shm.c 3.0 KB

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  1. /* Copyright (C) 1995, 1997, 1998 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Library General Public License as
  6. published by the Free Software Foundation; either version 2 of the
  7. License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Library General Public License for more details.
  12. You should have received a copy of the GNU Library General Public
  13. License along with the GNU C Library; see the file COPYING.LIB. If not,
  14. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  15. Boston, MA 02111-1307, USA. */
  16. /* SHMLBA uses it on most of the archs (not mips) */
  17. #define __getpagesize getpagesize
  18. #include <stdlib.h>
  19. #include <errno.h>
  20. #include <sys/shm.h>
  21. #include <syscall.h>
  22. #include "ipc.h"
  23. #ifdef L_shmat
  24. /* Attach the shared memory segment associated with SHMID to the data
  25. segment of the calling process. SHMADDR and SHMFLG determine how
  26. and where the segment is attached. */
  27. #if defined(__NR_osf_shmat)
  28. # define __NR_shmat __NR_osf_shmat
  29. #endif
  30. #ifdef __NR_shmat
  31. _syscall3(void *, shmat, int, shmid, const void *,shmaddr, int, shmflg);
  32. #else
  33. /* psm: don't remove this, else mips will fail */
  34. #include <unistd.h>
  35. libc_hidden_proto(getpagesize)
  36. void * shmat (int shmid, const void *shmaddr, int shmflg)
  37. {
  38. int retval;
  39. unsigned long raddr;
  40. retval = __syscall_ipc(IPCOP_shmat, shmid, shmflg, (int) &raddr, (void *) shmaddr, 0);
  41. return ((unsigned long int) retval > -(unsigned long int) SHMLBA
  42. ? (void *) retval : (void *) raddr);
  43. }
  44. #endif
  45. #endif
  46. #ifdef L_shmctl
  47. /* Provide operations to control over shared memory segments. */
  48. #ifdef __NR_shmctl
  49. #define __NR___libc_shmctl __NR_shmctl
  50. static inline _syscall3(int, __libc_shmctl, int, shmid, int, cmd, struct shmid_ds *, buf);
  51. #endif
  52. int shmctl(int shmid, int cmd, struct shmid_ds *buf)
  53. {
  54. #ifdef __NR_shmctl
  55. return __libc_shmctl(shmid, cmd | __IPC_64, buf);
  56. #else
  57. return __syscall_ipc(IPCOP_shmctl, shmid, cmd | __IPC_64, 0, buf, 0);
  58. #endif
  59. }
  60. #endif
  61. #ifdef L_shmdt
  62. /* Detach shared memory segment starting at address specified by SHMADDR
  63. from the caller's data segment. */
  64. #ifdef __NR_shmdt
  65. _syscall1(int, shmdt, const void *, shmaddr);
  66. #else
  67. int shmdt (const void *shmaddr)
  68. {
  69. return __syscall_ipc(IPCOP_shmdt, 0, 0, 0, (void *) shmaddr, 0);
  70. }
  71. #endif
  72. #endif
  73. #ifdef L_shmget
  74. /* Return an identifier for an shared memory segment of at least size SIZE
  75. which is associated with KEY. */
  76. #ifdef __NR_shmget
  77. _syscall3(int, shmget, key_t, key, size_t, size, int, shmflg);
  78. #else
  79. int shmget (key_t key, size_t size, int shmflg)
  80. {
  81. return __syscall_ipc(IPCOP_shmget, key, size, shmflg, NULL, 0);
  82. }
  83. #endif
  84. #endif