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Diffstat (limited to 'include/iprt/process.h')
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diff --git a/include/iprt/process.h b/include/iprt/process.h new file mode 100644 index 00000000..66ea1296 --- /dev/null +++ b/include/iprt/process.h @@ -0,0 +1,424 @@ +/** @file + * IPRT - Process Management. + */ + +/* + * Copyright (C) 2006-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + +#ifndef IPRT_INCLUDED_process_h +#define IPRT_INCLUDED_process_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/cdefs.h> +#include <iprt/types.h> + +RT_C_DECLS_BEGIN + +/** @defgroup grp_rt_process RTProc - Process Management + * @ingroup grp_rt + * @{ + */ + + +/** + * Process priority. + * + * The process priority is used to select how scheduling properties + * are assigned to the different thread types (see THREADTYPE). + * + * In addition to using the policy assigned to the process at startup (DEFAULT) + * it is possible to change the process priority at runtime. This allows for + * a GUI, resource manager or admin to adjust the general priority of a task + * without upsetting the fine-tuned priority of the threads within. + */ +typedef enum RTPROCPRIORITY +{ + /** Invalid priority. */ + RTPROCPRIORITY_INVALID = 0, + /** Default priority. + * Derive the scheduling policy from the priority of the RTR3Init() + * and RTProcSetPriority() callers and the rights the process have + * to alter its own priority. + */ + RTPROCPRIORITY_DEFAULT, + /** Flat priority. + * Assumes a scheduling policy which puts the process at the default priority + * and with all thread at the same priority. + */ + RTPROCPRIORITY_FLAT, + /** Low priority. + * Assumes a scheduling policy which puts the process mostly below the + * default priority of the host OS. + */ + RTPROCPRIORITY_LOW, + /** Normal priority. + * Assume a scheduling policy which shares the CPU resources fairly with + * other processes running with the default priority of the host OS. + */ + RTPROCPRIORITY_NORMAL, + /** High priority. + * Assumes a scheduling policy which puts the task above the default + * priority of the host OS. This policy might easily cause other tasks + * in the system to starve. + */ + RTPROCPRIORITY_HIGH, + /** Last priority, used for validation. */ + RTPROCPRIORITY_LAST +} RTPROCPRIORITY; + + +/** + * Get the current process identifier. + * + * @returns Process identifier. + */ +RTDECL(RTPROCESS) RTProcSelf(void); + + +#ifdef IN_RING0 +/** + * Get the current process handle. + * + * @returns Ring-0 process handle. + */ +RTR0DECL(RTR0PROCESS) RTR0ProcHandleSelf(void); +#endif + + +#ifdef IN_RING3 + +/** + * Attempts to alter the priority of the current process. + * + * @returns iprt status code. + * @param enmPriority The new priority. + */ +RTR3DECL(int) RTProcSetPriority(RTPROCPRIORITY enmPriority); + +/** + * Gets the current priority of this process. + * + * @returns The priority (see RTPROCPRIORITY). + */ +RTR3DECL(RTPROCPRIORITY) RTProcGetPriority(void); + +/** + * Create a child process. + * + * @returns iprt status code. + * @param pszExec Executable image to use to create the child process. + * @param papszArgs Pointer to an array of arguments to the child. The array terminated by an entry containing NULL. + * @param Env Handle to the environment block for the child. + * @param fFlags Flags, one of the RTPROC_FLAGS_* defines. + * @param pProcess Where to store the process identifier on successful return. + * The content is not changed on failure. NULL is allowed. + */ +RTR3DECL(int) RTProcCreate(const char *pszExec, const char * const *papszArgs, RTENV Env, unsigned fFlags, PRTPROCESS pProcess); + + +/** + * Create a child process. + * + * @returns IPRT status code. + * + * @param pszExec Executable image to use to create the child process. + * @param papszArgs Pointer to an array of arguments to the child. The + * array terminated by an entry containing NULL. + * @param hEnv Handle to the environment block for the child. Pass + * RTENV_DEFAULT to use the environment of the current + * process. + * @param fFlags Flags, one of the RTPROC_FLAGS_* defines. + * @param phStdIn The standard in handle to assign the new process. Pass + * NULL to use the same as the current process. If the + * handle is NIL, we'll close the standard input of the + * guest. + * @param phStdOut The standard out handle to assign the new process. Pass + * NULL to use the same as the current process. If the + * handle is NIL, we'll close the standard output of the + * guest. + * @param phStdErr The standard error handle to assign the new process. Pass + * NULL to use the same as the current process. If the + * handle is NIL, we'll close the standard error of the + * guest. + * @param pszAsUser User to run the process as. Pass NULL to use the same + * user as the current process. + * Windows: Use user\@domain (UPN, User Principal Name) + * format to specify a domain. + * @param pszPassword Password to use to authenticate @a