ipc消息队列系统函数调用源码入口：如sys_msgsnd

路径：linux/ipc/syscall.c

/*
   2 * sys_ipc() is the old de-multiplexer for the SysV IPC calls.
   3 *
   4 * This is really horribly ugly, and new architectures should just wire up
   5 * the individual syscalls instead.
   6 */
   7#include <linux/unistd.h>
   8
   9#ifdef __ARCH_WANT_SYS_IPC
  10#include <linux/errno.h>
  11#include <linux/ipc.h>
  12#include <linux/shm.h>
  13#include <linux/syscalls.h>
  14#include <linux/uaccess.h>
  15
  16SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
  17                unsigned long, third, void __user *, ptr, long, fifth)
  18{
  19        int version, ret;
  20
  21        version = call >> 16; /* hack for backward compatibility */
  22        call &= 0xffff;
  23
  24        switch (call) {
  25        case SEMOP:
  26                return sys_semtimedop(first, (struct sembuf __user *)ptr,
  27                                      second, NULL);
  28        case SEMTIMEDOP:
  29                return sys_semtimedop(first, (struct sembuf __user *)ptr,
  30                                      second,
  31                                      (const struct timespec __user *)fifth);
  32
  33        case SEMGET:
  34                return sys_semget(first, second, third);
  35        case SEMCTL: {
  36                union semun fourth;
  37                if (!ptr)
  38                        return -EINVAL;
  39                if (get_user(fourth.__pad, (void __user * __user *) ptr))
  40                        return -EFAULT;
  41                return sys_semctl(first, second, third, fourth);
  42        }
  43
  44        case MSGSND:
  45                return sys_msgsnd(first, (struct msgbuf __user *) ptr,
  46                                  second, third);
  47        case MSGRCV:
  48                switch (version) {
  49                case 0: {
  50                        struct ipc_kludge tmp;
  51                        if (!ptr)
  52                                return -EINVAL;
  53
  54                        if (copy_from_user(&tmp,
  55                                           (struct ipc_kludge __user *) ptr,
  56                                           sizeof(tmp)))
  57                                return -EFAULT;
  58                        return sys_msgrcv(first, tmp.msgp, second,
  59                                           tmp.msgtyp, third);
  60                }
  61                default:
  62                        return sys_msgrcv(first,
  63                                           (struct msgbuf __user *) ptr,
  64                                           second, fifth, third);
  65                }
  66        case MSGGET:
  67                return sys_msgget((key_t) first, second);
  68        case MSGCTL:
  69                return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
  70
  71        case SHMAT:
  72                switch (version) {
  73                default: {
  74                        unsigned long raddr;
  75                        ret = do_shmat(first, (char __user *)ptr,
  76                                       second, &raddr);
  77                        if (ret)
  78                                return ret;
  79                        return put_user(raddr, (unsigned long __user *) third);
  80                }
  81                case 1:
  82                        /*
  83                         * This was the entry point for kernel-originating calls
  84                         * from iBCS2 in 2.2 days.
  85                         */
  86                        return -EINVAL;
  87                }
  88        case SHMDT:
  89                return sys_shmdt((char __user *)ptr);
  90        case SHMGET:
  91                return sys_shmget(first, second, third);
  92        case SHMCTL:
  93                return sys_shmctl(first, second,
  94                                   (struct shmid_ds __user *) ptr);
  95        default:
  96                return -ENOSYS;
  97        }
  98}
  99#endif
 100

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