pr_stat.c

Sun Solaris 10 中的 DTrace 组件的源代码。请参看: http://www.sun.com/software/solaris/observability.jsp

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only.
 * See the file usr/src/LICENSING.NOTICE in this distribution or
 * http://www.opensolaris.org/license/ for details.
 */

#pragma ident	"@(#)pr_stat.c	1.4	01/05/24 SMI"

#include <sys/isa_defs.h>

#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include "libproc.h"

#ifdef _LP64
/*
 * in case of 64-bit *stat() and *stat64 library call and 32-bit subject
 * process convert 64-bit struct stat/stat64 into 32-bit struct stat64
 */
static void
stat64_32_to_n(struct stat64_32 *src, struct stat *dest)
{
	(void) memset(dest, 0, sizeof (*dest));
	dest->st_dev = DEVEXPL(src->st_dev);
	dest->st_ino = (ino_t)src->st_ino;
	dest->st_mode = (mode_t)src->st_mode;
	dest->st_nlink = (nlink_t)src->st_nlink;
	dest->st_uid = (uid_t)src->st_uid;
	dest->st_gid = (gid_t)src->st_gid;
	dest->st_rdev = DEVEXPL(src->st_rdev);
	dest->st_size = (off_t)src->st_size;
	TIMESPEC32_TO_TIMESPEC(&dest->st_atim, &src->st_atim);
	TIMESPEC32_TO_TIMESPEC(&dest->st_mtim, &src->st_mtim);
	TIMESPEC32_TO_TIMESPEC(&dest->st_ctim, &src->st_ctim);
	dest->st_blksize = (blksize_t)src->st_blksize;
	dest->st_blocks = (blkcnt_t)src->st_blocks;
	(void) memcpy(dest->st_fstype, src->st_fstype,
	    sizeof (dest->st_fstype));
}
#endif	/* _LP64 */

/*
 * stat() system call -- executed by subject process
 */
int
pr_stat(struct ps_prochandle *Pr, const char *path, struct stat *buf)
{
	sysret_t rval;			/* return value from stat() */
	argdes_t argd[3];		/* arg descriptors for stat() */
	argdes_t *adp = &argd[0];	/* first argument */
	int syscall;			/* stat, xstat or stat64 */
	int nargs = 2;			/* number of actual arguments */
	int error;
#ifdef _LP64
	struct stat64_32 statb64_32;
#endif	/* _LP64 */

	if (Pr == NULL)		/* no subject process */
		return (stat(path, buf));

	/*
	 * This is filthy, but /proc reveals everything about the
	 * system call interfaces, despite what the architects of the
	 * header files may desire.  We have to know here whether we
	 * are calling stat() or xstat() in the subject.
	 */
#if defined(_STAT_VER)
	syscall = SYS_xstat;
	nargs = 3;
	adp->arg_value = _STAT_VER;
	adp->arg_object = NULL;
	adp->arg_type = AT_BYVAL;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = 0;
	adp++;			/* move to pathname argument */
#else
	if (Pstatus(Pr)->pr_dmodel != PR_MODEL_NATIVE) {
		/* 64-bit process controls 32-bit subject process */
		syscall = SYS_stat64;
	} else {
		syscall = SYS_stat;
	}
#endif

	adp->arg_value = 0;
	adp->arg_object = (void *)path;
	adp->arg_type = AT_BYREF;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = strlen(path) + 1;
	adp++;			/* move to buffer argument */

	adp->arg_value = 0;
	adp->arg_type = AT_BYREF;
	adp->arg_inout = AI_OUTPUT;
#ifdef _LP64
	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32) {
		adp->arg_object = &statb64_32;
		adp->arg_size = sizeof (statb64_32);
	} else {
		adp->arg_object = buf;
		adp->arg_size = sizeof (*buf);
	}
#else	/* _LP64 */
	adp->arg_object = buf;
	adp->arg_size = sizeof (*buf);
#endif	/* _LP64 */

	error = Psyscall(Pr, &rval, syscall, nargs, &argd[0]);

	if (error) {
		errno = (error > 0)? error : ENOSYS;
		return (-1);
	}
#ifdef _LP64
	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32)
		stat64_32_to_n(&statb64_32, buf);
#endif	/* _LP64 */
	return (0);
}

/*
 * lstat() system call -- executed by subject process
 */
int
pr_lstat(struct ps_prochandle *Pr, const char *path, struct stat *buf)
{
	sysret_t rval;			/* return value from lstat() */
	argdes_t argd[3];		/* arg descriptors for lstat() */
	argdes_t *adp = &argd[0];	/* first argument */
	int syscall;			/* lstat, lxstat or lstat64 */
	int nargs = 2;			/* number of actual arguments */
	int error;
#ifdef _LP64
	struct stat64_32 statb64_32;
#endif	/* _LP64 */

	if (Pr == NULL)		/* no subject process */
		return (lstat(path, buf));

