[lxc-devel] [lxc/master] start: remove procfs pidfd support
brauner on Github
lxc-bot at linuxcontainers.org
Wed Dec 25 17:53:01 UTC 2019
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From 671b61a7096258f09eadc5ee3469b0b18b76f14b Mon Sep 17 00:00:00 2001
From: Christian Brauner <christian.brauner at ubuntu.com>
Date: Wed, 25 Dec 2019 18:50:53 +0100
Subject: [PATCH] start: remove procfs pidfd support
Signed-off-by: Christian Brauner <christian.brauner at ubuntu.com>
---
src/lxc/start.c | 43 -------------------------------------------
src/lxc/start.h | 6 ------
2 files changed, 49 deletions(-)
diff --git a/src/lxc/start.c b/src/lxc/start.c
index d62acf4bd8..f085aa60d0 100644
--- a/src/lxc/start.c
+++ b/src/lxc/start.c
@@ -385,8 +385,6 @@ static int signal_handler(int fd, uint32_t events, void *data,
if (siginfo.ssi_signo == SIGHUP) {
if (hdlr->pidfd >= 0)
lxc_raw_pidfd_send_signal(hdlr->pidfd, SIGTERM, NULL, 0);
- else if (hdlr->proc_pidfd >= 0)
- lxc_raw_pidfd_send_signal(hdlr->proc_pidfd, SIGTERM, NULL, 0);
else
kill(hdlr->pid, SIGTERM);
INFO("Killing %d since terminal hung up", hdlr->pid);
@@ -398,9 +396,6 @@ static int signal_handler(int fd, uint32_t events, void *data,
if (hdlr->pidfd >= 0)
lxc_raw_pidfd_send_signal(hdlr->pidfd,
siginfo.ssi_signo, NULL, 0);
- else if (hdlr->proc_pidfd >= 0)
- lxc_raw_pidfd_send_signal(hdlr->proc_pidfd,
- siginfo.ssi_signo, NULL, 0);
else
kill(hdlr->pid, siginfo.ssi_signo);
INFO("Forwarded signal %d to pid %d", siginfo.ssi_signo, hdlr->pid);
@@ -649,8 +644,6 @@ void lxc_zero_handler(struct lxc_handler *handler)
handler->pidfd = -EBADF;
- handler->proc_pidfd = -EBADF;
-
handler->sigfd = -1;
for (i = 0; i < LXC_NS_MAX; i++)
@@ -674,9 +667,6 @@ void lxc_free_handler(struct lxc_handler *handler)
if (handler->pidfd >= 0)
close(handler->pidfd);
- if (handler->proc_pidfd >= 0)
- close(handler->proc_pidfd);
-
if (handler->sigfd >= 0)
close(handler->sigfd);
@@ -726,7 +716,6 @@ struct lxc_handler *lxc_init_handler(const char *name, struct lxc_conf *conf,
handler->monitor_status_fd = -EBADF;
handler->pinfd = -1;
handler->pidfd = -EBADF;
- handler->proc_pidfd = -EBADF;
handler->sigfd = -EBADF;
handler->init_died = false;
handler->state_socket_pair[0] = handler->state_socket_pair[1] = -1;
@@ -1104,8 +1093,6 @@ void lxc_abort(const char *name, struct lxc_handler *handler)
if (handler->pidfd >= 0)
ret = lxc_raw_pidfd_send_signal(handler->pidfd, SIGKILL, NULL, 0);
- else if (handler->proc_pidfd >= 0)
- ret = lxc_raw_pidfd_send_signal(handler->proc_pidfd, SIGKILL, NULL, 0);
else if (handler->pid > 0)
ret = kill(handler->pid, SIGKILL);
if (ret < 0)
@@ -1624,30 +1611,6 @@ static inline int do_share_ns(void *arg)
return 0;
}
-static int proc_pidfd_open(pid_t pid)
-{
- __do_close_prot_errno int proc_pidfd = -EBADF;
- char path[100];
-
- snprintf(path, sizeof(path), "/proc/%d", pid);
- proc_pidfd = open(path, O_DIRECTORY | O_RDONLY | O_CLOEXEC);
- if (proc_pidfd < 0) {
- SYSERROR("Failed to open %s", path);
- return -1;
- }
-
- /* Test whether we can send signals. */
- if (lxc_raw_pidfd_send_signal(proc_pidfd, 0, NULL, 0)) {
- if (errno != ENOSYS)
- SYSERROR("Failed to send signal through pidfd");
- else
- INFO("Sending signals through pidfds not supported on this kernel");
- return -1;
- }
-
- return move_fd(proc_pidfd);
-}
-
/* lxc_spawn() performs crucial setup tasks and clone()s the new process which
* exec()s the requested container binary.
* Note that lxc_spawn() runs in the parent namespaces. Any operations performed
@@ -1759,12 +1722,6 @@ static int lxc_spawn(struct lxc_handler *handler)
}
TRACE("Cloned child process %d", handler->pid);
- if (handler->pidfd < 0) {
- handler->proc_pidfd = proc_pidfd_open(handler->pid);
- if (handler->proc_pidfd < 0 && (errno != ENOSYS))
- goto out_delete_net;
- }
-
ret = snprintf(pidstr, 20, "%d", handler->pid);
if (ret < 0 || ret >= 20)
goto out_delete_net;
diff --git a/src/lxc/start.h b/src/lxc/start.h
index 662ac55704..f40b4d661e 100644
--- a/src/lxc/start.h
+++ b/src/lxc/start.h
@@ -83,12 +83,6 @@ struct lxc_handler {
/* The child's pidfd. */
int pidfd;
- /*
- * File descriptor for the /proc/<pid> directory of the container's
- * init process.
- */
- int proc_pidfd;
-
/* The grandfather's pid when double-forking. */
pid_t transient_pid;
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