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kill: support signal number 0

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Tests process existence, but does not send a signal. Matches POSIX
behavior.
This commit is contained in:
Ian Douglas Scott
2018-03-18 21:52:48 -07:00
parent 6dfed91ac3
commit 3b09c8f858
1 changed files with 10 additions and 6 deletions
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16
src/syscall/process.rs
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@@ -1050,7 +1050,7 @@ pub fn kill(pid: ContextId, sig: usize) -> Result<usize> {
(context.ruid, context.euid, context.pgid)
};
if sig > 0 && sig < 0x7F {
if sig >= 0 && sig < 0x7F {
let mut found = 0;
let mut sent = 0;
@@ -1062,11 +1062,15 @@ pub fn kill(pid: ContextId, sig: usize) -> Result<usize> {
|| euid == context.ruid
|| ruid == context.ruid
{
context.pending.push_back(sig as u8);
// Convert stopped processes to blocked if sending SIGCONT
if sig == SIGCONT {
if let context::Status::Stopped(_sig) = context.status {
context.status = context::Status::Blocked;
// If sig = 0, test that process exists and can be
// signalled, but don't send any signal.
if sig != 0 {
context.pending.push_back(sig as u8);
// Convert stopped processes to blocked if sending SIGCONT
if sig == SIGCONT {
if let context::Status::Stopped(_sig) = context.status {
context.status = context::Status::Blocked;
}
}
}
true