27852ebe53
This new implementation of the UDS service is built on top of the libsockevent library. It thereby inherits all the advantages that libsockevent brings. However, the fundamental restructuring required for that change also paved the way for resolution of a number of other important open issues with the old UDS code. Most importantly, the rewrite brings the behavior of the service much closer to POSIX compliance and NetBSD compatibility. These are the most important changes: - due to the use of libsockevent, UDS now supports multiple suspending calls per socket and a large number of standard socket flags and options; - socket address matching is now based on <device,inode> lookups instead of canonized path names, and socket addresses are no longer altered either due to canonization or at connect time; - the socket state machine is now well defined, most importantly resolving the erroneous reset-on-EOF semantics of the old UDS, but also allowing socket reuse; - sockets are now connected before being accepted instead of being held in connecting state, unless the LOCAL_CONNWAIT option is set on either the connecting or the listening socket; - connect(2) on datagram sockets is now supported (needed by syslog), and proper datagram socket disconnect notification is provided; - the receive queue now supports segmentation, associating ancillary data (in-flight file descriptors and credentials) with each segment instead of being kept fully separately; this is a POSIX requirement (and needed by tmux); - as part of the segmentation support, the receive queue can now hold as many packets as can fit, instead of one; - in addition to the flags supported by libsockevent, the MSG_PEEK, MSG_WAITALL, MSG_CMSG_CLOEXEC, MSG_TRUNC, and MSG_CTRUNC send and receive flags are now supported; - the SO_PASSCRED and SO_PEERCRED socket options are replaced by LOCAL_CREDS and LOCAL_PEEREID respectively, now following NetBSD semantics and allowing use of NetBSD libc's getpeereid(3); - memory usage is reduced by about 250 KB due to centralized in-flight file descriptor tracking, with a limit of OPEN_MAX total rather than of OPEN_MAX per socket; - memory usage is reduced by another ~50 KB due to removal of state redundancy, despite the fact that socket path names may now be up to 253 bytes rather than the previous 104 bytes; - compared to the old UDS, there is now very little direct indexing on the static array of sockets, thus allowing dynamic allocation of sockets more easily in the future; - the UDS service now has RMIB support for the net.local sysctl tree, implementing preliminary support for NetBSD netstat(1). Change-Id: I4a9b6fe4aaeef0edf2547eee894e6c14403fcb32
139 lines
5.2 KiB
C
139 lines
5.2 KiB
C
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/* call.c */
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void put_endpoint(struct trace_proc *proc, const char *name, endpoint_t endpt);
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void put_equals(struct trace_proc *proc);
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void put_result(struct trace_proc *proc);
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int default_out(struct trace_proc *proc, const message *m_out);
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void default_in(struct trace_proc *proc, const message *m_out,
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const message *m_in, int failed);
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int call_enter(struct trace_proc *proc, int show_stack);
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void call_leave(struct trace_proc *proc, int skip);
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void call_replay(struct trace_proc *proc);
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const char *call_name(struct trace_proc *proc);
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int call_errno(struct trace_proc *proc, int *err);
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/* error.c */
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const char *get_error_name(int err);
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/* escape.c */
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const char *get_escape(char c);
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/* format.c */
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void format_reset(struct trace_proc *proc);
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void format_set_sep(struct trace_proc *proc, const char *sep);
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void format_push_sep(struct trace_proc *proc);
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void put_field(struct trace_proc *proc, const char *name, const char *text);
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void put_open(struct trace_proc *proc, const char *name, int flags,
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const char *string, const char *separator);
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void put_close(struct trace_proc *proc, const char *string);
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void put_fmt(struct trace_proc *proc, const char *fmt, ...)
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__attribute__((__format__(__printf__, 2, 3)));
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void put_value(struct trace_proc *proc, const char *name, const char *fmt, ...)
