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v4.0.1
library/include/readproc.h
288 строк
16 KB
Jim Warner
library: address an 'uninitialised value' VALGRIND bug
12 сен 2022, 15:15
12 сен 2022, 15:15
046883b
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#ifndef PROCPS_PROC_READPROC_H #define PROCPS_PROC_READPROC_H // New Interface to Process Table -- PROCTAB Stream (a la Directory streams) // Copyright 1996 Charles L. Blake. // Copyright 1998 Michael K. Johnson // Copyright 1998-2003 Albert Cahalan // May be distributed under the terms of the // GNU Library General Public License, a copy of which is provided // in the file COPYING #include <sys/types.h> #include <dirent.h> #include <unistd.h> #include "misc.h" // the following is development only, forcing display of "[ duplicate ENUM ]" strings // #define FALSE_THREADS /* set most child string fields to NULL */ // This is to help document a transition from pid to tgid/tid caused // by the introduction of thread support. It is used in cases where // neither tgid nor tid seemed correct. (in other words, FIXME) #define XXXID tid // Basic data structure which holds all information we can get about a process. // (unless otherwise specified, fields are read from /proc/#/stat) // // Most of it comes from task_struct in linux/sched.h // typedef struct proc_t { int tid, // (special) task id, the POSIX thread ID (see also: tgid) ppid; // stat,status pid of parent process char state, // stat,status single-char code for process state (S=sleeping) pad_1, // n/a padding pad_2, // n/a padding pad_3; // n/a padding unsigned long long utime, // stat user-mode CPU time accumulated by process stime, // stat kernel-mode CPU time accumulated by process cutime, // stat cumulative utime of process and reaped children cstime, // stat cumulative stime of process and reaped children start_time, // stat start time of process -- seconds since system boot blkio_tics, // stat time spent waiting for block IO gtime, // stat guest time of the task in jiffies cgtime; // stat guest time of the task children in jiffies int // next 3 fields are NOT filled in by readproc pcpu, // stat (special) elapsed tics for %CPU usage calculation maj_delta, // stat (special) major page faults since last update min_delta; // stat (special) minor page faults since last update char // Linux 2.1.7x and up have 64 signals. Allow 64, plus '\0' and padding. signal[18], // status mask of pending signals blocked[18], // status mask of blocked signals sigignore[18], // status mask of ignored signals sigcatch[18], // status mask of caught signals _sigpnd[18]; // status mask of PER TASK pending signals unsigned long start_code, // stat address of beginning of code segment end_code, // stat address of end of code segment start_stack, // stat address of the bottom of stack for the process kstk_esp, // stat kernel stack pointer kstk_eip, // stat kernel instruction pointer wchan, // stat (special) address of kernel wait channel proc is sleeping in rss, // stat identical to 'resident' alarm; // stat ? int priority, // stat kernel scheduling priority nice; // stat standard unix nice level of process unsigned long // the next 7 members come from /proc/#/statm size, // statm total virtual memory (as # pages) resident, // statm resident non-swapped memory (as # pages) share, // statm shared (mmap'd) memory (as # pages) trs, // statm text (exe) resident set (as # pages) lrs, // statm library resident set (always 0 w/ 2.6) drs, // statm data+stack resident set (as # pages) dt; // statm dirty pages (always 0 w/ 2.6) unsigned long vm_size, // status equals 'size' (as kb) vm_lock, // status locked pages (as kb) vm_rss, // status equals 'rss' and/or 'resident' (as kb) vm_rss_anon, // status the 'anonymous' portion of vm_rss (as kb) vm_rss_file, // status the 'file-backed' portion of vm_rss (as kb) vm_rss_shared, // status the 'shared' portion of vm_rss (as kb) vm_data, // status data only size (as kb) vm_stack, // status stack only size (as kb) vm_swap, // status based on linux-2.6.34 "swap ents" (as kb) vm_exe, // status equals 'trs' (as kb) vm_lib, // status total, not just used, library pages (as kb) vsize, // stat number of pages of virtual memory ... rss_rlim, // stat resident set size limit? flags, // stat kernel flags for the process min_flt, // stat number of minor page faults since process start maj_flt, // stat number of major page faults since process start cmin_flt, // stat cumulative min_flt of process and child processes