	/*
	 * This is filthy, but /proc reveals everything about the
	 * system call interfaces, despite what the architects of the
	 * header files may desire.  We have to know here whether we
	 * are calling lstat() or lxstat() in the subject.
	 */
#if defined(_STAT_VER)
	syscall = SYS_lxstat;
	nargs = 3;
	adp->arg_value = _STAT_VER;
	adp->arg_object = NULL;
	adp->arg_type = AT_BYVAL;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = 0;
	adp++;			/* move to pathname argument */
#else
	if (Pstatus(Pr)->pr_dmodel != PR_MODEL_NATIVE) {
		/* 64-bit process controls 32-bit subject process */
		syscall = SYS_lstat64;
	} else {
		syscall = SYS_lstat;
	}
#endif

	adp->arg_value = 0;
	adp->arg_object = (void *)path;
	adp->arg_type = AT_BYREF;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = strlen(path) + 1;
	adp++;			/* move to buffer argument */

	adp->arg_value = 0;
	adp->arg_type = AT_BYREF;
	adp->arg_inout = AI_OUTPUT;
#ifdef _LP64
	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32) {
		adp->arg_object = &statb64_32;
		adp->arg_size = sizeof (statb64_32);
	} else {
		adp->arg_object = buf;
		adp->arg_size = sizeof (*buf);
	}
#else	/* _LP64 */
	adp->arg_object = buf;
	adp->arg_size = sizeof (*buf);
#endif	/* _LP64 */

	error = Psyscall(Pr, &rval, syscall, nargs, &argd[0]);

	if (error) {
		errno = (error > 0)? error : ENOSYS;
		return (-1);
	}
#ifdef _LP64
	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32)
		stat64_32_to_n(&statb64_32, buf);
#endif	/* _LP64 */
	return (0);
}

/*
 * fstat() system call -- executed by subject process
 */
int
pr_fstat(struct ps_prochandle *Pr, int fd, struct stat *buf)
{
	sysret_t rval;			/* return value from fstat() */
	argdes_t argd[3];		/* arg descriptors for fstat() */
	argdes_t *adp = &argd[0];	/* first argument */
	int syscall;			/* fstat, fxstat or fstat64 */
	int nargs = 2;			/* number of actual arguments */
	int error;
#ifdef _LP64
	struct stat64_32 statb64_32;
#endif	/* _LP64 */

	if (Pr == NULL)		/* no subject process */
		return (fstat(fd, buf));

	/*
	 * This is filthy, but /proc reveals everything about the
	 * system call interfaces, despite what the architects of the
	 * header files may desire.  We have to know here whether we
	 * are calling fstat() or fxstat() in the subject.
	 */
#if defined(_STAT_VER)
	syscall = SYS_fxstat;
	nargs = 3;
	adp->arg_value = _STAT_VER;
	adp->arg_object = NULL;
	adp->arg_type = AT_BYVAL;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = 0;
	adp++;			/* move to fd argument */
#else
	if (Pstatus(Pr)->pr_dmodel != PR_MODEL_NATIVE) {
		/* 64-bit process controls 32-bit subject process */
		syscall = SYS_fstat64;
	} else {
		syscall = SYS_fstat;
	}
#endif

	adp->arg_value = fd;
	adp->arg_object = NULL;
	adp->arg_type = AT_BYVAL;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = 0;
	adp++;			/* move to buffer argument */

	adp->arg_value = 0;
	adp->arg_type = AT_BYREF;
	adp->arg_inout = AI_OUTPUT;
#ifdef _LP64
	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32) {
		adp->arg_object = &statb64_32;
		adp->arg_size = sizeof (statb64_32);
	} else {
		adp->arg_object = buf;
		adp->arg_size = sizeof (*buf);
	}
#else	/* _LP64 */
	adp->arg_object = buf;
	adp->arg_size = sizeof (*buf);
#endif	/* _LP64 */

	error = Psyscall(Pr, &rval, syscall, nargs, &argd[0]);

	if (error) {
		errno = (error > 0)? error : ENOSYS;
		return (-1);
	}
#ifdef _LP64
	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32)
		stat64_32_to_n(&statb64_32, buf);
#endif	/* _LP64 */
	return (0);
}

/*
 * stat64() system call -- executed by subject process
 */
int
pr_stat64(struct ps_prochandle *Pr, const char *path, struct stat64 *buf)
{
	sysret_t rval;			/* return value from stat64() */
	argdes_t argd[2];		/* arg descriptors for stat64() */
	argdes_t *adp = &argd[0];	/* first argument */
	int syscall;			/* stat or stat64 */
	int nargs = 2;			/* number of actual arguments */
	int error;
#ifdef _LP64
	struct stat64_32 statb64_32;
#endif	/* _LP64 */

	if (Pr == NULL)		/* no subject process */
		return (stat64(path, buf));