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__attribute__((__format__(__printf__, 3, 4)));
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int put_open_struct(struct trace_proc *proc, const char *name, int flags,
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vir_bytes addr, void *ptr, size_t size);
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void put_close_struct(struct trace_proc *proc, int all);
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void put_ptr(struct trace_proc *proc, const char *name, vir_bytes addr);
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void put_buf(struct trace_proc *proc, const char *name, int flags,
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vir_bytes addr, ssize_t size);
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void put_flags(struct trace_proc *proc, const char *name,
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const struct flags *fp, unsigned int num, const char *fmt,
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unsigned int value);
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void put_tail(struct trace_proc * proc, unsigned int count,
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unsigned int printed);
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/* ioctl.c */
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void put_ioctl_req(struct trace_proc *proc, const char *name,
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unsigned long req, int is_svrctl);
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int put_ioctl_arg_out(struct trace_proc *proc, const char *name,
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unsigned long req, vir_bytes addr, int is_svrctl);
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void put_ioctl_arg_in(struct trace_proc *proc, const char *name, int failed,
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unsigned long req, vir_bytes addr, int is_svrctl);
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/* kernel.c */
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int kernel_check(pid_t pid);
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int kernel_get_name(pid_t pid, char *name, size_t size);
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int kernel_is_service(pid_t pid);
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int kernel_get_syscall(pid_t pid, reg_t reg[3]);
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int kernel_get_retreg(pid_t pid, reg_t *retreg);
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vir_bytes kernel_get_stacktop(void);
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int kernel_get_context(pid_t pid, reg_t *pc, reg_t *sp, reg_t *fp);
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void kernel_put_stacktrace(struct trace_proc * proc);
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/* mem.c */
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int mem_get_data(pid_t pid, vir_bytes addr, void *ptr, size_t len);
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int mem_get_user(pid_t pid, vir_bytes addr, void *ptr, size_t len);
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/* pm.c */
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void put_struct_timeval(struct trace_proc *proc, const char *name, int flags,
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vir_bytes addr);
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void put_time(struct trace_proc *proc, const char *name, time_t time);
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void put_groups(struct trace_proc * proc, const char * name, int flags,
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vir_bytes addr, int count);
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/* output.c */
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int output_init(const char *file);
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int output_error(void);
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void output_flush(void);
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void record_start(struct trace_proc *proc);
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void record_stop(struct trace_proc *proc);
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void record_clear(struct trace_proc *proc);
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int record_replay(struct trace_proc *proc);
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void put_newline(void);
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void put_text(struct trace_proc *proc, const char *text);
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void put_space(struct trace_proc *proc);
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void put_align(struct trace_proc *proc);
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/* proc.c */
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void proc_init(void);
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struct trace_proc *proc_add(pid_t pid);
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struct trace_proc *proc_get(pid_t pid);
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void proc_del(struct trace_proc *proc);
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struct trace_proc *proc_next(struct trace_proc *last);
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unsigned int proc_count(void);
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/* signal.c */
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const char *get_signal_name(int sig);
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/* trace.c */
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extern int timestamps;
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extern int allnames;
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extern unsigned int verbose;
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extern unsigned int valuesonly;
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/* service */
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const struct calls pm_calls;
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const struct calls vfs_calls;
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const struct calls rs_calls;
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const struct calls mib_calls;
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const struct calls vm_calls;
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const struct calls ipc_calls;
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/* service/vfs.c */
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void put_fd(struct trace_proc *proc, const char *name, int fd);
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void put_dev(struct trace_proc *proc, const char *name, dev_t dev);
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void put_in_addr(struct trace_proc *proc, const char *name, struct in_addr in);
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void put_socket_type(struct trace_proc *proc, const char *name, int type);
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void put_socket_family(struct trace_proc *proc, const char *name, int family);
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void put_cmsg_type(struct trace_proc *proc, const char *name, int type);
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void put_shutdown_how(struct trace_proc *proc, const char *name, int how);
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/* ioctl/block.c */
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const char *block_ioctl_name(unsigned long req);
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int block_ioctl_arg(struct trace_proc *proc, unsigned long req, void *ptr,
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int dir);
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/* ioctl/char.c */
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const char *char_ioctl_name(unsigned long req);
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int char_ioctl_arg(struct trace_proc *proc, unsigned long req, void *ptr,
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int dir);
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/* ioctl/net.c */
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const char *net_ioctl_name(unsigned long req);
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int net_ioctl_arg(struct trace_proc *proc, unsigned long req, void *ptr,
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int dir);
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/* ioctl/svrctl.c */
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const char *svrctl_name(unsigned long req);
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int svrctl_arg(struct trace_proc *proc, unsigned long req, void *ptr, int dir);
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