128 lines
2.5 KiB
C
128 lines
2.5 KiB
C
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/* -*- Mode: C ; indent-tabs-mode: t ; tab-width: 8 ; c-basic-offset: 8 -*- */
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/*
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* LASH
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*
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* Copyright (C) 2009 Nedko Arnaudov <nedko@arnaudov.name>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <assert.h>
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#include "procfs.h"
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#include "common/debug.h"
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static char g_buffer[4096];
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static
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char *
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procfs_get_process_file(
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unsigned long long pid,
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const char * filename)
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{
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int fd;
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ssize_t ret;
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size_t max;
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char * buffer_ptr;
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sprintf(g_buffer, "/proc/%llu/%s", pid, filename);
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fd = open(g_buffer, O_RDONLY);
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if (fd == -1)
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{
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return NULL;
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}
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buffer_ptr = g_buffer;
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do
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{
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max = sizeof(g_buffer) - (buffer_ptr - g_buffer);
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ret = read(fd, buffer_ptr, max);
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buffer_ptr += ret;
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}
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while (ret > 0);
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if (ret == 0)
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{
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buffer_ptr = strdup(g_buffer);
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lash_debug("process %llu %s is \"%s\"", pid, filename, buffer_ptr);
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}
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else
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{
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assert(ret == -1);
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buffer_ptr = NULL;
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}
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close(fd);
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return buffer_ptr;
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}
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static
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char *
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procfs_get_process_link(
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unsigned long long pid,
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const char * filename)
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{
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int fd;
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ssize_t ret;
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char * buffer_ptr;
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sprintf(g_buffer, "/proc/%llu/%s", pid, filename);
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fd = open(g_buffer, O_RDONLY);
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if (fd == -1)
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{
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return NULL;
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}
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ret = readlink(g_buffer, g_buffer, sizeof(g_buffer));
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if (ret != 0)
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{
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g_buffer[ret] = 0;
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buffer_ptr = strdup(g_buffer);
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lash_debug("process %llu %s symlink points to \"%s\"", pid, filename, buffer_ptr);
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}
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else
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{
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assert(ret == -1);
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buffer_ptr = NULL;
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}
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close(fd);
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return buffer_ptr;
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}
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char *
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procfs_get_process_cmdline(
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unsigned long long pid)
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{
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return procfs_get_process_file(pid, "cmdline");
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}
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char *
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procfs_get_process_cwd(
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unsigned long long pid)
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{
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return procfs_get_process_link(pid, "cwd");
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}
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