[Mac OS X] Liste des processus via sysctl

**sinfoni** · 04/05/2010, 14h41

Bonjour,

Je souhaite récupérer la liste des processus sous Mac OS X. Pour ça, j'utilise le code suivant:

Code :

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function GetProcess : integer;
var
i: integer;
mib : array [0..2] of Cint;
len: cint;
kp: PChar;
 
begin
    // On dit ce qu'on souhaite récupérer
    mib[0] := CTL_KERN;
    mib[1] := KERN_PROC;
    mib[2] := KERN_PROC_ALL;
    //mib[3] := 0;
    len := 0;
   //Un premier appel "à vide" donne la taille des infos disponibles
    if (sysctl.FPsysctl(PChar(@mib), 3, nil, @len, NIL, 0) <> -1) then begin     
        if (len > 0) then begin
            kp := StrAlloc(len);
            // Le second appel récupère les infos disponibles
            if (sysctl.FPsysctl(PChar(@mib), 3, kp, @len, NIL, 0) <> -1) then begin    
 
                // Structure kp bien remplie mais comment retrouver mes petits ? 
 
            end;
            strdispose(kp);
        end;
     end;
end;

Le code fonctionne, si je bidouille en lisant kp caractère par caractère, je retouve bien des noms de processus ça et là. Ce kp est censé avoir cette structure:

Code :

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struct kinfo_proc {
	struct	extern_proc kp_proc;			/* proc structure */
	struct	eproc {
		struct	proc *e_paddr;		/* address of proc */
		struct	session *e_sess;	/* session pointer */
		struct	_pcred e_pcred;		/* process credentials */
		struct	_ucred e_ucred;		/* current credentials */
		struct	 vmspace e_vm;		/* address space */
		pid_t	e_ppid;			/* parent process id */
		pid_t	e_pgid;			/* process group id */
		short	e_jobc;			/* job control counter */
		dev_t	e_tdev;			/* controlling tty dev */
		pid_t	e_tpgid;		/* tty process group id */
		struct	session *e_tsess;	/* tty session pointer */
#define	WMESGLEN	7
		char	e_wmesg[WMESGLEN+1];	/* wchan message */
		segsz_t e_xsize;		/* text size */
		short	e_xrssize;		/* text rss */
		short	e_xccount;		/* text references */
		short	e_xswrss;
		int32_t	e_flag;
#define	EPROC_CTTY	0x01	/* controlling tty vnode active */
#define	EPROC_SLEADER	0x02	/* session leader */
#define	COMAPT_MAXLOGNAME	12
		char	e_login[COMAPT_MAXLOGNAME];	/* short setlogin() name */
		int32_t	e_spare[4];
	} kp_eproc;
};

avec extern_proc défini ainsi:

Code :

