usr/src/cmd/rcap/common/rcapd_stat.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <fcntl.h>
  32 #include <stdio.h>
  33 #include <unistd.h>
  34 #include "rcapd_stat.h"
  35
  36 /*
  37  * Return the pid of the writer of the statistics file.
  38  */
  39 pid_t
  40 stat_get_rcapd_pid(char *file)
  41 {
  42         int fd;
  43         rcapd_stat_hdr_t hdr;
  44         char procfile[20];
  45         struct stat st;
  46
  47         if ((fd = open(file, O_RDONLY)) < 0)
  48                 return (-1);
  49
  50         if (read(fd, &hdr, sizeof (hdr)) != sizeof (hdr)) {
  51                 (void) close(fd);
  52                 return (-1);
  53         }
  54         (void) close(fd);
  55
  56         (void) snprintf(procfile, 20, "/proc/%d/psinfo", (int)hdr.rs_pid);
  57         if (stat(procfile, &st) == 0)
  58                 return (hdr.rs_pid);
  59         else
  60                 return (-1);
  61 }