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Remove C-style casts

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This commit is contained in:
Jacek Galowicz 2023-11-02 15:52:38 +01:00
parent d11d7849f7
commit 9d9f42cc38
3 changed files with 17 additions and 7 deletions
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18
src/libutil/unix-domain-socket.cc
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@ -38,6 +38,14 @@ AutoCloseFD createUnixDomainSocket(const Path & path, mode_t mode)
return fdSocket;
}
static struct sockaddr* safeSockAddrPointerCast(struct sockaddr_un *addr) {
// Casting between types like these legacy C library interfaces require
// is forbidden in C++.
// To maintain backwards compatibility, the implementation of the
// bind function contains some hints to the compiler that allow for this
// special case.
return reinterpret_cast<struct sockaddr *>(addr);
}
void bind(int fd, const std::string & path)
{
@ -45,6 +53,7 @@ void bind(int fd, const std::string & path)
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
auto psaddr {safeSockAddrPointerCast(&addr)};
if (path.size() + 1 >= sizeof(addr.sun_path)) {
Pid pid = startProcess([&] {
@ -55,7 +64,7 @@ void bind(int fd, const std::string & path)
if (base.size() + 1 >= sizeof(addr.sun_path))
throw Error("socket path '%s' is too long", base);
memcpy(addr.sun_path, base.c_str(), base.size() + 1);
if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
if (bind(fd, psaddr, sizeof(addr)) == -1)
throw SysError("cannot bind to socket '%s'", path);
_exit(0);
});
@ -64,7 +73,7 @@ void bind(int fd, const std::string & path)
throw Error("cannot bind to socket '%s'", path);
} else {
memcpy(addr.sun_path, path.c_str(), path.size() + 1);
if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
if (bind(fd, psaddr, sizeof(addr)) == -1)
throw SysError("cannot bind to socket '%s'", path);
}
}
@ -74,6 +83,7 @@ void connect(int fd, const std::string & path)
{
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
auto psaddr {safeSockAddrPointerCast(&addr)};
if (path.size() + 1 >= sizeof(addr.sun_path)) {
Pipe pipe;
@ -88,7 +98,7 @@ void connect(int fd, const std::string & path)
if (base.size() + 1 >= sizeof(addr.sun_path))
throw Error("socket path '%s' is too long", base);
memcpy(addr.sun_path, base.c_str(), base.size() + 1);
if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
if (connect(fd, psaddr, sizeof(addr)) == -1)
throw SysError("cannot connect to socket at '%s'", path);
writeFull(pipe.writeSide.get(), "0\n");
} catch (SysError & e) {
@ -107,7 +117,7 @@ void connect(int fd, const std::string & path)
}
} else {
memcpy(addr.sun_path, path.c_str(), path.size() + 1);
if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
if (connect(fd, psaddr, sizeof(addr)) == -1)
throw SysError("cannot connect to socket at '%s'", path);
}
}