wchan.c - kernel symbol handling
|
|
* Copyright 1998-2003 by Albert Cahalan
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include "wchan.h" // to verify prototype
|
|
|
|
|
|
const char * lookup_wchan (int pid) {
|
|
static char buf[64];
|
|
const char *ret = buf;
|
|
ssize_t num;
|
|
int fd;
|
|
|
|
snprintf(buf, sizeof buf, "/proc/%d/wchan", pid);
|
|
fd = open(buf, O_RDONLY);
|
|
if (fd==-1) return "?";
|
|
|
|
num = read(fd, buf, sizeof buf - 1);
|
|
close(fd);
|
|
|
|
if (num<1) return "?"; // allow for "0"
|
|
buf[num] = '\0';
|
|
|
|
if (buf[0]=='0' && buf[1]=='\0') return "-";
|
|
|
|
// lame ppc64 has a '.' in front of every name
|
|
if (*ret=='.') ret++;
|
|
while(*ret=='_') ret++;
|
|
|
|
return ret;
|
|
}
|