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struct extern_proc {
	union {
		struct {
			struct	proc *__p_forw;	/* Doubly-linked run/sleep queue. */
			struct	proc *__p_back;
		} p_st1;
		struct timeval __p_starttime; 	/* process start time */
	} p_un;
#define p_forw p_un.p_st1.__p_forw
#define p_back p_un.p_st1.__p_back
#define p_starttime p_un.__p_starttime
	struct	vmspace *p_vmspace;	/* Address space. */
	struct	sigacts *p_sigacts;	/* Signal actions, state (PROC ONLY). */
	int	p_flag;			/* P_* flags. */
	char	p_stat;			/* S* process status. */
	pid_t	p_pid;			/* Process identifier. */
	pid_t	p_oppid;	 /* Save parent pid during ptrace. XXX */
	int	p_dupfd;	 /* Sideways return value from fdopen. XXX */
	/* Mach related  */
	caddr_t user_stack;	/* where user stack was allocated */
	void	*exit_thread;	/* XXX Which thread is exiting? */
	int		p_debugger;		/* allow to debug */
	boolean_t	sigwait;	/* indication to suspend */
	/* scheduling */
	u_int	p_estcpu;	 /* Time averaged value of p_cpticks. */
	int	p_cpticks;	 /* Ticks of cpu time. */
	fixpt_t	p_pctcpu;	 /* %cpu for this process during p_swtime */
	void	*p_wchan;	 /* Sleep address. */
	char	*p_wmesg;	 /* Reason for sleep. */
	u_int	p_swtime;	 /* Time swapped in or out. */
	u_int	p_slptime;	 /* Time since last blocked. */
	struct	itimerval p_realtimer;	/* Alarm timer. */
	struct	timeval p_rtime;	/* Real time. */
	u_quad_t p_uticks;		/* Statclock hits in user mode. */
	u_quad_t p_sticks;		/* Statclock hits in system mode. */
	u_quad_t p_iticks;		/* Statclock hits processing intr. */
	int	p_traceflag;		/* Kernel trace points. */
	struct	vnode *p_tracep;	/* Trace to vnode. */
	int	p_siglist;		/* DEPRECATED */
	struct	vnode *p_textvp;	/* Vnode of executable. */
	int	p_holdcnt;		/* If non-zero, don't swap. */
	sigset_t p_sigmask;	/* DEPRECATED. */
	sigset_t p_sigignore;	/* Signals being ignored. */
	sigset_t p_sigcatch;	/* Signals being caught by user. */
	u_char	p_priority;	/* Process priority. */
	u_char	p_usrpri;	/* User-priority based on p_cpu and p_nice. */
	char	p_nice;		/* Process "nice" value. */
	char	p_comm[MAXCOMLEN+1];
	struct 	pgrp *p_pgrp;	/* Pointer to process group. */
	struct	user *p_addr;	/* Kernel virtual addr of u-area (PROC ONLY). */
	u_short	p_xstat;	/* Exit status for wait; also stop signal. */
	u_short	p_acflag;	/* Accounting flags. */
	struct	rusage *p_ru;	/* Exit information. XXX */
};

Le C n'étant pas ma tasse de thé... comment je m'y retrouve pour récupérer proprement le nom des processus dans un kp de type kinfo_proc ...

Merci,
André.

**M.Dlb** · 04/05/2010, 15h58

Il suffit de voir à quelle offset dans le PChar kp commence le nom du processus. Si tu postes un dump en hexa de kp, on devrait pouvoir t'aider à voir quel est le champ correspondant. Attention à l'alignement mémoire quand on dépiote ce genre de structure

**sinfoni** · 04/05/2010, 18h00

Ok. Là je suis parti en déplacement. Je post un dump demain dans la matinée

**sinfoni** · 05/05/2010, 09h50

Pas sûr que ça aide vraiment...

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**M.Dlb** · 05/05/2010, 11h13

Effectivement, ca aide pas trop

Sinon selon cette doc, le paramètre qui contient le nom est p_comm de extern_proc:

http://developer.apple.com/mac/libra...01/qa1123.html

**sinfoni** · 05/05/2010, 11h15

Tout à fait, je suis parti de cette doc pour faire le programme Delphi. Mais sans la structure convertie en Delphi, je ne suis pas plus avancé. Bon, maintenant ça fonctionne : Je ne traite que les caractères imprimable et à priori, je connais le nom du processus que je cherche, mais c'est pas très propre...

**M.Dlb** · 05/05/2010, 11h48

Si la structure n'existe pas en Delphi, le plus simple pour récupérer proprement les infos est de recréer cette structure en Pascal. Attention encore une fois à l'alignement mémoire.

Sinon une autre solution serait de déterminer l'offset de début de p_comm, puis de lire MAXCOMLEN octets à partir de cet offset. Pour cela, l'idéal est de passer par les codes hexa, et d'essayer, manuellement et un par un, de faire correspondre les champs de la structure avec les infos contenues dans kp. Bien évidemment, il faut dumper le PChar en binaire.

[Mac OS X] Liste des processus via sysctl

Free Pascal

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