Back to index

glibc  2.9
Classes | Functions
shmctl.c File Reference
#include <errno.h>
#include <sys/shm.h>
#include <ipc_priv.h>
#include <sysdep.h>
#include <string.h>
#include <sys/syscall.h>
#include <bits/wordsize.h>
#include <bp-checks.h>
#include <kernel-features.h>
#include <shlib-compat.h>
This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Classes

struct  __old_shmid_ds
struct  __old_shminfo

Functions

int __new_shmctl (int, int, struct shmid_ds *)
 versioned_symbol (libc, __new_shmctl, shmctl, GLIBC_2_2)

Class Documentation

struct __old_shmid_ds

Definition at line 32 of file shmctl.c.

Class Members
struct vm_area_struct *__unbounded __attaches
unsigned short int __shm_npages
unsigned long int *__unbounded __shm_pages
__time_t shm_atime
__ipc_pid_t shm_cpid
__time_t shm_ctime
__time_t shm_dtime
__ipc_pid_t shm_lpid
unsigned short int shm_nattch
int shm_segsz
struct __old_shminfo

Definition at line 47 of file shmctl.c.

Class Members
int shmall
int shmmax
int shmmin
int shmmni
int shmseg

Function Documentation

int __new_shmctl ( int  shmid,
int  cmd,
struct shmid_ds buf 
)

Definition at line 60 of file shmctl.c.

{
#if __ASSUME_32BITUIDS > 0
  return INLINE_SYSCALL (shmctl, 3, shmid, cmd | __IPC_64, CHECK_1 (buf));
#else
  switch (cmd) {
    case SHM_STAT:
    case IPC_STAT:
    case IPC_SET:
    case IPC_INFO:
      break;
    default:
      return INLINE_SYSCALL (shmctl, 3, shmid, cmd, CHECK_1 (buf));
  }

  {
    int save_errno = errno, result;
    struct __old_shmid_ds old;

    /* Unfortunately there is no way how to find out for sure whether
       we should use old or new shmctl.  */
    result = INLINE_SYSCALL (shmctl, 3, shmid, cmd | __IPC_64, CHECK_1 (buf));
    if (result != -1 || errno != EINVAL)
      return result;

    __set_errno(save_errno);
    if (cmd == IPC_SET)
      {
       old.shm_perm.uid = buf->shm_perm.uid;
       old.shm_perm.gid = buf->shm_perm.gid;
       old.shm_perm.mode = buf->shm_perm.mode;
       if (old.shm_perm.uid != buf->shm_perm.uid ||
           old.shm_perm.gid != buf->shm_perm.gid)
         {
           __set_errno (EINVAL);
           return -1;
         }
      }
    result = INLINE_SYSCALL (shmctl, 3, shmid, cmd, __ptrvalue (&old));
    if (result != -1 && (cmd == SHM_STAT || cmd == IPC_STAT))
      {
       memset(buf, 0, sizeof(*buf));
       buf->shm_perm.__key = old.shm_perm.__key;
       buf->shm_perm.uid = old.shm_perm.uid;
       buf->shm_perm.gid = old.shm_perm.gid;
       buf->shm_perm.cuid = old.shm_perm.cuid;
       buf->shm_perm.cgid = old.shm_perm.cgid;
       buf->shm_perm.mode = old.shm_perm.mode;
       buf->shm_perm.__seq = old.shm_perm.__seq;
       buf->shm_atime = old.shm_atime;
       buf->shm_dtime = old.shm_dtime;
       buf->shm_ctime = old.shm_ctime;
       buf->shm_segsz = old.shm_segsz;
       buf->shm_nattch = old.shm_nattch;
       buf->shm_cpid = old.shm_cpid;
       buf->shm_lpid = old.shm_lpid;
      }
    else if (result != -1 && cmd == IPC_INFO)
      {
       struct __old_shminfo *oldi = (void *)&old;
       struct shminfo *i = (struct shminfo *)buf;

       memset(i, 0, sizeof(*i));
       i->shmmax = oldi->shmmax;
       i->shmmin = oldi->shmmin;
       i->shmmni = oldi->shmmni;
       i->shmseg = oldi->shmseg;
       i->shmall = oldi->shmall;
      }
    return result;
  }
#endif
}

Here is the call graph for this function:

versioned_symbol ( libc  ,
__new_shmctl  ,
shmctl  ,
GLIBC_2_2   
)