top.h

linux下获取一些环境信息的代码

// top.h - Header file:         show Linux processes
//
// Copyright (c) 2002, by:      James C. Warner
//    All rights reserved.      8921 Hilloway Road
//                              Eden Prairie, Minnesota 55347 USA
//                             <[e-mail]>
//
// This file may be used subject to the terms and conditions of the
// GNU Library General Public License Version 2, or any later version
// at your option, as published by the Free Software Foundation.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Library General Public License for more details.
// 
// For their contributions to this program, the author wishes to thank:
//    Albert D. Cahalan, <[e-mail]>
//    Craig Small, <[e-mail]>
//
// Changes by Albert Cahalan, 2002, 2004.

#ifndef _Itop
#define _Itop

// Defines intended to be experimented with ------------------------
//#define CASEUP_HEXES    // show any hex values in upper case
//#define CASEUP_SCALE    // show scaled time/num suffix upper case
//#define CASEUP_SUMMK    // show memory summary kilobytes with 'K'
//#define SORT_SUPRESS    // *attempt* to reduce qsort overhead
//#define WARN_NOT_SMP    // restrict '1' & 'I' commands to true smp

// Development/Debugging defines -----------------------------------
//#define ATEOJ_REPORT    // report a bunch of stuff, at end-of-job
//#define PRETEND2_5_X    // pretend we're linux 2.5.x (for IO-wait)
//#define PRETENDNOCAP    // use a terminal without essential caps
//#define STDOUT_IOLBF    // disable our own stdout _IOFBF override

#ifdef PRETEND2_5_X
#define linux_version_code LINUX_VERSION(2,5,43)
#endif

/*######  Some Miscellaneous constants  ##################################*/

// The default delay twix updates
#define DEF_DELAY  3.0

// The length of time a 'message' is displayed
#define MSG_SLEEP  2

// The default value for the 'k' (kill) request
#define DEF_SIGNAL  SIGTERM

// Specific process id monitoring support (command line only)
#define MONPIDMAX  20

// Power-of-two sizes lead to trouble; the largest power of
// two factor should be the cache line size. It'll mean the
// array indexing math gets slower, but cache aliasing is
// avoided.
#define CACHE_TWEAK_FACTOR 64

// Miscellaneous buffer sizes with liberal values -- mostly
// just to pinpoint source code usage/dependancies
#define SCREENMAX ( 512 + CACHE_TWEAK_FACTOR)
// the above might seem pretty stingy, until you consider that with every
// one of top's fields displayed we're talking a 160 byte column header --
// so that will provide for all fields plus a 350+ byte command line
#define WINNAMSIZ     4
#define CAPTABMAX     9
#define PFLAGSSIZ    32
#define CAPBUFSIZ    32
#define CLRBUFSIZ    64
#define GETBUFSIZ    32
#define TNYBUFSIZ    32
#define SMLBUFSIZ ( 256 + CACHE_TWEAK_FACTOR)
#define OURPATHSZ (1024 + CACHE_TWEAK_FACTOR)
#define MEDBUFSIZ (1024 + CACHE_TWEAK_FACTOR)
#define BIGBUFSIZ (2048 + CACHE_TWEAK_FACTOR)
#define USRNAMSIZ  GETBUFSIZ
#define ROWBUFSIZ  SCREENMAX + CLRBUFSIZ


/*######  Some Miscellaneous Macro definitions  ##########################*/

// Yield table size as 'int'
#define MAXTBL(t)  (int)(sizeof(t) / sizeof(t[0]))

// Used as return arguments in *some* of the sort callbacks
#define SORT_lt  ( Frame_srtflg > 0 ?  1 : -1 )
#define SORT_gt  ( Frame_srtflg > 0 ? -1 :  1 )
#define SORT_eq  0

