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208 lines
4.2 KiB
208 lines
4.2 KiB
#pragma once
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <string>
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#include <atomic>
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#include <cassert>
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namespace gp{
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using open_opt_flags = int;
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enum class open_options : open_opt_flags {
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append = O_APPEND,
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create = O_CREAT,
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async = O_ASYNC,
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direct = O_DIRECT,
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data_sync = O_DSYNC,
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file_sync = O_SYNC,
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exclusive = O_EXCL,
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no_access_time = O_NOATIME,
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no_follow = O_NOFOLLOW,
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read = O_RDONLY,
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write = O_WRONLY,
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#ifdef O_TEMP
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temporary = O_TEMP,
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#endif
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#ifdef O_TRUC
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truncate = O_TRUC,
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#endif
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};
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using open_opt_mode = int;
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enum class open_modes : open_opt_mode {
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user_read = S_IRUSR,
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user_write = S_IWUSR,
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user_exec = S_IXUSR,
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group_read = S_IRGRP,
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group_write = S_IWGRP,
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group_exec = S_IXGRP,
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other_read = S_IROTH,
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other_write = S_IWOTH,
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other_exec = S_IXOTH,
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set_uid = S_ISUID,
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set_gid = S_ISGID,
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sticky_bit = S_ISVTX,
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};
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enum class net_socket_domain : int {
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ip4 = AF_INET,
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ip6 = AF_INET6
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};
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enum class net_socket_protocol : int {
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tcp = SOCK_STREAM,
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udp = SOCK_DGRAM
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};
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using socket_opt_flags = int;
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enum class net_socket_opt_flags : socket_opt_flags {
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non_blocking = SOCK_NONBLOCK,
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close_on_exec = SOCK_CLOEXEC,
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};
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using socket_opt_flags = int;
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enum class unix_socket_opt_flags : socket_opt_flags {
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non_blocking = SOCK_NONBLOCK,
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close_on_exec = SOCK_CLOEXEC,
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};
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class shared_fd {
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int fd;
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std::atomic_int* guard;
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int last_error;
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shared_fd(int fd_v)
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: fd(fd_v)
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, guard(new std::atomic_int{1})
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, last_error(0)
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{}
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public:
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shared_fd()
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: fd(-1)
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, guard(nullptr)
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, last_error(0)
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{}
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shared_fd(const shared_fd& oth)
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: fd(oth.fd)
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, guard(oth.guard)
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, last_error(0)
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{
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if(guard)
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guard->fetch_add(1, std::memory_order_acq_rel);
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}
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shared_fd(shared_fd&& oth)
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: last_error(0)
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{
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fd=oth.fd;
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guard=oth.guard;
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oth.fd=-1;
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oth.guard=nullptr;
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}
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void operator=(const shared_fd& oth)
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{
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this->~shared_fd();
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fd = oth.fd;
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guard = oth.guard;
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if(guard)
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guard->fetch_add(1, std::memory_order_acq_rel);
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}
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void operator=(shared_fd&& oth)
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{
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std::swap(fd,oth.fd);
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std::swap(guard,oth.guard);
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}
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static shared_fd open(const std::string& filename, const open_opt_flags& flags, const open_opt_mode& mode = 0)
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{
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shared_fd ret{::open(filename.c_str(), flags, mode)};
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return ret;
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}
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static shared_fd create(const std::string& filename, const open_opt_mode& mode)
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{
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shared_fd ret{::creat(filename.c_str(), mode)};
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return ret;
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}
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static shared_fd net_socket(const net_socket_domain& dom, const net_socket_protocol& proto, net_socket_opt_flags& flags)
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{
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shared_fd ret{::socket((int)dom, (int)proto, (int)flags)};
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return ret;
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}
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static shared_fd unix_socket(const net_socket_protocol& proto, const socket_opt_flags flags) {
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shared_fd ret{::socket((int)AF_UNIX, (int)proto, (int)flags)};
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return ret;
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}
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static std::pair<shared_fd,shared_fd> unix_socket_pair(const net_socket_protocol& proto, const socket_opt_flags flags) {
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std::pair<gp::shared_fd, gp::shared_fd> ret;
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int fds[2];
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auto result = ::socketpair((int)AF_UNIX, (int)proto, (int)flags, fds);
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if(result != 0)
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return ret;
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ret.first = shared_fd(fds[0]);
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ret.second = shared_fd(fds[1]);
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return ret;
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}
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bool is_valid() const {
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return guard && (fd>=0);
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}
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bool has_failed() const {
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return last_error;
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}
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std::string_view read(const std::string_view buffer)
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{
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int sz = ::read(fd, (void*)(buffer.begin()), buffer.size());
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if(sz<0)
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last_error = errno;
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else
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last_error = 0;
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sz = sz<0?0:sz;
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return std::string_view(buffer.begin(), sz);
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}
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std::string_view write(const std::string_view buffer)
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{
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int sz = ::write(fd, (void*)(buffer.begin()), buffer.size());
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if(sz<0)
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last_error = errno;
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else
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last_error = 0;
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sz = sz<0?0:sz;
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return std::string_view(buffer.begin()+sz, buffer.size()-sz);
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}
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~shared_fd()
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{
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if(guard)
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if(guard->fetch_sub(1, std::memory_order_acq_rel) == 1)
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{
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assert(guard->load() == 0);
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assert(fd >= 0);
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delete guard;
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guard = nullptr;
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if(fd >= 0)
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{
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::close(fd);
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}
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}
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}
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};
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}
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