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/* Copyright (C) 1995-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sys/sem.h>
#include <stdarg.h>
#include <ipc_priv.h>
#include <sysdep.h>
#include <shlib-compat.h>
#include <errno.h>
/* Define a `union semun' suitable for Linux here. */
union semun
{
int val; /* value for SETVAL */
struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
unsigned short int *array; /* array for GETALL & SETALL */
struct seminfo *__buf; /* buffer for IPC_INFO */
};
#ifndef DEFAULT_VERSION
# ifndef __ASSUME_SYSVIPC_BROKEN_MODE_T
# define DEFAULT_VERSION GLIBC_2_2
# else
# define DEFAULT_VERSION GLIBC_2_31
# endif
#endif
static int
semctl_syscall (int semid, int semnum, int cmd, union semun arg)
{
#ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
return INLINE_SYSCALL_CALL (semctl, semid, semnum, cmd | __IPC_64,
arg.array);
#else
return INLINE_SYSCALL_CALL (ipc, IPCOP_semctl, semid, semnum, cmd | __IPC_64,
SEMCTL_ARG_ADDRESS (arg));
#endif
}
int
__new_semctl (int semid, int semnum, int cmd, ...)
{
/* POSIX states ipc_perm mode should have type of mode_t. */
_Static_assert (sizeof ((struct semid_ds){0}.sem_perm.mode)
== sizeof (mode_t),
"sizeof (msqid_ds.msg_perm.mode) != sizeof (mode_t)");
union semun arg = { 0 };
va_list ap;
/* Get the argument only if required. */
switch (cmd)
{
case SETVAL: /* arg.val */
case GETALL: /* arg.array */
case SETALL:
case IPC_STAT: /* arg.buf */
case IPC_SET:
case SEM_STAT:
case IPC_INFO: /* arg.__buf */
case SEM_INFO:
va_start (ap, cmd);
arg = va_arg (ap, union semun);
va_end (ap);
break;
}
#ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
struct semid_ds tmpds;
if (cmd == IPC_SET)
{
tmpds = *arg.buf;
tmpds.sem_perm.mode *= 0x10000U;
arg.buf = &tmpds;
}
#endif
int ret = semctl_syscall (semid, semnum, cmd, arg);
if (ret >= 0)
{
switch (cmd)
{
case IPC_STAT:
case SEM_STAT:
case SEM_STAT_ANY:
#ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
arg.buf->sem_perm.mode >>= 16;
#else
/* Old Linux kernel versions might not clear the mode padding. */
if (sizeof ((struct semid_ds){0}.sem_perm.mode)
!= sizeof (__kernel_mode_t))
arg.buf->sem_perm.mode &= 0xFFFF;
#endif
}
}
return ret;
}
versioned_symbol (libc, __new_semctl, semctl, DEFAULT_VERSION);
#if defined __ASSUME_SYSVIPC_BROKEN_MODE_T \
&& SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_31)
int
attribute_compat_text_section
__semctl_mode16 (int semid, int semnum, int cmd, ...)
{
union semun arg = { 0 };
va_list ap;
/* Get the argument only if required. */
switch (cmd)
{
case SETVAL: /* arg.val */
case GETALL: /* arg.array */
case SETALL:
case IPC_STAT: /* arg.buf */
case IPC_SET:
case SEM_STAT:
case IPC_INFO: /* arg.__buf */
case SEM_INFO:
va_start (ap, cmd);
arg = va_arg (ap, union semun);
va_end (ap);
break;
}
return semctl_syscall (semid, semnum, cmd, arg);
}
compat_symbol (libc, __semctl_mode16, semctl, GLIBC_2_2);
#endif
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
/* Since semctl use a variadic argument for semid_ds there is not need to
define and tie the compatibility symbol to the old 'union semun'
definition. */
int
attribute_compat_text_section
__old_semctl (int semid, int semnum, int cmd, ...)
{
union semun arg = { 0 };
va_list ap;
/* Get the argument only if required. */
switch (cmd)
{
case SETVAL: /* arg.val */
case GETALL: /* arg.array */
case SETALL:
case IPC_STAT: /* arg.buf */
case IPC_SET:
case SEM_STAT:
case IPC_INFO: /* arg.__buf */
case SEM_INFO:
va_start (ap, cmd);
arg = va_arg (ap, union semun);
va_end (ap);
break;
}
#if defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS \
&& !defined __ASSUME_SYSVIPC_DEFAULT_IPC_64
/* For architectures that have wire-up semctl but also have __IPC_64 to a
value different than default (0x0) it means the compat symbol used the
__NR_ipc syscall. */
return INLINE_SYSCALL_CALL (semctl, semid, semnum, cmd, arg.array);
# else
return INLINE_SYSCALL_CALL (ipc, IPCOP_semctl, semid, semnum, cmd,
SEMCTL_ARG_ADDRESS (arg));
# endif
}
compat_symbol (libc, __old_semctl, semctl, GLIBC_2_0);
#endif
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