// Used to create *most* of the sort callback functions
#define SCB_NUM1(f,n) \
   static int sort_ ## f (const proc_t **P, const proc_t **Q) { \
      if (        (*P)->n < (*Q)->n  ) return SORT_lt; \
      if (likely( (*P)->n > (*Q)->n )) return SORT_gt; \
      return SORT_eq; }
#define SCB_NUM2(f,n1,n2) \
   static int sort_ ## f (const proc_t **P, const proc_t **Q) { \
      if (        ((*P)->n1 - (*P)->n2) < ((*Q)->n1 - (*Q)->n2)  ) return SORT_lt; \
      if (likely( ((*P)->n1 - (*P)->n2) > ((*Q)->n1 - (*Q)->n2) )) return SORT_gt; \
      return SORT_eq; }
#define SCB_NUMx(f,n) \
   static int sort_ ## f (const proc_t **P, const proc_t **Q) { \
      return Frame_srtflg * ( (*Q)->n - (*P)->n ); }
#define SCB_STRx(f,s) \
   static int sort_ ## f (const proc_t **P, const proc_t **Q) { \
      return Frame_srtflg * strcmp((*Q)->s, (*P)->s); }

// The following two macros are used to 'inline' those portions of the
// display process requiring formatting, while protecting against any
// potential embedded 'millesecond delay' escape sequences.

// PUTT - Put to Tty (used in many places)
// - for temporary, possibly interactive, 'replacement' output
// - may contain ANY valid terminfo escape sequences
// - need NOT represent an entire screen row
#define PUTT(fmt,arg...) do { \
      char _str[ROWBUFSIZ]; \
      snprintf(_str, sizeof(_str), fmt, ## arg); \
      putp(_str); \
   } while (0)

// PUFF - Put for Frame (used in only 3 places)
// - for more permanent frame-oriented 'update' output
// - may NOT contain cursor motion terminfo escapes
// - assumed to represent a complete screen ROW
// - subject to optimization, thus MAY be discarded

// The evil version   (53892 byte stripped top, oddly enough)
#define _PUFF(fmt,arg...)                               \
do {                                                     \
   char _str[ROWBUFSIZ];                                   \
   int _len = 1 + snprintf(_str, sizeof(_str), fmt, ## arg);   \
   putp ( Batch ? _str :                                   \
   ({                                                 \
      char *restrict const _pse = &Pseudo_scrn[Pseudo_row++ * Pseudo_cols];  \
      memcmp(_pse, _str, _len) ? memcpy(_pse, _str, _len) : "\n";  \
   })                                \
   );                   \
} while (0)

// The good version  (53876 byte stripped top)
#define PUFF(fmt,arg...)                               \
do {                                                     \
   char _str[ROWBUFSIZ];                                   \
   char *_ptr;                                               \
   int _len = 1 + snprintf(_str, sizeof(_str), fmt, ## arg);   \
   if (Batch) _ptr = _str;                                   \
   else {                                                 \
      _ptr = &Pseudo_scrn[Pseudo_row++ * Pseudo_cols];  \
      if (memcmp(_ptr, _str, _len)) {                \
         memcpy(_ptr, _str, _len);                \
      } else {                                 \
         _ptr = "\n";                       \
      }                                 \
   }                                \
   putp(_ptr);                   \
} while (0)


/*------  Special Macros (debug and/or informative)  ---------------------*/

// Orderly end, with any sort of message - see fmtmk
#define debug_END(s) { \
           static void std_err (const char *); \
           fputs(Cap_clr_scr, stdout); \
           std_err(s); \
        }

// A poor man's breakpoint, if he's too lazy to learn gdb
#define its_YOUR_fault { *((char *)0) = '!'; }


/*######  Some Typedef's and Enum's  #####################################*/

// This typedef just ensures consistent 'process flags' handling
typedef unsigned FLG_t;

// These typedefs attempt to ensure consistent 'ticks' handling
typedef unsigned long long TIC_t;
typedef          long long SIC_t;

// Sort support, callback funtion signature
typedef int (*QFP_t)(const void *, const void *);

// This structure consolidates the information that's used
// in a variety of display roles.
typedef struct FLD_t {
   const char    keys [4];      // order: New-on New-off Old-on Old-off
   // misaligned on 64-bit, but part of a table -- oh well
   const char   *head;          // name for col heads + toggle/reorder fields
   const char   *fmts;          // sprintf format string for field display
   const int     width;         // field width, if applicable
   const int     scale;         // scale_num type, if applicable
   const QFP_t   sort;          // sort function
   const char   *desc;          // description for toggle/reorder fields
   const int     lflg;          // PROC_FILLxxx flag(s) needed by this field
} FLD_t;