pszAsUser. Must be + * NULL wif pszAsUser is NULL. Whether this is actually + * used or not depends on the platform. + * @param phProcess Where to store the process handle on successful return. + * The content is not changed on failure. NULL is allowed. + * + * @remarks The handles does not have to be created as inheritable, but it + * doesn't hurt if they are as it may avoid race conditions on some + * platforms. + * + * @remarks The as-user feature isn't supported/implemented on all platforms and + * will cause a-yet-to-be-determined-error-status on these. + */ +RTR3DECL(int) RTProcCreateEx(const char *pszExec, const char * const *papszArgs, RTENV hEnv, uint32_t fFlags, + PCRTHANDLE phStdIn, PCRTHANDLE phStdOut, PCRTHANDLE phStdErr, const char *pszAsUser, + const char *pszPassword, PRTPROCESS phProcess); + +/** @name RTProcCreate and RTProcCreateEx flags + * @{ */ +/** Detach the child process from the parents process tree and process group, + * session or/and console (depends on the platform what's done applicable). + * + * The new process will not be a direct decendent of the parent and it will not + * be possible to wait for it, i.e. @a phProcess shall be NULL. */ +#define RTPROC_FLAGS_DETACHED RT_BIT(0) +/** Don't show the started process. + * This is a Windows (and maybe OS/2) concept, do not use on other platforms. */ +#define RTPROC_FLAGS_HIDDEN RT_BIT(1) +/** Use special code path for starting child processes from a service (daemon). + * This is a windows concept for dealing with the so called "Session 0" + * isolation which was introduced with Windows Vista. Do not use on other + * platforms. */ +#define RTPROC_FLAGS_SERVICE RT_BIT(2) +/** Suppress changing the process contract id for the child process + * on Solaris. Without this flag the contract id is always changed, as that's + * the more frequently used case. */ +#define RTPROC_FLAGS_SAME_CONTRACT RT_BIT(3) +/** Load user profile data when executing a process. + * This redefines the meaning of RTENV_DEFAULT to the profile environment. + * @remarks On non-windows platforms, the resulting environment maybe very + * different from what you see in your shell. Among other reasons, + * we cannot run shell profile scripts which typically sets up the + * environment. */ +#define RTPROC_FLAGS_PROFILE RT_BIT(4) +/** Create process without a console window. + * This is a Windows (and OS/2) concept, do not use on other platforms. */ +#define RTPROC_FLAGS_NO_WINDOW RT_BIT(5) +/** Search the PATH for the executable. */ +#define RTPROC_FLAGS_SEARCH_PATH RT_BIT(6) +/** Don't quote and escape arguments on Windows and similar platforms where a + * command line is passed to the child process instead of an argument vector, + * just join up argv with a space between each. Ignored on platforms + * passing argument the vector. */ +#define RTPROC_FLAGS_UNQUOTED_ARGS RT_BIT(7) +/** Consider hEnv an environment change record to be applied to RTENV_DEFAULT. + * If hEnv is RTENV_DEFAULT, the flag has no effect. */ +#define RTPROC_FLAGS_ENV_CHANGE_RECORD RT_BIT(8) +/** Valid flag mask. */ +#define RTPROC_FLAGS_VALID_MASK UINT32_C(0x1ff) +/** @} */ + + +/** + * Process exit reason. + */ +typedef enum RTPROCEXITREASON +{ + /** Normal exit. iStatus contains the exit code. */ + RTPROCEXITREASON_NORMAL = 1, + /** Any abnormal exit. iStatus is undefined. */ + RTPROCEXITREASON_ABEND, + /** Killed by a signal. The iStatus field contains the signal number. */ + RTPROCEXITREASON_SIGNAL +} RTPROCEXITREASON; + +/** + * Process exit status. + */ +typedef struct RTPROCSTATUS +{ + /** The process exit status if the exit was a normal one. */ + int iStatus; + /** The reason the process terminated. */ + RTPROCEXITREASON enmReason; +} RTPROCSTATUS; +/** Pointer to a process exit status structure. */ +typedef RTPROCSTATUS *PRTPROCSTATUS; +/** Pointer to a const process exit status structure. */ +typedef const RTPROCSTATUS *PCRTPROCSTATUS; + + +/** Flags for RTProcWait(). + * @{ */ +/** Block indefinitly waiting for the process to exit. */ +#define RTPROCWAIT_FLAGS_BLOCK 0 +/** Don't block, just check if the process have exited. */ +#define RTPROCWAIT_FLAGS_NOBLOCK 1 +/** @} */ + +/** + * Waits for a process, resumes on interruption. + * + * @returns VINF_SUCCESS when the status code for the process was collected and + * put in *pProcStatus. + * @returns VERR_PROCESS_NOT_FOUND if the specified process wasn't found. + * @returns VERR_PROCESS_RUNNING when the RTPROCWAIT_FLAGS_NOBLOCK and the + * process haven't exited yet. + * + * @param Process The process to wait for. + * @param fFlags The wait flags, any of the RTPROCWAIT_FLAGS_ \#defines. + * @param pProcStatus Where to store the exit status on success. + * Optional. + */ +RTR3DECL(int) RTProcWait(RTPROCESS Process, unsigned fFlags, PRTPROCSTATUS pProcStatus); + +/** + * Waits for a process, returns on interruption. + * + * @returns VINF_SUCCESS when the status code for the process was collected and + * put in *pProcStatus. + * @returns VERR_PROCESS_NOT_FOUND