cmaj_flt, // stat cumulative maj_flt of process and child processes rchar, // io characters read wchar, // io characters written syscr, // io number of read I/O operations syscw, // io number of write I/O operations read_bytes, // io number of bytes fetched from the storage layer write_bytes, // io number of bytes sent to the storage layer cancelled_write_bytes, // io number of bytes truncating pagecache smap_Rss, // smaps_rollup mapping currently resident in RAM smap_Pss, // " Rss divided by total processes sharing it smap_Pss_Anon, // " proportional share of 'anonymous' memory smap_Pss_File, // " proportional share of 'file' memory smap_Pss_Shmem, // " proportional share of 'shmem' memory smap_Shared_Clean, // " unmodified shared memory smap_Shared_Dirty, // " altered shared memory smap_Private_Clean, // " unmodified private memory smap_Private_Dirty, // " altered private memory smap_Referenced, // " memory marked as referenced/accessed smap_Anonymous, // " memory not belonging to any file smap_LazyFree, // " memory marked by madvise(MADV_FREE) smap_AnonHugePages, // " memory backed by transparent huge pages smap_ShmemPmdMapped, // " shmem/tmpfs memory backed by huge pages smap_FilePmdMapped, // " file memory backed by huge pages smap_Shared_Hugetlb, // " hugetlbfs backed memory *not* counted in Rss/Pss smap_Private_Hugetlb, // " hugetlbfs backed memory *not* counted in Rss/Pss smap_Swap, // " swapped would-be-anonymous memory (includes swapped out shmem) smap_SwapPss, // " the proportional share of 'Swap' (excludes swapped out shmem) smap_Locked; // " memory amount locked to RAM char *environ, // (special) environment as string (/proc/#/environ) *cmdline, // (special) command line as string (/proc/#/cmdline) *cgroup, // (special) cgroup as string (/proc/#/cgroup) *cgname, // (special) name portion of above (if possible) *supgid, // status supplementary gids as comma delimited str *supgrp, // supp grp names as comma delimited str, derived from supgid **environ_v, // (special) environment string vectors (/proc/#/environ) **cmdline_v, // (special) command line string vectors (/proc/#/cmdline) **cgroup_v; // (special) cgroup string vectors (/proc/#/cgroup) char *euser, // stat(),status effective user name *ruser, // status real user name *suser, // status saved user name *fuser, // status filesystem user name *rgroup, // status real group name *egroup, // status effective group name *sgroup, // status saved group name *fgroup, // status filesystem group name *cmd; // stat,status basename of executable file in call to exec(2) int rtprio, // stat real-time priority sched, // stat scheduling class pgrp, // stat process group id session, // stat session id nlwp, // stat,status number of threads, or 0 if no clue tgid, // (special) thread group ID, the POSIX PID (see also: tid) tty; // stat full device number of controlling terminal /* FIXME: int uids & gids should be uid_t or gid_t from pwd.h */ uid_t euid; gid_t egid; // stat(),status effective uid_t ruid; gid_t rgid; // status real uid_t suid; gid_t sgid; // status saved uid_t fuid; gid_t fgid; // status fs (used for file access only) int tpgid, // stat terminal process group id exit_signal, // stat might not be SIGCHLD processor; // stat current (or most recent?) CPU int oom_score, // oom_score (badness for OOM killer) oom_adj; // oom_adj (adjustment to OOM score) struct procps_ns ns; // (ns subdir) inode number of namespaces char *sd_mach, // n/a systemd vm/container name *sd_ouid, // n/a systemd session owner uid *sd_seat, // n/a systemd login session seat *sd_sess, // n/a systemd login session id *sd_slice, // n/a systemd slice unit *sd_unit, // n/a systemd system unit id *sd_uunit; // n/a systemd user unit id char *lxcname, // n/a lxc container name *exe; // exe executable path + name int luid, // loginuid user id at login autogrp_id, // autogroup autogroup number (id) autogrp_nice; // autogroup autogroup nice value } proc_t; // PROCTAB: data structure holding the persistent information readproc needs // from openproc(). The setup is intentionally similar to the dirent interface // and other system table interfaces (utmp+wtmp come to mind). #define PROCPATHLEN 64 // must hold /proc/2000222000/task/2000222000/cmdline typedef struct PROCTAB { DIR *procfs; // char deBug0[64]; DIR *taskdir; // for threads // char deBug1[64]; pid_t taskdir_user; // for threads int(*finder)(struct PROCTAB *__restrict const, proc_t *__restrict const); proc_t*(*reader)(struct PROCTAB *__restrict const, proc_t *__restrict const); int(*taskfinder)(struct PROCTAB *__restrict const, const proc_t *__restrict const, proc_t *__restrict const, char *__restrict const); proc_t*(*taskreader)(struct PROCTAB *__restrict const, proc_t *__restrict const, char *__restrict const); pid_t *pids; // pids of the procs uid_t *uids; // uids of procs int nuid; // cannot really sentinel-terminate unsigned short[] int i; // generic int hide_kernel; // getenv LIBPROC_HIDE_KERNEL was set unsigned flags; unsigned u; // generic void * vp; // generic char path[PROCPATHLEN]; // must hold /proc/2000222000/task/2000222000/cmdline unsigned pathlen; // length of string in the above (w/o '\0') } PROCTAB; // openproc/readproctab: // // Return PROCTAB* / *proc_t[] or NULL on error ((probably) "/proc" cannot be // opened.) By default readproc will consider all processes as valid to parse // and return, but not actually fill in the cmdline, environ, and /proc/#/statm // derived memory fields. // // `flags' (a bitwise-or of PROC_* below) modifies the default behavior. The // "fill" options will cause more of the proc_t to be filled in. The "filter" // options all use the second argument as the pointer to a list of objects: // process status', process id's, user id's. The third // argument is the length of the list (currently only used for lists of user // id's since uid_t supports no convenient termination sentinel.) #define PROC_FILLMEM 0x00000001 // read statm #define PROC_FILLARG 0x00000002 // alloc and fill in `cmdline' vectors #define PROC_FILLENV 0x00000004 // alloc and fill in `environ' vectors #define PROC_FILLUSR 0x00000008 // resolve user id number -> user name #define PROC_FILLGRP 0x00000010 // resolve group id number -> group name #define PROC_FILLSTATUS 0x00000020 // read status #define PROC_FILLSTAT 0x00000040 // read stat #define PROC_FILLCGROUP 0x00000080 // alloc and fill in `cgroup` vectors #define PROC_FILLOOM 0x00000100 // fill in proc_t oom_score and oom_adj #define PROC_FILLNS 0x00000200 // fill in proc_t namespace information #define PROC_FILLSYSTEMD 0x00000400 // fill in proc_t systemd information #define PROC_FILL_LXC 0x00000800 // fill in proc_t lxcname, if possible #define PROC_FILL_LUID 0x00001000 // fill in proc_t luid (login user id) #define PROC_FILL_EXE 0x00002000 // fill in proc_t exe path + pgm name #define PROC_FILLIO 0x00004000 // fill in proc_t io information #define PROC_FILLSMAPS 0x00008000 // fill in proc_t smaps_rollup stuff // consider only processes with one of the passed: #define PROC_PID 0x00010000 // process id numbers ( 0 terminated ) #define PROC_UID 0x00020000 // user id numbers ( length needed ) // Note: the above 2 values must NOT change without also changing pids.h !!! #define PROC_EDITCGRPCVT 0x00040000 // edit `cgroup' as regular string #define PROC_EDITCMDLCVT 0x00080000 // edit `cmdline' as regular string #define PROC_EDITENVRCVT 0x00100000 // edit `environ' as regular string // these three also require the PROC_FILLSTATUS flage #define PROC_FILL_OUSERS ( 0x00200000 | PROC_FILLSTATUS ) // obtain other user names #define PROC_FILL_OGROUPS ( 0x00400000 | PROC_FILLSTATUS ) // obtain other group names #define PROC_FILL_SUPGRP ( 0x00800000 | PROC_FILLSTATUS ) // obtain supplementary group names // and let's put new flags here ... #define PROC_FILLAUTOGRP 0x01000000 // fill in proc_t autogroup stuff // it helps to give app code a few spare bits #define PROC_SPARE_1 0x10000000 #define PROC_SPARE_2 0x20000000 #define PROC_SPARE_3 0x40000000 #define PROC_SPARE_4 0x80000000 // Function definitions // Initialize a PROCTAB structure holding needed call-to-call persistent data PROCTAB *openproc(unsigned flags, ... /* pid_t *| uid_t *| dev_t *| char *[, int n] */ ); // Retrieve the next process or task matching the criteria set by the openproc(). // // Note: When NULL is used as the readproc 'p' or readeither 'x' // parameter, the library will allocate the necessary proc_t storage. // // Alternatively, you may provide your own reuseable buffer address // in which case that buffer *MUST* be initialized to zero one time // only before first use. Thereafter, the library will manage such // a passed proc_t, freeing any additional acquired memory associated // with the previous process or thread. proc_t *readproc(PROCTAB *__restrict const PT, proc_t *__restrict p); proc_t *readeither(PROCTAB *__restrict const PT, proc_t *__restrict x); int look_up_our_self(void); void closeproc(PROCTAB *PT); char **vectorize_this_str(const char *src); #endif