usr/src/lib/libproc/common/pr_open.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include <stdlib.h>
  28 #include <unistd.h>
  29 #include <string.h>
  30 #include <fcntl.h>
  31 #include <errno.h>
  32 #include "libproc.h"
  33
  34 /*
  35  * open() system call -- executed by subject process.
  36  */
  37 int
  38 pr_open(struct ps_prochandle *Pr, const char *filename, int flags, mode_t mode)
  39 {
  40         sysret_t rval;                  /* return value from openat() */
  41         argdes_t argd[4];               /* arg descriptors for openat() */
  42         argdes_t *adp;
  43         int error;
  44
  45         if (Pr == NULL)         /* no subject process */
  46                 return (open(filename, flags, mode));
  47
  48         adp = &argd[0];         /* AT_FDCWD argument */
  49         adp->arg_value = AT_FDCWD;
  50         adp->arg_object = NULL;
  51         adp->arg_type = AT_BYVAL;
  52         adp->arg_inout = AI_INPUT;
  53         adp->arg_size = 0;
  54
  55         adp++;                  /* filename argument */
  56         adp->arg_value = 0;
  57         adp->arg_object = (void *)filename;
  58         adp->arg_type = AT_BYREF;
  59         adp->arg_inout = AI_INPUT;
  60         adp->arg_size = strlen(filename)+1;
  61
  62         adp++;                  /* flags argument */
  63         adp->arg_value = (long)flags;
  64         adp->arg_object = NULL;
  65         adp->arg_type = AT_BYVAL;
  66         adp->arg_inout = AI_INPUT;
  67         adp->arg_size = 0;
  68
  69         adp++;                  /* mode argument */
  70         adp->arg_value = (long)mode;
  71         adp->arg_object = NULL;
  72         adp->arg_type = AT_BYVAL;
  73         adp->arg_inout = AI_INPUT;
  74         adp->arg_size = 0;
  75
  76         error = Psyscall(Pr, &rval, SYS_openat, 4, &argd[0]);
  77
  78         if (error) {
  79                 errno = (error > 0)? error : ENOSYS;
  80                 return (-1);
  81         }
  82         return (rval.sys_rval1);
  83 }
  84
  85 /*
  86  * creat() system call -- executed by subject process.
  87  */
  88 int
  89 pr_creat(struct ps_prochandle *Pr, const char *filename, mode_t mode)
  90 {
  91         sysret_t rval;                  /* return value from openat() */
  92         argdes_t argd[4];               /* arg descriptors for openat() */
  93         argdes_t *adp;
  94         int error;
  95
  96         if (Pr == NULL)         /* no subject process */
  97                 return (creat(filename, mode));
  98
  99         adp = &argd[0];         /* AT_FDCWD argument */
 100         adp->arg_value = AT_FDCWD;
 101         adp->arg_object = NULL;
 102         adp->arg_type = AT_BYVAL;
 103         adp->arg_inout = AI_INPUT;
 104         adp->arg_size = 0;
 105
 106         adp++;                  /* filename argument */
 107         adp->arg_value = 0;
 108         adp->arg_object = (void *)filename;
 109         adp->arg_type = AT_BYREF;
 110         adp->arg_inout = AI_INPUT;
 111         adp->arg_size = strlen(filename)+1;
 112
 113         adp++;                  /* flags argument */
 114         adp->arg_value = (O_WRONLY | O_CREAT | O_TRUNC);
 115         adp->arg_object = NULL;
 116         adp->arg_type = AT_BYVAL;
 117         adp->arg_inout = AI_INPUT;
 118         adp->arg_size = 0;
 119
 120         adp++;                  /* mode argument */
 121         adp->arg_value = (long)mode;
 122         adp->arg_object = NULL;
 123         adp->arg_type = AT_BYVAL;
 124         adp->arg_inout = AI_INPUT;
 125         adp->arg_size = 0;
 126
 127         error = Psyscall(Pr, &rval, SYS_openat, 4, &argd[0]);
 128
 129         if (error) {
 130                 errno = (error > 0)? error : ENOSYS;
 131                 return (-1);
 132         }
 133         return (rval.sys_rval1);
 134 }
 135
 136 /*
 137  * close() system call -- executed by subject process.
 138  */
 139 int
 140 pr_close(struct ps_prochandle *Pr, int fd)
 141 {
 142         sysret_t rval;                  /* return value from close() */
 143         argdes_t argd[1];               /* arg descriptors for close() */
 144         argdes_t *adp;
 145         int error;
 146
 147         if (Pr == NULL)         /* no subject process */
 148                 return (close(fd));
 149
 150         adp = &argd[0];         /* fd argument */
 151         adp->arg_value = (int)fd;
 152         adp->arg_object = NULL;
 153         adp->arg_type = AT_BYVAL;
 154         adp->arg_inout = AI_INPUT;
 155         adp->arg_size = 0;
 156
 157         error = Psyscall(Pr, &rval, SYS_close, 1, &argd[0]);
 158
 159         if (error) {
 160                 errno = (error > 0)? error : ENOSYS;
 161                 return (-1);
 162         }
 163         return (rval.sys_rval1);
 164 }
 165
 166 /*
 167  * access() system call -- executed by subject process.
 168  */
 169 int
 170 pr_access(struct ps_prochandle *Pr, const char *path, int amode)
 171 {
 172         sysret_t rval;                  /* return from access() */
 173         argdes_t argd[4];               /* arg descriptors for access() */
 174         argdes_t *adp;
 175         int err;
 176
 177         if (Pr == NULL)         /* no subject process */
 178                 return (access(path, amode));
 179
 180         adp = &argd[0];         /* directory fd argument */
 181         adp->arg_value = AT_FDCWD;
 182         adp->arg_object = NULL;
 183         adp->arg_type = AT_BYVAL;
 184         adp->arg_inout = AI_INPUT;
 185         adp->arg_size = 0;
 186
 187         adp++;                  /* path argument */
 188         adp->arg_value = 0;
 189         adp->arg_object = (void *)path;
 190         adp->arg_type = AT_BYREF;
 191         adp->arg_inout = AI_INPUT;
 192         adp->arg_size = strlen(path) + 1;
 193
 194         adp++;                  /* amode argument */
 195         adp->arg_value = (long)amode;
 196         adp->arg_object = NULL;
 197         adp->arg_type = AT_BYVAL;
 198         adp->arg_inout = AI_INPUT;
 199         adp->arg_size = 0;
 200
 201         adp++;                  /* flag argument */
 202         adp->arg_value = 0;
 203         adp->arg_object = NULL;
 204         adp->arg_type = AT_BYVAL;
 205         adp->arg_inout = AI_INPUT;
 206         adp->arg_size = 0;
 207
 208         err = Psyscall(Pr, &rval, SYS_faccessat, 4, &argd[0]);
 209
 210         if (err) {
 211                 errno = (err > 0) ? err : ENOSYS;
 212                 return (-1);
 213         }
 214
 215         return (rval.sys_rval1);
 216 }