if the specified process wasn't found. + * @returns VERR_PROCESS_RUNNING when the RTPROCWAIT_FLAGS_NOBLOCK and the + * process haven't exited yet. + * @returns VERR_INTERRUPTED when the wait was interrupted by the arrival of a + * signal or other async event. + * + * @param Process The process to wait for. + * @param fFlags The wait flags, any of the RTPROCWAIT_FLAGS_ \#defines. + * @param pProcStatus Where to store the exit status on success. + * Optional. + */ +RTR3DECL(int) RTProcWaitNoResume(RTPROCESS Process, unsigned fFlags, PRTPROCSTATUS pProcStatus); + +/** + * Terminates (kills) a running process. + * + * @returns IPRT status code. + * @param Process The process to terminate. + */ +RTR3DECL(int) RTProcTerminate(RTPROCESS Process); + +/** + * Gets the processor affinity mask of the current process. + * + * @returns The affinity mask. + */ +RTR3DECL(uint64_t) RTProcGetAffinityMask(void); + +/** + * Gets the short process name. + * + * @returns Pointer to read-only name string. + */ +RTR3DECL(const char *) RTProcShortName(void); + +/** + * Gets the path to the executable image of the current process. + * + * @returns pszExecPath on success. NULL on buffer overflow or other errors. + * + * @param pszExecPath Where to store the path. + * @param cbExecPath The size of the buffer. + */ +RTR3DECL(char *) RTProcGetExecutablePath(char *pszExecPath, size_t cbExecPath); + +/** + * Daemonize the current process, making it a background process. + * + * The way this work is that it will spawn a detached / backgrounded / + * daemonized / call-it-what-you-want process that isn't a direct child of the + * current process. The spawned will have the same arguments a the caller, + * except that the @a pszDaemonizedOpt is appended to prevent that the new + * process calls this API again. + * + * The new process will have the standard handles directed to/from the + * bitbucket. + * + * @returns IPRT status code. On success it is normal for the caller to exit + * the process by returning from main(). + * + * @param papszArgs The argument vector of the calling process. + * @param pszDaemonizedOpt The daemonized option. This is appended to the + * end of the parameter list of the daemonized process. + */ +RTR3DECL(int) RTProcDaemonize(const char * const *papszArgs, const char *pszDaemonizedOpt); + +/** + * Daemonize the current process, making it a background process. The current + * process will exit if daemonizing is successful. + * + * @returns IPRT status code. On success it will only return in the child + * process, the parent will exit. On failure, it will return in the + * parent process and no child has been spawned. + * + * @param fNoChDir Pass false to change working directory to "/". + * @param fNoClose Pass false to redirect standard file streams to the null device. + * @param pszPidfile Path to a file to write the process id of the daemon + * process to. Daemonizing will fail if this file already + * exists or cannot be written. May be NULL. + */ +RTR3DECL(int) RTProcDaemonizeUsingFork(bool fNoChDir, bool fNoClose, const char *pszPidfile); + +/** + * Check if the given process is running on the system. + * + * This check is case sensitive on most systems, except for Windows, OS/2 and + * Darwin. + * + * @returns true if the process is running & false otherwise. + * @param pszName Process name to search for. If no path is given only the + * filename part of the running process set will be + * matched. If a path is specified, the full path will be + * matched. + */ +RTR3DECL(bool) RTProcIsRunningByName(const char *pszName); + +/** + * Queries the parent process ID. + * + * @returns IPRT status code + * @param hProcess The process to query the parent of. + * @param phParent Where to return the parent process ID. + */ +RTR3DECL(int) RTProcQueryParent(RTPROCESS hProcess, PRTPROCESS phParent); + +/** + * Query the username of the given process. + * + * @returns IPRT status code. + * @retval VERR_BUFFER_OVERFLOW if the given buffer size is to small for the username. + * @param hProcess The process handle to query the username for. + * NIL_PROCESS is an alias for the current process. + * @param pszUser Where to store the user name on success. + * @param cbUser The size of the user name buffer. + * @param pcbUser Where to store the username length on success + * or the required buffer size if VERR_BUFFER_OVERFLOW + * is returned. + */ +RTR3DECL(int) RTProcQueryUsername(RTPROCESS hProcess, char *pszUser, size_t cbUser, size_t *pcbUser); + +/** + * Query the username of the given process allocating the string for the username. + * + * @returns IPRT status code. + * @param hProcess The process handle to query the username for. + * @param ppszUser Where to store the pointer to the string containing + * the username on success. Free with RTStrFree(). + */ +RTR3DECL(int) RTProcQueryUsernameA(RTPROCESS hProcess, char **ppszUser); + +#endif /* IN_RING3 */ + +/** @} */ + +RT_C_DECLS_END + +#endif /* !IPRT_INCLUDED_process_h */ + |