sysdeps/unix/sysv/linux/sparc/sparc32/semctl.c

   1 /* Semctl for architectures where word sized unions are passed indirectly
   2    Copyright (C) 1995,1997,1998,2000,2002,2003,2004,2006
   3         Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #include <errno.h>
  23 #include <stdarg.h>
  24 #include <sys/sem.h>
  25 #include <ipc_priv.h>
  26
  27 #include <sysdep.h>
  28 #include <string.h>
  29 #include <sys/syscall.h>
  30
  31 #include <kernel-features.h>
  32 #include <shlib-compat.h>
  33
  34 struct __old_semid_ds
  35 {
  36   struct __old_ipc_perm sem_perm;       /* operation permission struct */
  37   __time_t sem_otime;                   /* last semop() time */
  38   __time_t sem_ctime;                   /* last time changed by semctl() */
  39   struct sem *__sembase;                /* ptr to first semaphore in array */
  40   struct sem_queue *__sem_pending;      /* pending operations */
  41   struct sem_queue *__sem_pending_last; /* last pending operation */
  42   struct sem_undo *__undo;              /* ondo requests on this array */
  43   unsigned short int sem_nsems;         /* number of semaphores in set */
  44 };
  45
  46 /* Define a `union semun' suitable for Linux here.  */
  47 union semun
  48 {
  49   int val;                      /* value for SETVAL */
  50   struct semid_ds *buf;         /* buffer for IPC_STAT & IPC_SET */
  51   unsigned short int *array;    /* array for GETALL & SETALL */
  52   struct seminfo *__buf;        /* buffer for IPC_INFO */
  53   struct __old_semid_ds *__old_buf;
  54 };
  55
  56 #include <bp-checks.h>
  57 #include <bp-semctl.h>          /* definition of CHECK_SEMCTL needs union semum */
  58
  59 #ifdef __NR_getuid32
  60 # if __ASSUME_32BITUIDS == 0
  61 /* This variable is shared with all files that need to check for 32bit
  62    uids.  */
  63 extern int __libc_missing_32bit_uids;
  64 # endif
  65 #endif
  66
  67 /* Return identifier for array of NSEMS semaphores associated with
  68    KEY.  */
  69 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
  70 int __old_semctl (int semid, int semnum, int cmd, ...);
  71 #endif
  72 int __new_semctl (int semid, int semnum, int cmd, ...);
  73
  74 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
  75 int
  76 attribute_compat_text_section
  77 __old_semctl (int semid, int semnum, int cmd, ...)
  78 {
  79   union semun arg;
  80   va_list ap;
  81
  82   /* Get the argument only if required.  */
  83   arg.buf = NULL;
  84   switch (cmd)
  85     {
  86     case SETVAL:        /* arg.val */
  87     case GETALL:        /* arg.array */
  88     case SETALL:
  89     case IPC_STAT:      /* arg.buf */
  90     case IPC_SET:
  91     case SEM_STAT:
  92     case IPC_INFO:      /* arg.__buf */
  93     case SEM_INFO:
  94       va_start (ap, cmd);
  95       arg = va_arg (ap, union semun);
  96       va_end (ap);
  97       break;
  98     }
  99
 100   return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd,
 101                          CHECK_SEMCTL (&arg, semid, cmd));
 102 }
 103 compat_symbol (libc, __old_semctl, semctl, GLIBC_2_0);
 104 #endif
 105
 106 int
 107 __new_semctl (int semid, int semnum, int cmd, ...)
 108 {
 109   union semun arg;
 110   va_list ap;
 111
 112   /* Get the argument only if required.  */
 113   arg.buf = NULL;
 114   switch (cmd)
 115     {
 116     case SETVAL:        /* arg.val */
 117     case GETALL:        /* arg.array */
 118     case SETALL:
 119     case IPC_STAT:      /* arg.buf */
 120     case IPC_SET:
 121     case SEM_STAT:
 122     case IPC_INFO:      /* arg.__buf */
 123     case SEM_INFO:
 124       va_start (ap, cmd);
 125       arg = va_arg (ap, union semun);
 126       va_end (ap);
 127       break;
 128     }
 129
 130 #if __ASSUME_32BITUIDS > 0
 131   return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd | __IPC_64,
 132                          CHECK_SEMCTL (&arg, semid, cmd | __IPC_64));
 133 #else
 134   switch (cmd) {
 135     case SEM_STAT:
 136     case IPC_STAT:
 137     case IPC_SET:
 138       break;
 139     default:
 140       return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd,
 141                              CHECK_SEMCTL (&arg, semid, cmd));
 142   }
 143
 144   {
 145     int result;
 146     struct __old_semid_ds old;
 147     struct semid_ds *buf;
 148
 149 #ifdef __NR_getuid32
 150     if (__libc_missing_32bit_uids <= 0)
 151       {
 152         if (__libc_missing_32bit_uids < 0)
 153           {
 154             int save_errno = errno;
 155
 156             /* Test presence of new IPC by testing for getuid32 syscall.  */
 157             result = INLINE_SYSCALL (getuid32, 0);
 158             if (result == -1 && errno == ENOSYS)
 159               __libc_missing_32bit_uids = 1;
 160             else
 161               __libc_missing_32bit_uids = 0;
 162             __set_errno(save_errno);
 163           }
 164         if (__libc_missing_32bit_uids <= 0)
 165           {
 166             result = INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd | __IPC_64,
 167                                      CHECK_SEMCTL (&arg, semid, cmd | __IPC_64));
 168             return result;
 169           }
 170       }
 171 #endif
 172
 173     buf = arg.buf;
 174     arg.__old_buf = &old;
 175     if (cmd == IPC_SET)
 176       {
 177         old.sem_perm.uid = buf->sem_perm.uid;
 178         old.sem_perm.gid = buf->sem_perm.gid;
 179         old.sem_perm.mode = buf->sem_perm.mode;
 180         if (old.sem_perm.uid != buf->sem_perm.uid ||
 181             old.sem_perm.gid != buf->sem_perm.gid)
 182           {
 183             __set_errno (EINVAL);
 184             return -1;
 185           }
 186       }
 187     result = INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd,
 188                              CHECK_SEMCTL (&arg, semid, cmd));
 189     if (result != -1 && cmd != IPC_SET)
 190       {
 191         memset(buf, 0, sizeof(*buf));
 192         buf->sem_perm.__key = old.sem_perm.__key;
 193         buf->sem_perm.uid = old.sem_perm.uid;
 194         buf->sem_perm.gid = old.sem_perm.gid;
 195         buf->sem_perm.cuid = old.sem_perm.cuid;
 196         buf->sem_perm.cgid = old.sem_perm.cgid;
 197         buf->sem_perm.mode = old.sem_perm.mode;
 198         buf->sem_perm.__seq = old.sem_perm.__seq;
 199         buf->sem_otime = old.sem_otime;
 200         buf->sem_ctime = old.sem_ctime;
 201         buf->sem_nsems = old.sem_nsems;
 202       }
 203     return result;
 204   }
 205 #endif
 206 }
 207
 208 versioned_symbol (libc, __new_semctl, semctl, GLIBC_2_2);