// This structure stores one piece of critical 'history'
// information from one frame to the next -- we don't calc
// and save data that goes unused
typedef struct HST_t {
   TIC_t tics;
   int   pid;
} HST_t;

// This structure stores a frame's cpu tics used in history
// calculations.  It exists primarily for SMP support but serves
// all environments.
typedef struct CPU_t {
   TIC_t u, n, s, i, w, x, y, z; // as represented in /proc/stat
   TIC_t u_sav, s_sav, n_sav, i_sav, w_sav, x_sav, y_sav, z_sav; // in the order of our display
   unsigned id;  // the CPU ID number
} CPU_t;

// These 2 types support rcfile compatibility
typedef struct RCW_t {  // the 'window' portion of an rcfile
   FLG_t  sortindx;             // sort field, represented as a procflag
   int    winflags,             // 'view', 'show' and 'sort' mode flags
          maxtasks,             // user requested maximum, 0 equals all
          summclr,                      // color num used in summ info
          msgsclr,                      //        "       in msgs/pmts
          headclr,                      //        "       in cols head
          taskclr;                      //        "       in task rows
   char   winname [WINNAMSIZ],          // window name, user changeable
          fieldscur [PFLAGSSIZ];        // fields displayed and ordered
} RCW_t;

typedef struct RCF_t {  // the complete rcfile (new style)
   int    mode_altscr;          // 'A' - Alt display mode (multi task windows)
   int    mode_irixps;          // 'I' - Irix vs. Solaris mode (SMP-only)
   float  delay_time;           // 'd' or 's' - How long to sleep twixt updates
   int    win_index;            // Curwin, as index
   RCW_t  win [4];              // a 'WIN_t.rc' for each of the 4 windows
} RCF_t;

// The scaling 'type' used with scale_num() -- this is how
// the passed number is interpreted should scaling be necessary
enum scale_num {
   SK_no, SK_Kb, SK_Mb, SK_Gb, SK_Tb
};

// Flags for each possible field
enum pflag {
   P_PID, P_PPD, P_URR, P_UID, P_URE, P_GRP, P_TTY,
   P_PRI, P_NCE,
   P_CPN, P_CPU, P_TME, P_TM2,
   P_MEM, P_VRT, P_SWP, P_RES, P_COD, P_DAT, P_SHR,
   P_FLT, P_DRT,
   P_STA, P_CMD, P_WCH, P_FLG
};


///////////////////////////////////////////////////////////////////////////
// Special Section: multiple windows/field groups  -------------
// (kind of a header within a header:  constants, macros & types)

#define GROUPSMAX  4            // the max number of simultaneous windows
#define GRPNAMSIZ  WINNAMSIZ+2  // window's name + number as in: '#:...'

#define Flags_TOG  1            // these are used to direct wins_reflag
#define Flags_SET  2
#define Flags_OFF  3

// The Persistent 'Mode' flags!
// These are preserved in the rc file, as a single integer and the
// letter shown is the corresponding 'command' toggle

// 'View_' flags affect the summary (minimum), taken from 'Curwin'
#define View_CPUSUM  0x8000     // '1' - show combined cpu stats (vs. each)
#define View_LOADAV  0x4000     // 'l' - display load avg and uptime summary
#define View_STATES  0x2000     // 't' - display task/cpu(s) states summary
#define View_MEMORY  0x1000     // 'm' - display memory summary
#define View_NOBOLD  0x0001     // 'B' - disable 'bold' attribute globally

// 'Show_' & 'Qsrt_' flags are for task display in a visible window
#define Show_THREADS 0x10000    // 'H' - show threads in each task
#define Show_COLORS  0x0800     // 'z' - show in color (vs. mono)
#define Show_HIBOLD  0x0400     // 'b' - rows and/or cols bold (vs. reverse)
#define Show_HICOLS  0x0200     // 'x' - show sort column highlighted
#define Show_HIROWS  0x0100     // 'y' - show running tasks highlighted