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systemtap
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transport
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Filename :
transport_msgs.h
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/* -*- linux-c -*- * transport_msgs.h - messages exchanged between module and userspace * * Copyright (C) Red Hat Inc, 2006-2011 * * This file is part of systemtap, and is free software. You can * redistribute it and/or modify it under the terms of the GNU General * Public License (GPL); either version 2, or (at your option) any * later version. */ /* * NB: consider backward compatibility implications such as PR12612 * before changing existing message structures in any way. */ #define STP_MODULE_NAME_LEN 128 #define STP_SYMBOL_NAME_LEN 128 #define STP_TZ_NAME_LEN 64 #define STP_REMOTE_URI_LEN 128 struct _stp_trace { uint32_t sequence; /* event number */ uint32_t pdu_len; /* length of data after this trace */ }; /* stp control channel command values */ enum { /** stapio sends a STP_START after recieving a STP_TRANSPORT from the module. The module sends STP_START back with result of call systemtap_module_init() which will install all initial probes. */ STP_START, /** stapio sends STP_EXIT to signal it wants to stop the module itself or in response to receiving a STP_REQUEST_EXIT. The module sends STP_EXIT once _stp_clean_and_exit has been called (the first time) in reponse to a STP_EXIT or an rmmod. */ STP_EXIT, /** _stp_warn and _stp_error messages from the module. stapio parses the start if the message payload string to determine whether it is a WARNING: or ERROR:. */ STP_OOB_DATA, /** Send by the module (tapset/system.stp) to request stapio to execute a shell command with the given message payload. */ STP_SYSTEM, /** modules sends STP_TRANSPORT to stapio when ready to recieve a STP_START message. stapio sends STP_BULK and then STP_START back. */ STP_TRANSPORT, /** Never used. */ STP_CONNECT, /** Never used. */ STP_DISCONNECT, /** Send by the staprun when initializing relayfs in response to a STP_TRANSPORT message with a (empty) 127 char payload. Silently absorbed by module when in STP_BULKMODE (percpu files), otherwise returns -EINVAL to indicate bulkmode is disabled. */ STP_BULK, /** Send as first message from staprun stp_main_loop, but never never acted upon. Used to be initial message for message to start requestion symbol data (symbol data is now compiled into the module). */ STP_READY, /** Send by staprun at startup to notify module of where the kernel (_stext) and all other modules are loaded. */ STP_RELOCATION, /** Never used. deprecated STP_TRANSPORT_VERSION == 1 **/ STP_BUF_INFO, /** Never used. */ STP_SUBBUFS_CONSUMED, /** Used by the module only when STP_TRANSPORT_VERSION == 1 for stapio to write realtime data packet to disk. */ STP_REALTIME_DATA, /** Send by the module when it gets unloaded or STP_EXIT has been received by stapio. */ STP_REQUEST_EXIT, /** Send by staprun to notify module of current timezone. Only send once at startup. */ STP_TZINFO, /** Send by staprun to notify module of the user's privilege credentials. Only send once at startup. */ STP_PRIVILEGE_CREDENTIALS, /** Send by staprun to notify module of remote identity, if any. Only send once at startup. */ STP_REMOTE_ID, /** Max number of message types, sanity check only. */ STP_MAX_CMD, /** Sent by stapio after having recevied STP_TRANSPORT. Notifies the module of the target namespaces pid.*/ STP_NAMESPACES_PID }; #ifdef DEBUG_TRANS static const char *_stp_command_name[] = { "STP_START", "STP_EXIT", "STP_OOB_DATA", "STP_SYSTEM", "STP_TRANSPORT", "STP_CONNECT", "STP_DISCONNECT", "STP_BULK", "STP_READY", "STP_RELOCATION", "STP_BUF_INFO", "STP_SUBBUFS_CONSUMED", "STP_REALTIME_DATA", "STP_REQUEST_EXIT", "STP_TZINFO", "STP_PRIVILEGE_CREDENTIALS", "STP_REMOTE_ID", "STP_NAMESPACES_PID", }; #endif /* DEBUG_TRANS */ /* control channel messages */ /* command to execute: module->stapio */ struct _stp_msg_cmd { char cmd[128]; }; /* Unwind data. stapio->module */ struct _stp_msg_unwind { /* the module name, or "*" for all */ char name[STP_MODULE_NAME_LEN]; /* length of unwind data */ uint32_t unwind_len; /* data ...*/ }; /* Request to start probes. */ /* stapio->module->stapio */ struct _stp_msg_start { pid_t target; int32_t res; // for reply: result of systemtap_module_init }; /* target namespaces pid */ struct _stp_msg_ns_pid { pid_t target; }; #if STP_TRANSPORT_VERSION == 1 /**** for compatibility with old relayfs ****/ struct _stp_buf_info { int32_t cpu; uint32_t produced; uint32_t consumed; int32_t flushing; }; struct _stp_consumed_info { int32_t cpu; uint32_t consumed; }; #endif /* Unwind data. stapio->module */ struct _stp_msg_relocation { char module[STP_MODULE_NAME_LEN]; char reloc[STP_SYMBOL_NAME_LEN]; uint64_t address; }; struct _stp_msg_tzinfo { int64_t tz_gmtoff; char tz_name[STP_TZ_NAME_LEN]; }; struct _stp_msg_privilege_credentials { int32_t pc_group_mask; }; struct _stp_msg_remote_id { int32_t remote_id; char remote_uri[STP_REMOTE_URI_LEN]; };