	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32) {
		/*
		 * 32-bit native and
		 * 64-bit process controls 32-bit subject process
		 */
		syscall = SYS_stat64;
	} else {
		/* 64-bit native */
		syscall = SYS_stat;
	}

	adp->arg_value = 0;
	adp->arg_object = (void *)path;
	adp->arg_type = AT_BYREF;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = strlen(path) + 1;
	adp++;			/* move to buffer argument */

	adp->arg_value = 0;
	adp->arg_type = AT_BYREF;
	adp->arg_inout = AI_OUTPUT;
#ifdef _LP64
	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32) {
		adp->arg_object = &statb64_32;
		adp->arg_size = sizeof (statb64_32);
	} else {
		adp->arg_object = buf;
		adp->arg_size = sizeof (*buf);
	}
#else	/* _LP64 */
	adp->arg_object = buf;
	adp->arg_size = sizeof (*buf);
#endif	/* _LP64 */

	error = Psyscall(Pr, &rval, syscall, nargs, &argd[0]);

	if (error) {
		errno = (error > 0)? error : ENOSYS;
		return (-1);
	}
#ifdef _LP64
	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32)
		stat64_32_to_n(&statb64_32, (struct stat *)buf);
#endif	/* _LP64 */
	return (0);
}

/*
 * lstat64() system call -- executed by subject process
 */
int
pr_lstat64(struct ps_prochandle *Pr, const char *path, struct stat64 *buf)
{
	sysret_t rval;			/* return value from lstat64() */
	argdes_t argd[2];		/* arg descriptors for lstat64() */
	argdes_t *adp = &argd[0];	/* first argument */
	int syscall;			/* lstat or lstat64 */
	int nargs = 2;			/* number of actual arguments */
	int error;
#ifdef _LP64
	struct stat64_32 statb64_32;
#endif	/* _LP64 */

	if (Pr == NULL)		/* no subject process */
		return (lstat64(path, buf));

	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32) {
		/*
		 * 32-bit native and
		 * 64-bit process controls 32-bit subject process
		 */
		syscall = SYS_lstat64;
	} else {
		/* 64-bit native */
		syscall = SYS_lstat;
	}

	adp->arg_value = 0;
	adp->arg_object = (void *)path;
	adp->arg_type = AT_BYREF;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = strlen(path) + 1;
	adp++;			/* move to buffer argument */

	adp->arg_value = 0;
	adp->arg_type = AT_BYREF;
	adp->arg_inout = AI_OUTPUT;
#ifdef _LP64
	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32) {
		adp->arg_object = &statb64_32;
		adp->arg_size = sizeof (statb64_32);
	} else {
		adp->arg_object = buf;
		adp->arg_size = sizeof (*buf);
	}
#else	/* _LP64 */
	adp->arg_object = buf;
	adp->arg_size = sizeof (*buf);
#endif	/* _LP64 */

	error = Psyscall(Pr, &rval, syscall, nargs, &argd[0]);

	if (error) {
		errno = (error > 0)? error : ENOSYS;
		return (-1);
	}
#ifdef _LP64
	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32)
		stat64_32_to_n(&statb64_32, (struct stat *)buf);
#endif	/* _LP64 */
	return (0);
}

/*
 * fstat64() system call -- executed by subject process
 */
int
pr_fstat64(struct ps_prochandle *Pr, int fd, struct stat64 *buf)
{
	sysret_t rval;			/* return value from fstat64() */
	argdes_t argd[2];		/* arg descriptors for fstat64() */
	argdes_t *adp = &argd[0];	/* first argument */
	int syscall;			/* fstat or fstat64 */
	int nargs = 2;			/* number of actual arguments */
	int error;
#ifdef _LP64
	struct stat64_32 statb64_32;
#endif	/* _LP64 */

	if (Pr == NULL)		/* no subject process */
		return (fstat64(fd, buf));

	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32) {
		/*
		 * 32-bit native and
		 * 64-bit process controls 32-bit subject process
		 */
		syscall = SYS_fstat64;
	} else {
		/* 64-bit native */
		syscall = SYS_fstat;
	}

	adp->arg_value = fd;
	adp->arg_object = NULL;
	adp->arg_type = AT_BYVAL;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = 0;
	adp++;			/* move to buffer argument */

	adp->arg_value = 0;
	adp->arg_type = AT_BYREF;
	adp->arg_inout = AI_OUTPUT;
#ifdef _LP64
	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32) {
		adp->arg_object = &statb64_32;
		adp->arg_size = sizeof (statb64_32);
	} else {
		adp->arg_object = buf;
		adp->arg_size = sizeof (*buf);
	}
#else	/* _LP64 */
	adp->arg_object = buf;
	adp->arg_size = sizeof (*buf);
#endif	/* _LP64 */

	error = Psyscall(Pr, &rval, syscall, nargs, &argd[0]);

	if (error) {
		errno = (error > 0)? error : ENOSYS;
		return (-1);
	}
#ifdef _LP64
	if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32)
		stat64_32_to_n(&statb64_32, (struct stat *)buf);
#endif	/* _LP64 */
	return (0);
}