backupc 错误：子进程过早退出
突然，一台服务器无法备份。我收到一条奇怪的错误消息：
2011-01-04 10:10:37 host1: Can't fork at /usr/share/backuppc/lib/BackupPC/Lib.pm line 1128.
这个错误是什么意思？
所有其他主机（具有相同操作系统）都没有此问题。
预先感谢您的回复。 :)
$cmd = [split(/\s+/, $cmd)] if ( ref($cmd) ne "ARRAY" );
print(STDERR "cmdSystemOrEval: about to system ",
$bpc->execCmd2ShellCmd(@$cmd), "\n")
if ( $bpc->{verbose} );
if ( !defined($pid = open(CHILD, "-|")) ) { # <<<<<<<<< 1128
my $err = "Can't fork to run @$cmd\n";
$? = 1;
$$stdoutCB .= $err if ( ref($stdoutCB) eq 'SCALAR' );
&$stdoutCB($err) if ( ref($stdoutCB) eq 'CODE' );
return $err if ( !defined($stdoutCB) );
return;
}
binmode(CHILD);
if ( !$pid ) {
#
# This is the child
#
close(STDERR);
if ( $ignoreStderr ) {
open(STDERR, ">", "/dev/null");
} else {
open(STDERR, ">&STDOUT");
}
alarm(0);
$cmd = [map { m/(.*)/ } @$cmd]; # untaint
#
# force list-form of exec(), ie: no shell even for 1 arg
#
exec { $cmd->[0] } @$cmd;
print(STDERR "Exec of @$cmd failed\n");
exit(1);
}
Suddenly, one server cannot be backed up. i get a strange error message:
2011-01-04 10:10:37 host1: Can't fork at /usr/share/backuppc/lib/BackupPC/Lib.pm line 1128.
What does this error mean?
All other hosts (with same OS) don't have this problem.
Thanks in advance for any reply. :)
$cmd = [split(/\s+/, $cmd)] if ( ref($cmd) ne "ARRAY" );
print(STDERR "cmdSystemOrEval: about to system ",
$bpc->execCmd2ShellCmd(@$cmd), "\n")
if ( $bpc->{verbose} );
if ( !defined($pid = open(CHILD, "-|")) ) { # <<<<<<<<< 1128
my $err = "Can't fork to run @$cmd\n";
$? = 1;
$stdoutCB .= $err if ( ref($stdoutCB) eq 'SCALAR' );
&$stdoutCB($err) if ( ref($stdoutCB) eq 'CODE' );
return $err if ( !defined($stdoutCB) );
return;
}
binmode(CHILD);
if ( !$pid ) {
#
# This is the child
#
close(STDERR);
if ( $ignoreStderr ) {
open(STDERR, ">", "/dev/null");
} else {
open(STDERR, ">&STDOUT");
}
alarm(0);
$cmd = [map { m/(.*)/ } @$cmd]; # untaint
#
# force list-form of exec(), ie: no shell even for 1 arg
#
exec { $cmd->[0] } @$cmd;
print(STDERR "Exec of @$cmd failed\n");
exit(1);
}
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由于某种原因，顶部给出的错误消息与代码中给出的错误消息不匹配。
错误消息缺少报告
$ERRNO。请参阅 fork(2) 了解此系统调用的失败模式。改进错误报告，那么您就无需猜测原因。
The error message given at the top does not match the error message given in the code for some reason.
The error message lacks reporting
$ERRNO. See fork(2) for the modes of failure for this system call.Improve error reporting, then you need not guess about the cause.