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/*
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Unix SMB / CIFS implementation .
pidfile handling
Copyright ( C ) Andrew Tridgell 1998
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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
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the Free Software Foundation ; either version 3 of the License , or
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( at your option ) any later version .
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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 .
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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 , see < http : //www.gnu.org/licenses/>.
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*/
# include "includes.h"
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# include "system/filesys.h"
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# include "lib/util/pidfile.h"
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/**
* @ file
* @ brief Pid file handling
*/
/**
* return the pid in a pidfile . return 0 if the process ( or pidfile )
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* does not exist
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*/
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pid_t pidfile_pid ( const char * piddir , const char * name )
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{
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size_t len = strlen ( piddir ) + strlen ( name ) + 6 ;
char pidFile [ len ] ;
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int fd ;
char pidstr [ 20 ] ;
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pid_t ret = - 1 ;
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snprintf ( pidFile , sizeof ( pidFile ) , " %s/%s.pid " , piddir , name ) ;
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fd = open ( pidFile , O_NONBLOCK | O_RDONLY , 0644 ) ;
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if ( fd = = - 1 ) {
return 0 ;
}
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ZERO_STRUCT ( pidstr ) ;
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if ( read ( fd , pidstr , sizeof ( pidstr ) - 1 ) < = 0 ) {
goto noproc ;
}
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ret = ( pid_t ) atoi ( pidstr ) ;
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if ( ret < = 0 ) {
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DEBUG ( 1 , ( " Could not parse contents of pidfile %s \n " ,
pidFile ) ) ;
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goto noproc ;
}
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if ( ! process_exists_by_pid ( ret ) ) {
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DEBUG ( 10 , ( " Process with PID=%d does not exist. \n " , ( int ) ret ) ) ;
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goto noproc ;
}
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if ( fcntl_lock ( fd , F_SETLK , 0 , 1 , F_RDLCK ) ) {
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/* we could get the lock - it can't be a Samba process */
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DEBUG ( 10 , ( " Process with PID=%d is not a Samba process. \n " ,
( int ) ret ) ) ;
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goto noproc ;
}
close ( fd ) ;
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DEBUG ( 10 , ( " Process with PID=%d is running. \n " , ( int ) ret ) ) ;
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return ret ;
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noproc :
close ( fd ) ;
return 0 ;
}
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/**
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* create a pid file in the pid directory . open it and leave it locked
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*/
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void pidfile_create ( const char * piddir , const char * name )
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{
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size_t len = strlen ( piddir ) + strlen ( name ) + 6 ;
char pidFile [ len ] ;
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int fd ;
char buf [ 20 ] ;
pid_t pid ;
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snprintf ( pidFile , sizeof ( pidFile ) , " %s/%s.pid " , piddir , name ) ;
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pid = pidfile_pid ( piddir , name ) ;
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if ( pid ! = 0 ) {
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DEBUG ( 0 , ( " ERROR: %s is already running. File %s exists and process id %d is running. \n " ,
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name , pidFile , ( int ) pid ) ) ;
exit ( 1 ) ;
}
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fd = open ( pidFile , O_NONBLOCK | O_CREAT | O_WRONLY , 0644 ) ;
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if ( fd = = - 1 ) {
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DEBUG ( 0 , ( " ERROR: can't open %s: Error was %s \n " , pidFile ,
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strerror ( errno ) ) ) ;
exit ( 1 ) ;
}
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smb_set_close_on_exec ( fd ) ;
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if ( fcntl_lock ( fd , F_SETLK , 0 , 1 , F_WRLCK ) = = false ) {
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DEBUG ( 0 , ( " ERROR: %s : fcntl lock of file %s failed. Error was %s \n " ,
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name , pidFile , strerror ( errno ) ) ) ;
exit ( 1 ) ;
}
memset ( buf , 0 , sizeof ( buf ) ) ;
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slprintf ( buf , sizeof ( buf ) - 1 , " %u \n " , ( unsigned int ) getpid ( ) ) ;
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if ( write ( fd , buf , strlen ( buf ) ) ! = ( ssize_t ) strlen ( buf ) ) {
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DEBUG ( 0 , ( " ERROR: can't write to file %s: %s \n " ,
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pidFile , strerror ( errno ) ) ) ;
exit ( 1 ) ;
}
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/* Leave pid file open & locked for the duration... */
}
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void pidfile_unlink ( const char * piddir , const char * name )
{
int ret ;
char * pidFile = NULL ;
if ( asprintf ( & pidFile , " %s/%s.pid " , piddir , name ) < 0 ) {
DEBUG ( 0 , ( " ERROR: Out of memory \n " ) ) ;
exit ( 1 ) ;
}
ret = unlink ( pidFile ) ;
if ( ret = = - 1 ) {
DEBUG ( 0 , ( " Failed to delete pidfile %s. Error was %s \n " ,
pidFile , strerror ( errno ) ) ) ;
}
}