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closes bpo-38712: Add signal.pidfd_send_signal. (GH-17070)

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This exposes a Linux-specific syscall for sending a signal to a process
identified by a file descriptor rather than a pid.

For simplicity, we don't support the siginfo_t parameter to the syscall. This
parameter allows implementing a pidfd version of rt_sigqueueinfo(2), which
Python also doesn't support.
This commit is contained in:
Benjamin Peterson 2019-11-19 20:39:14 -08:00 • committed by GitHub
parent be143ec996
commit 7483451577
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6 changed files with 153 additions and 1 deletions
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36
Modules/signalmodule.c
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@ -25,6 +25,9 @@
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_SYS_SYSCALL_H
#include <sys/syscall.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
@ -1250,6 +1253,38 @@ signal_pthread_kill_impl(PyObject *module, unsigned long thread_id,
#endif /* #if defined(HAVE_PTHREAD_KILL) */
#if defined(__linux__) && defined(__NR_pidfd_send_signal)
/*[clinic input]
signal.pidfd_send_signal
pidfd: int
signalnum: int
siginfo: object = None
flags: int = 0
/
Send a signal to a process referred to by a pid file descriptor.
[clinic start generated code]*/
static PyObject *
signal_pidfd_send_signal_impl(PyObject *module, int pidfd, int signalnum,
PyObject *siginfo, int flags)
/*[clinic end generated code: output=2d59f04a75d9cbdf input=2a6543a1f4ac2000]*/
{
if (siginfo != Py_None) {
PyErr_SetString(PyExc_TypeError, "siginfo must be None");
return NULL;
}
if (syscall(__NR_pidfd_send_signal, pidfd, signalnum, NULL, flags) < 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
Py_RETURN_NONE;
}
#endif
/* List of functions defined in the module -- some of the methoddefs are
defined to nothing if the corresponding C function is not available. */
@ -1265,6 +1300,7 @@ static PyMethodDef signal_methods[] = {
{"set_wakeup_fd", (PyCFunction)(void(*)(void))signal_set_wakeup_fd, METH_VARARGS | METH_KEYWORDS, set_wakeup_fd_doc},
SIGNAL_SIGINTERRUPT_METHODDEF
SIGNAL_PAUSE_METHODDEF
SIGNAL_PIDFD_SEND_SIGNAL_METHODDEF
SIGNAL_PTHREAD_KILL_METHODDEF
SIGNAL_PTHREAD_SIGMASK_METHODDEF
SIGNAL_SIGPENDING_METHODDEF