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Fix fork error handling #1

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Fix fork error handling #1

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6 changes: 3 additions & 3 deletions _posts/2018-03-31-in-memory-only-elf-execution.md
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Original file line number Diff line number Diff line change
Expand Up @@ -197,7 +197,7 @@ exit (say, run it multiple times), it's the way to go. In general, using
```perl
while ($keep_going) {
my $pid = fork();
if (-1 == $pid) { # Error
if (not defined $pid) { # Error
die "fork: $!";
}
if (0 == $pid) { # Child
Expand All @@ -214,7 +214,7 @@ terminate:
```perl
# Spawn child
my $pid = fork();
if (-1 == $pid) { # Error
if (not defined $pid) { # Error
die "fork1: $!";
}
if (0 != $pid) { # Parent terminates
Expand All @@ -227,7 +227,7 @@ if (-1 == syscall(112)) {

# Spawn grandchild
$pid = fork();
if (-1 == $pid) { # Error
if (not defined $pid) { # Error
die "fork2: $!";
}
if (0 != $pid) { # Child terminates
Expand Down