/*
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/*
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* linux/ipc/util.c
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* linux/ipc/util.c
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* Copyright (C) 1992 Krishna Balasubramanian
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* Copyright (C) 1992 Krishna Balasubramanian
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*/
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*/
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#include <linux/config.h>
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#include <linux/config.h>
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <asm/segment.h>
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#include <asm/segment.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/sem.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/stat.h>
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#if defined(CONFIG_SYSVIPC) || defined(CONFIG_KERNELD)
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#if defined(CONFIG_SYSVIPC) || defined(CONFIG_KERNELD)
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extern void sem_init (void), msg_init (void), shm_init (void);
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extern void sem_init (void), msg_init (void), shm_init (void);
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void ipc_init (void)
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void ipc_init (void)
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{
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{
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sem_init();
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sem_init();
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msg_init();
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msg_init();
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shm_init();
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shm_init();
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return;
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return;
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}
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}
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/*
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/*
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* Check user, group, other permissions for access
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* Check user, group, other permissions for access
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* to ipc resources. return 0 if allowed
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* to ipc resources. return 0 if allowed
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*/
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*/
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int ipcperms (struct ipc_perm *ipcp, short flag)
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int ipcperms (struct ipc_perm *ipcp, short flag)
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{ /* flag will most probably be 0 or S_...UGO from <linux/stat.h> */
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{ /* flag will most probably be 0 or S_...UGO from <linux/stat.h> */
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int requested_mode, granted_mode;
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int requested_mode, granted_mode;
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if (suser())
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if (suser())
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return 0;
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return 0;
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requested_mode = (flag >> 6) | (flag >> 3) | flag;
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requested_mode = (flag >> 6) | (flag >> 3) | flag;
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granted_mode = ipcp->mode;
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granted_mode = ipcp->mode;
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if (current->euid == ipcp->cuid || current->euid == ipcp->uid)
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if (current->euid == ipcp->cuid || current->euid == ipcp->uid)
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granted_mode >>= 6;
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granted_mode >>= 6;
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else if (in_group_p(ipcp->cgid) || in_group_p(ipcp->gid))
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else if (in_group_p(ipcp->cgid) || in_group_p(ipcp->gid))
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granted_mode >>= 3;
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granted_mode >>= 3;
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/* is there some bit set in requested_mode but not in granted_mode? */
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/* is there some bit set in requested_mode but not in granted_mode? */
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if (requested_mode & ~granted_mode & 0007)
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if (requested_mode & ~granted_mode & 0007)
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return -1;
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return -1;
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return 0;
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return 0;
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}
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}
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#else
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#else
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/*
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/*
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* Dummy functions when SYSV IPC isn't configured
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* Dummy functions when SYSV IPC isn't configured
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*/
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*/
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void sem_exit (void)
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void sem_exit (void)
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{
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{
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return;
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return;
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}
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}
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int shm_swap (int prio, unsigned long limit)
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int shm_swap (int prio, unsigned long limit)
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{
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{
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return 0;
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return 0;
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}
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}
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asmlinkage int sys_semget (key_t key, int nsems, int semflg)
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asmlinkage int sys_semget (key_t key, int nsems, int semflg)
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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asmlinkage int sys_semop (int semid, struct sembuf *sops, unsigned nsops)
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asmlinkage int sys_semop (int semid, struct sembuf *sops, unsigned nsops)
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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asmlinkage int sys_semctl (int semid, int semnum, int cmd, union semun arg)
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asmlinkage int sys_semctl (int semid, int semnum, int cmd, union semun arg)
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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asmlinkage int sys_msgget (key_t key, int msgflg)
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asmlinkage int sys_msgget (key_t key, int msgflg)
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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asmlinkage int sys_msgsnd (int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg)
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asmlinkage int sys_msgsnd (int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg)
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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asmlinkage int sys_msgrcv (int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp,
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asmlinkage int sys_msgrcv (int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp,
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int msgflg)
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int msgflg)
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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asmlinkage int sys_msgctl (int msqid, int cmd, struct msqid_ds *buf)
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asmlinkage int sys_msgctl (int msqid, int cmd, struct msqid_ds *buf)
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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asmlinkage int sys_shmget (key_t key, int size, int flag)
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asmlinkage int sys_shmget (key_t key, int size, int flag)
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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asmlinkage int sys_shmat (int shmid, char *shmaddr, int shmflg, ulong *addr)
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asmlinkage int sys_shmat (int shmid, char *shmaddr, int shmflg, ulong *addr)
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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asmlinkage int sys_shmdt (char *shmaddr)
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asmlinkage int sys_shmdt (char *shmaddr)
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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asmlinkage int sys_shmctl (int shmid, int cmd, struct shmid_ds *buf)
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asmlinkage int sys_shmctl (int shmid, int cmd, struct shmid_ds *buf)
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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void kerneld_exit(void)
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void kerneld_exit(void)
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{
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{
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}
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}
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#endif /* CONFIG_SYSVIPC */
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#endif /* CONFIG_SYSVIPC */
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