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glibc  2.9
Classes | Functions
semctl.c File Reference
#include <errno.h>
#include <stdarg.h>
#include <sys/sem.h>
#include <ipc_priv.h>
#include <sysdep.h>
#include <string.h>
#include <sys/syscall.h>
#include <kernel-features.h>
#include <bp-checks.h>
#include <bp-semctl.h>
#include <shlib-compat.h>
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Go to the source code of this file.

Classes

struct  __old_semid_ds
union  semun

Functions

int __new_semctl (int semid, int semnum, int cmd,...)
 versioned_symbol (libc, __new_semctl, semctl, GLIBC_2_2)

Class Documentation

struct __old_semid_ds

Definition at line 32 of file semctl.c.

Class Members
struct sem_queue * __sem_pending
struct sem_queue *__unbounded __sem_pending
struct sem_queue * __sem_pending_last
struct sem_queue *__unbounded __sem_pending_last
struct sem * __sembase
struct sem *__unbounded __sembase
struct sem_undo * __undo
struct sem_undo *__unbounded __undo
__time_t sem_ctime
unsigned short int sem_nsems
__time_t sem_otime
union semun

Definition at line 26 of file semctl.c.

Collaboration diagram for semun:
Class Members
struct seminfo * __buf
struct __old_semid_ds * __old_buf
unsigned short int * array
struct semid_ds * buf
int val

Function Documentation

int __new_semctl ( int  semid,
int  semnum,
int  cmd,
  ... 
)

Definition at line 61 of file semctl.c.

{
  union semun arg;
  va_list ap;

  va_start (ap, cmd);

  /* Get the argument.  */
  arg = va_arg (ap, union semun);

  va_end (ap);

#if __ASSUME_32BITUIDS > 0
  return INLINE_SYSCALL (semctl, 4, semid, semnum, cmd | __IPC_64,
                      CHECK_SEMCTL (&arg, semid, cmd | __IPC_64)->array);
#else
  switch (cmd) {
    case SEM_STAT:
    case IPC_STAT:
    case IPC_SET:
      break;
    default:
      return INLINE_SYSCALL (semctl, 4, semid, semnum, cmd,
                          CHECK_SEMCTL (&arg, semid, cmd)->array);
  }

  {
    int save_errno = errno, result;
    struct __old_semid_ds old;
    struct semid_ds *buf;

    /* Unfortunately there is no way how to find out for sure whether
       we should use old or new semctl.  */
    result = INLINE_SYSCALL (semctl, 4, semid, semnum, cmd | __IPC_64,
                          CHECK_SEMCTL (&arg, semid, cmd | __IPC_64)->array);
    if (result != -1 || errno != EINVAL)
      return result;

    __set_errno(save_errno);
    buf = arg.buf;
    arg.buf = (void *)&old;
    if (cmd == IPC_SET)
      {
       old.sem_perm.uid = buf->sem_perm.uid;
       old.sem_perm.gid = buf->sem_perm.gid;
       old.sem_perm.mode = buf->sem_perm.mode;
       if (old.sem_perm.uid != buf->sem_perm.uid ||
           old.sem_perm.gid != buf->sem_perm.gid)
         {
           __set_errno (EINVAL);
           return -1;
         }
      }
    result = INLINE_SYSCALL (semctl, 4, semid, semnum, cmd,
                          CHECK_SEMCTL (&arg, semid, cmd)->array);
    if (result != -1 && cmd != IPC_SET)
      {
       memset(buf, 0, sizeof(*buf));
       buf->sem_perm.__key = old.sem_perm.__key;
       buf->sem_perm.uid = old.sem_perm.uid;
       buf->sem_perm.gid = old.sem_perm.gid;
       buf->sem_perm.cuid = old.sem_perm.cuid;
       buf->sem_perm.cgid = old.sem_perm.cgid;
       buf->sem_perm.mode = old.sem_perm.mode;
       buf->sem_perm.__seq = old.sem_perm.__seq;
       buf->sem_otime = old.sem_otime;
       buf->sem_ctime = old.sem_ctime;
       buf->sem_nsems = old.sem_nsems;
      }
    return result;
  }
#endif
}

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versioned_symbol ( libc  ,
__new_semctl  ,
semctl  ,
GLIBC_2_2   
)