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(trunk daemon) simplify the code in the fallback implementation of daemon() for systems that don't have this function themselves.

This commit is contained in:
Jordan Lee 2011-02-18 17:05:17 +00:00
parent e7fc697c90
commit f8b739f0f9
1 changed files with 25 additions and 37 deletions
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62
daemon/daemon.c
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@ -173,48 +173,36 @@ static int
tr_daemon( int nochdir, int noclose )
{
#if defined(USE_OS_DAEMON)
return daemon( nochdir, noclose );
#elif defined(USE_TR_DAEMON)
pid_t pid = fork( );
if( pid < 0 )
return -1;
else if( pid > 0 )
_exit( 0 );
else {
pid = setsid( );
if( pid < 0 )
return -1;
pid = fork( );
if( pid < 0 )
return -1;
else if( pid > 0 )
_exit( 0 );
else {
/* this is loosely based off of glibc's daemon() implementation
* http://sourceware.org/git/?p=glibc.git;a=blob_plain;f=misc/daemon.c */
if( !nochdir )
if( chdir( "/" ) < 0 )
return -1;
umask( (mode_t)0 );
if( !noclose ) {
/* send stdin, stdout, and stderr to /dev/null */
int i;
int fd = open( "/dev/null", O_RDWR, 0 );
if( fd < 0 )
fprintf( stderr, "unable to open /dev/null: %s\n", tr_strerror(errno) );
for( i=0; i<3; ++i ) {
if( close( i ) )
return -1;
dup2( fd, i );
}
close( fd );
}
return 0;
}
switch( fork( ) ) {
case -1: return -1;
case 0: break;
default: _exit(0);
}
if( setsid( ) == -1 )
return -1;
if( !nochdir )
chdir( "/" );
if( !noclose ) {
int fd = open( "/dev/null", O_RDWR, 0 );
dup2( fd, STDIN_FILENO );
dup2( fd, STDOUT_FILENO );
dup2( fd, STDERR_FILENO );
close( fd );
}
return 0;
#else /* USE_NO_DAEMON */
return 0;
#endif