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/*
Copyright (C) (2004 - 2006) (Venkata Ramana Enaganti) <ramana@intraperson.com>
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "msg.h"
#include "backup_argv.h"
#include "miscfuncs.h"
#include "backup_fork.h"
/*default is to give low priority*/
#define DFLT_PRI 30
#define PRIORITY_MAX 1
#define PRIORITY_MIN 40
static int priority;
static void reset_signals( void )
{
sigset_t set;
sigfillset( &set );
if( sigprocmask( SIG_UNBLOCK, &set, NULL ) )
msglog( MSG_ERR | LOG_ERRNO, "reset_signals: sigprocmask" );
}
/* to be called only from forked child process*/
static void backup_exec( const char *name, const char *path )
{
char **argv;
reset_signals();
setpriority( PRIO_PROCESS, 0, priority );
if( ! backup_argv_get( name, path, &argv ) )
{
fprintf( stderr, "backup_exec: " \
"could not make argument vector" );
_exit( EXIT_FAILURE );
}
if( execv( argv[0], argv ) )
{
fprintf( stderr, "backup_exec: execv: %s", strerror( errno ) );
_exit( EXIT_FAILURE );
}
_exit( EXIT_FAILURE );
}
pid_t backup_fork_new( const char *name, const char *path )
{
pid_t pid;
msglog( MSG_INFO, "starting backup for %s", name );
pid = fork();
if( pid < 0 )
{
msglog( MSG_NOTICE|LOG_ERRNO, "fork: could not start " \
"backup for %s", name );
return -1;
}
else if( pid == 0 )
{
if( setpgrp() == -1 )
fprintf( stderr, "setpgrp: %s", strerror( errno ) );
backup_exec( name, path );
}
else
setpgid( pid, pid );
return pid;
}
int backup_waitpid(pid_t pid, const char *name, int block)
{
int status;
int options = block ? 0 : WNOHANG;
int wrv;
again:
wrv = waitpid( pid, &status, options );
if( wrv == -1 && errno == EINTR )
{
msglog( MSG_ERR, "waitpid: EINTR received. trying again...");
sleep( 1 );
goto again;
}
if( wrv == -1 )
{
msglog( MSG_ERR|LOG_ERRNO, "waitpid %ld for %s",
(long) pid, name );
return 1;
}
else if( ! wrv )
{
return 0;
}
else if( wrv > 0 )
{
if( WIFEXITED( status ) )
{
msglog( MSG_INFO,
"backup process %ld for %s exited with %d",
(long) pid, name, WEXITSTATUS( status ) );
}
else if( WIFSIGNALED( status ) )
{
msglog( MSG_INFO, "backup process %ld for %s " \
"caught signal %d", (long) pid,
name, WTERMSIG( status ) );
}
else
{
/*should not get here*/
msglog( MSG_NOTICE,
"backup process %ld for %s stopped",
(long) pid, name );
goto again;
}
}
return 1;
}
void backup_soft_signal( pid_t pid )
{
kill( - pid, SIGTERM );
}
void backup_fast_kill( pid_t pid, const char *name )
{
kill( - pid, SIGKILL );
backup_waitpid( pid, name, 1 );
}
void backup_kill( pid_t pid, const char *name )
{
int i;
if( backup_waitpid( pid, name, 0 ) != 0 )
return;
/*send soft signal first and wait for some time*/
kill( - pid, SIGTERM );
sleep( 1 );
if( backup_waitpid( pid, name, 0 ) != 0 )
return;
for( i = 0; i < 3; i++ )
{
kill( - pid, SIGKILL );
sleep( 1 );
if( backup_waitpid( pid, name, 0 ) != 0 )
return;
}
backup_waitpid( pid, name, 1 );
}
/**********command line option handling funtions***************/
void backup_fork_option_pri( char ch, char *arg, int valid )
{
int pri;
if( ! valid ) priority = DFLT_PRI;
else if( ! string_to_number( arg, &pri ) )
msglog( MSG_FATAL, "invalid argument for -%c", ch );
else if( pri < PRIORITY_MAX || pri > PRIORITY_MIN )
msglog( MSG_FATAL, "invalid priority %d for -%c", pri, ch );
else priority = pri - 21; /*change to -20 to +20 range*/
}
#ifdef TEST
char *autodir_name(void)
{
return "test autodir";
}
int main(void)
{
pid_t pid;
msg_option_verbose('x', "", 1);
msg_init();
msg_console_on();
backup_argv_init( strdup( "/home/devel/testautodir/backup" ) );
while (1)
{
pid = backup_fork_new( "test", "/tmp" );
if( pid > 0 )
{
backup_kill( pid, "test" );
}
}
}
#endif
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