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, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <errno.h>
  22 #include <stdarg.h>
  23 #include <sys/sem.h>
  24 #include <ipc_priv.h>
  25
  26 #include <sysdep.h>
  27 #include <string.h>
  28 #include <sys/syscall.h>
  29
  30 #include <kernel-features.h>
  31 #include <shlib-compat.h>
  32
  33 struct __old_semid_ds
  34 {
  35   struct __old_ipc_perm sem_perm;       /* operation permission struct */
  36   __time_t sem_otime;                   /* last semop() time */
  37   __time_t sem_ctime;                   /* last time changed by semctl() */
  38   struct sem *__sembase;                /* ptr to first semaphore in array */
  39   struct sem_queue *__sem_pending;      /* pending operations */
  40   struct sem_queue *__sem_pending_last; /* last pending operation */
  41   struct sem_undo *__undo;              /* ondo requests on this array */
  42   unsigned short int sem_nsems;         /* number of semaphores in set */
  43 };
  44
  45 /* Define a `union semun' suitable for Linux here.  */
  46 union semun
  47 {
  48   int val;                      /* value for SETVAL */
  49   struct semid_ds *buf;         /* buffer for IPC_STAT & IPC_SET */
  50   unsigned short int *array;    /* array for GETALL & SETALL */
  51   struct seminfo *__buf;        /* buffer for IPC_INFO */
  52   struct __old_semid_ds *__old_buf;
  53 };
  54
  55 #include <bp-checks.h>
  56 #include <bp-semctl.h>          /* definition of CHECK_SEMCTL needs union semum */
  57
  58 #ifdef __NR_getuid32
  59 # if __ASSUME_32BITUIDS == 0
  60 /* This variable is shared with all files that need to check for 32bit
  61    uids.  */
  62 extern int __libc_missing_32bit_uids;
  63 # endif
  64 #endif
  65
  66 /* Return identifier for array of NSEMS semaphores associated with
  67    KEY.  */
  68 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
  69 int __old_semctl (int semid, int semnum, int cmd, ...);
  70 #endif
  71 int __new_semctl (int semid, int semnum, int cmd, ...);
  72
  73 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
  74 int
  75 attribute_compat_text_section
  76 __old_semctl (int semid, int semnum, int cmd, ...)
  77 {
  78   union semun arg;
  79   va_list ap;
  80
  81   /* Get the argument only if required.  */
  82   arg.buf = NULL;
  83   switch (cmd)
  84     {
  85     case SETVAL:        /* arg.val */
  86     case GETALL:        /* arg.array */
  87     case SETALL:
  88     case IPC_STAT:      /* arg.buf */
  89     case IPC_SET:
  90     case SEM_STAT:
  91     case IPC_INFO:      /* arg.__buf */
  92     case SEM_INFO:
  93       va_start (ap, cmd);
  94       arg = va_arg (ap, union semun);
  95       va_end (ap);
  96       break;
  97     }
  98
  99   return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd,
 100                          CHECK_SEMCTL (&arg, semid, cmd));
 101 }
 102 compat_symbol (libc, __old_semctl, semctl, GLIBC_2_0);
 103 #endif
 104
 105 int
 106 __new_semctl (int semid, int semnum, int cmd, ...)
 107 {
 108   union semun arg;
 109   va_list ap;
 110
 111   /* Get the argument only if required.  */
 112   arg.buf = NULL;
 113   switch (cmd)
 114     {
 115     case SETVAL:        /* arg.val */
 116     case GETALL:        /* arg.array */
 117     case SETALL:
 118     case IPC_STAT:      /* arg.buf */
 119     case IPC_SET:
 120     case SEM_STAT:
 121     case IPC_INFO:      /* arg.__buf */
 122     case SEM_INFO:
 123       va_start (ap, cmd);
 124       arg = va_arg (ap, union semun);
 125       va_end (ap);
 126       break;
 127     }
 128
 129 #if __ASSUME_32BITUIDS > 0
 130   return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd | __IPC_64,
 131                          CHECK_SEMCTL (&arg, semid, cmd | __IPC_64));
 132 #else
 133   switch (cmd) {
 134     case SEM_STAT:
 135     case IPC_STAT:
 136     case IPC_SET:
 137       break;
 138     default:
 139       return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd,
 140                              CHECK_SEMCTL (&arg, semid, cmd));
 141   }
 142
 143   {
 144     int result;
 145     struct __old_semid_ds old;
 146     struct semid_ds *buf;
 147
 148 #ifdef __NR_getuid32
 149     if (__libc_missing_32bit_uids <= 0)
 150       {
 151         if (__libc_missing_32bit_uids < 0)
 152           {
 153             int save_errno = errno;
 154
 155             /* Test presence of new IPC by testing for getuid32 syscall.  */
 156             result = INLINE_SYSCALL (getuid32, 0);
 157             if (result == -1 && errno == ENOSYS)
 158               __libc_missing_32bit_uids = 1;
 159             else
 160               __libc_missing_32bit_uids = 0;
 161             __set_errno(save_errno);
 162           }
 163         if (__libc_missing_32bit_uids <= 0)
 164           {
 165             result = INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd | __IPC_64,
 166                                      CHECK_SEMCTL (&arg, semid, cmd | __IPC_64));
 167             return result;
 168           }
 169       }
 170 #endif
 171
 172     buf = arg.buf;
 173     arg.__old_buf = &old;
 174     if (cmd == IPC_SET)
 175       {
 176         old.sem_perm.uid = buf->sem_perm.uid;
 177         old.sem_perm.gid = buf->sem_perm.gid;
 178         old.sem_perm.mode = buf->sem_perm.mode;
 179         if (old.sem_perm.uid != buf->sem_perm.uid ||
 180             old.sem_perm.gid != buf->sem_perm.gid)
 181           {
 182             __set_errno (EINVAL);
 183             return -1;
 184           }
 185       }
 186     result = INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd,
 187                              CHECK_SEMCTL (&arg, semid, cmd));
 188     if (result != -1 && cmd != IPC_SET)
 189       {
 190         memset(buf, 0, sizeof(*buf));
 191         buf->sem_perm.__key = old.sem_perm.__key;
 192         buf->sem_perm.uid = old.sem_perm.uid;
 193         buf->sem_perm.gid = old.sem_perm.gid;
 194         buf->sem_perm.cuid = old.sem_perm.cuid;
 195         buf->sem_perm.cgid = old.sem_perm.cgid;
 196         buf->sem_perm.mode = old.sem_perm.mode;
 197         buf->sem_perm.__seq = old.sem_perm.__seq;
 198         buf->sem_otime = old.sem_otime;
 199         buf->sem_ctime = old.sem_ctime;
 200         buf->sem_nsems = old.sem_nsems;
 201       }
 202     return result;
 203   }
 204 #endif
 205 }
 206
 207 versioned_symbol (libc, __new_semctl, semctl, GLIBC_2_2);