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[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [ipc/] [util.c] - Rev 1782
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/* * linux/ipc/util.c * Copyright (C) 1992 Krishna Balasubramanian */ #include <linux/config.h> #include <linux/errno.h> #include <asm/segment.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/sem.h> #include <linux/msg.h> #include <linux/shm.h> #include <linux/stat.h> #if defined(CONFIG_SYSVIPC) || defined(CONFIG_KERNELD) extern void sem_init (void), msg_init (void), shm_init (void); void ipc_init (void) { sem_init(); msg_init(); shm_init(); return; } /* * Check user, group, other permissions for access * to ipc resources. return 0 if allowed */ int ipcperms (struct ipc_perm *ipcp, short flag) { /* flag will most probably be 0 or S_...UGO from <linux/stat.h> */ int requested_mode, granted_mode; if (suser()) return 0; requested_mode = (flag >> 6) | (flag >> 3) | flag; granted_mode = ipcp->mode; if (current->euid == ipcp->cuid || current->euid == ipcp->uid) granted_mode >>= 6; else if (in_group_p(ipcp->cgid) || in_group_p(ipcp->gid)) granted_mode >>= 3; /* is there some bit set in requested_mode but not in granted_mode? */ if (requested_mode & ~granted_mode & 0007) return -1; return 0; } #else /* * Dummy functions when SYSV IPC isn't configured */ void sem_exit (void) { return; } int shm_swap (int prio, unsigned long limit) { return 0; } asmlinkage int sys_semget (key_t key, int nsems, int semflg) { return -ENOSYS; } asmlinkage int sys_semop (int semid, struct sembuf *sops, unsigned nsops) { return -ENOSYS; } asmlinkage int sys_semctl (int semid, int semnum, int cmd, union semun arg) { return -ENOSYS; } asmlinkage int sys_msgget (key_t key, int msgflg) { return -ENOSYS; } asmlinkage int sys_msgsnd (int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg) { return -ENOSYS; } asmlinkage int sys_msgrcv (int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp, int msgflg) { return -ENOSYS; } asmlinkage int sys_msgctl (int msqid, int cmd, struct msqid_ds *buf) { return -ENOSYS; } asmlinkage int sys_shmget (key_t key, int size, int flag) { return -ENOSYS; } asmlinkage int sys_shmat (int shmid, char *shmaddr, int shmflg, ulong *addr) { return -ENOSYS; } asmlinkage int sys_shmdt (char *shmaddr) { return -ENOSYS; } asmlinkage int sys_shmctl (int shmid, int cmd, struct shmid_ds *buf) { return -ENOSYS; } void kerneld_exit(void) { } #endif /* CONFIG_SYSVIPC */
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