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Do not emit an error on ESRCH in PTRACE_CONT

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Process might be killed between waitpid and PTRACE_CONT,
even though a PTRACE_EVENT_EXIT will be gererated, continuing
will fail with ESRCH in that case.

PiperOrigin-RevId: 249245726
Change-Id: Ib673529229a306d2266fa60caa3039b6bcd80a65
This commit is contained in:
Wiktor Garbacz 2019-05-21 07:30:34 -07:00 committed by Copybara-Service
parent 15993a34e2
commit 71a317e65f
1 changed files with 14 additions and 4 deletions
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18
sandboxed_api/sandbox2/monitor.cc
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@ -92,15 +92,25 @@ void InterruptProcess(pid_t pid) {
void ContinueProcess(pid_t pid, int signo) {
if (ptrace(PTRACE_CONT, pid, 0, signo) == -1) {
PLOG(ERROR) << "ptrace(PTRACE_CONT, pid=" << pid << ", sig=" << signo
<< ")";
if (errno == ESRCH) {
LOG(WARNING) << "Process " << pid
<< " died while trying to PTRACE_CONT it";
} else {
PLOG(ERROR) << "ptrace(PTRACE_CONT, pid=" << pid << ", sig=" << signo
<< ")";
}
}
}
void StopProcess(pid_t pid, int signo) {
if (ptrace(PTRACE_LISTEN, pid, 0, signo) == -1) {
PLOG(ERROR) << "ptrace(PTRACE_LISTEN, pid=" << pid << ", sig=" << signo
<< ")";
if (errno == ESRCH) {
LOG(WARNING) << "Process " << pid
<< " died while trying to PTRACE_LISTEN it";
} else {
PLOG(ERROR) << "ptrace(PTRACE_CONT, pid=" << pid << ", sig=" << signo
<< ")";
}
}
}