https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297466
Bug ID: 297466
Summary: linuxlator: unsupported POLLMSG, events(-1)
Product: Base System
Version: 15.1-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Testcase: The Linux agent binary installed by misc/grok-build prints messages
like this into the system log:
> linux: jid 0 pid 5045 (tokio-rt-worker): unsupported POLLMSG, events(-1)
---example---
#include <stdio.h>
#include <poll.h>
#include <unistd.h>
#include <fcntl.h>
int main() {
// 1. Open a standard file descriptor (e.g., /dev/null)
int fd = open("/dev/null", O_RDONLY);
if (fd < 0) {
perror("Failed to open file descriptor");
return 1;
}
struct pollfd pfd;
pfd.fd = fd;
// 2. Set events to -1 (0xFFFF), which activates POLLMSG implicitly
pfd.events = -1;
pfd.revents = 0;
printf("Invoking poll() with events = %d (Implicitly requesting POLLMSG
0x%X)...\n",
pfd.events, POLLMSG);
// 3. Trigger the syscall
int ret = poll(&pfd, 1, 100);
close(fd);
return 0;
}
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