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/*
* common - common nodm definitions and utility functions
*
* Copyright 2011 Enrico Zini <enrico@enricozini.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "common.h"
#include "log.h"
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <errno.h>
const char* nodm_basename (const char* str)
{
const char *cp = strrchr (str, '/');
return cp ? cp + 1 : str;
}
const char* getenv_with_default(const char* envname, const char* def)
{
const char* res = getenv(envname);
if (res != NULL)
return res;
else
return def;
}
const char* nodm_strerror(int code)
{
switch (code)
{
case E_SUCCESS: return "success";
case E_NOPERM: return "permission denied";
case E_USAGE: return "invalid command syntax";
case E_BAD_ARG: return "invalid argument to option";
case E_PASSWD_NOTFOUND: return "not found password file";
case E_SHADOW_NOTFOUND: return "not found shadow password file";
case E_GROUP_NOTFOUND: return "not found group file";
case E_GSHADOW_NOTFOUND: return "not found shadow group file";
case E_CMD_NOEXEC: return "can't run command/shell";
case E_CMD_NOTFOUND: return "can't find command/shell to run";
case E_PROGRAMMING: return "programming error";
case E_PAM_ERROR: return "something wrong talking with PAM";
case E_OS_ERROR: return "something wrong talking with the Operating System";
case E_XLIB_ERROR: return "Xlib error";
case E_X_SERVER_DIED: return "server died";
case E_X_SERVER_TIMEOUT: return "server not ready before timeout";
case E_X_SERVER_CONNECT: return "could not connect to X server";
case E_SESSION_DIED: return "X session died";
case E_USER_QUIT: return "quit requested";
default: return "unknown error";
}
}
int child_has_quit(pid_t pid, int* quit, int* status)
{
pid_t res = waitpid(pid, status, WNOHANG);
if (res == -1)
{
if (errno == ECHILD)
*quit = 2;
else
{
log_err("error checking status of child process %d: %m", (int)pid);
return E_OS_ERROR;
}
} else if (res == 0)
*quit = 0;
else
*quit = 1;
return E_SUCCESS;
}
int child_must_exit(pid_t pid, const char* procdesc)
{
int res = E_SUCCESS;
if (pid > 0)
{
// Check what is the child status
int quit, status;
res = child_has_quit(pid, &quit, &status);
if (res != E_SUCCESS) return res;
switch (quit)
{
case 0:
// still running, we must kill it
log_info("sending %s %d the TERM signal", procdesc, (int)pid);
kill(pid, SIGTERM);
kill(pid, SIGCONT);
while (true)
{
int status;
if (waitpid(pid, &status, 0) == -1)
{
if (errno == EINTR)
continue;
if (errno != ECHILD)
return E_OS_ERROR;
}
break;
}
break;
case 1:
// has just quit
log_info("%s %d quit with status %d", procdesc, (int)pid, status);
break;
case 2:
// Was not there
break;
}
}
return E_SUCCESS;
}
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