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portability: replace signalfd with self-pipe

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This commit is contained in:
Raphael Robatsch 2021-11-16 18:32:18 +01:00
parent 7da9aad117
commit 97176b3a10
2 changed files with 37 additions and 14 deletions
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1
src/common.hpp
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@ -40,6 +40,7 @@ extern wl_shm* shm;
extern zwlr_layer_shell_v1* wlrLayerShell;
void spawn(Monitor&, const Arg& arg);
void setCloexec(int fd);
[[noreturn]] void die(const char* why);
// wayland smart pointers

50
src/main.cpp
View File

@ -12,7 +12,6 @@
#include <signal.h>
#include <sys/epoll.h>
#include <sys/mman.h>
#include <sys/signalfd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
@ -81,6 +80,7 @@ static Monitor* selmon;
static std::string lastStatus;
static std::string statusFifoName;
static int epoll {-1};
static std::array<int, 2> signalSelfPipe;
static int displayFd {-1};
static int statusFifoFd {-1};
static int statusFifoWriter {-1};
@ -452,11 +452,25 @@ int main(int argc, char* argv[])
exit(0);
}
}
static sigset_t blockedsigs;
sigemptyset(&blockedsigs);
sigaddset(&blockedsigs, SIGINT);
sigaddset(&blockedsigs, SIGTERM);
sigprocmask(SIG_BLOCK, &blockedsigs, nullptr);
if (pipe(signalSelfPipe.data()) < 0) {
diesys("pipe");
}
setCloexec(signalSelfPipe[0]);
setCloexec(signalSelfPipe[1]);
struct sigaction sighandler = {};
sighandler.sa_handler = [](int) {
if (write(signalSelfPipe[1], "0", 1) < 0) {
diesys("write");
}
};
if (sigaction(SIGTERM, &sighandler, nullptr) < 0) {
diesys("sigaction");
}
if (sigaction(SIGINT, &sighandler, nullptr) < 0) {
diesys("sigaction");
}
epoll_event epollEv = {0};
std::array<epoll_event, 5> epollEvents;
@ -464,14 +478,11 @@ int main(int argc, char* argv[])
if (epoll < 0) {
diesys("epoll_create1");
}
int sfd = signalfd(-1, &blockedsigs, SFD_CLOEXEC | SFD_NONBLOCK);
if (sfd < 0) {
diesys("signalfd");
}
epollEv.events = EPOLLIN;
epollEv.data.fd = sfd;
if (epoll_ctl(epoll, EPOLL_CTL_ADD, sfd, &epollEv) < 0) {
diesys("epoll_ctl add signalfd");
epollEv.data.fd = signalSelfPipe[0];
if (epoll_ctl(epoll, EPOLL_CTL_ADD, signalSelfPipe[0], &epollEv) < 0) {
diesys("epoll_ctl add signal pipe");
}
display = wl_display_connect(nullptr);
@ -525,7 +536,7 @@ int main(int argc, char* argv[])
onStdin();
} else if (ev.data.fd == statusFifoFd) {
onStatus();
} else if (ev.data.fd == sfd) {
} else if (ev.data.fd == signalSelfPipe[0]) {
quitting = true;
}
}
@ -555,6 +566,17 @@ void waylandFlush()
}
}
void setCloexec(int fd)
{
int flags = fcntl(fd, F_GETFD);
if (flags == -1) {
diesys("fcntl FD_GETFD");
}
if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) {
diesys("fcntl FD_SETFD");
}
}
void cleanup() {
if (!statusFifoName.empty()) {
unlink(statusFifoName.c_str());