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start: non-functional changes

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Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2017-12-31 01:48:01 +01:00
parent 766a3b2ee9
commit df0795b1bd
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GPG Key ID: 8EB056D53EECB12D
1 changed files with 20 additions and 19 deletions
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39
src/lxc/start.c
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@ -266,35 +266,36 @@ restart:
static int setup_signal_fd(sigset_t *oldmask)
{
int ret, sig;
sigset_t mask;
int fd;
int signals[] = {SIGBUS, SIGILL, SIGSEGV, SIGWINCH};
/* Block everything except serious error signals. */
if (sigfillset(&mask) ||
sigdelset(&mask, SIGILL) ||
sigdelset(&mask, SIGSEGV) ||
sigdelset(&mask, SIGBUS) ||
sigdelset(&mask, SIGWINCH) ||
sigprocmask(SIG_BLOCK, &mask, oldmask)) {
SYSERROR("Failed to set signal mask.");
return -1;
ret = sigfillset(&mask);
if (ret < 0)
return -EBADF;
for (sig = 0; sig < (sizeof(signals) / sizeof(signals[0])); sig++) {
ret = sigdelset(&mask, signals[sig]);
if (ret < 0)
return -EBADF;
}
fd = signalfd(-1, &mask, 0);
if (fd < 0) {
SYSERROR("Failed to create signal file descriptor.");
return -1;
ret = sigprocmask(SIG_BLOCK, &mask, oldmask);
if (ret < 0) {
SYSERROR("Failed to set signal mask");
return -EBADF;
}
if (fcntl(fd, F_SETFD, FD_CLOEXEC)) {
SYSERROR("Failed to set FD_CLOEXEC on the signal file descriptor: %d.", fd);
close(fd);
return -1;
ret = signalfd(-1, &mask, SFD_CLOEXEC);
if (ret < 0) {
SYSERROR("Failed to create signal file descriptor");
return -EBADF;
}
DEBUG("Set SIGCHLD handler with file descriptor: %d.", fd);
TRACE("Created signal file descriptor %d", ret);
return fd;
return ret;
}
static int signal_handler(int fd, uint32_t events, void *data,