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[/] [c0or1k/] [trunk/] [conts/] [posix/] [libposix/] [shm.c] - Rev 7
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/* * This is the glue logic between posix shared memory functions * and their L4 implementation. * * Copyright (C) 2007, 2008 Bahadir Balban */ #include <errno.h> #include <stdio.h> #include <sys/shm.h> #include <sys/types.h> #include <l4lib/ipcdefs.h> #include <l4/macros.h> #include <libposix.h> int l4_shmget(l4id_t key, int size, int shmflg) { int err; write_mr(L4SYS_ARG0, key); write_mr(L4SYS_ARG1, size); write_mr(L4SYS_ARG2, shmflg); /* Call pager with shmget() request. Check ipc error. */ if ((err = l4_sendrecv(pagerid, pagerid, L4_IPC_TAG_SHMGET)) < 0) { print_err("%s: L4 IPC Error: %d.\n", __FUNCTION__, err); return err; } /* Check if syscall itself was successful */ if (IS_ERR(err = l4_get_retval())) { print_err("%s: SHMGET Error: %d.\n", __FUNCTION__, err); return err; } /* Otherwise err has the positive id number */ return err; } void *l4_shmat(l4id_t shmid, const void *shmaddr, int shmflg) { int err; write_mr(L4SYS_ARG0, shmid); write_mr(L4SYS_ARG1, (unsigned long)shmaddr); write_mr(L4SYS_ARG2, shmflg); /* Call pager with shmget() request. Check ipc error. */ if ((err = l4_sendrecv(pagerid, pagerid, L4_IPC_TAG_SHMAT)) < 0) { print_err("%s: L4 IPC Error: %d.\n", __FUNCTION__, err); return PTR_ERR(err); } /* Check if syscall itself was successful */ if (IS_ERR(err = l4_get_retval())) { print_err("%s: SHMAT Error: %d.\n", __FUNCTION__, err); return PTR_ERR(err); } /* Obtain shm base. */ return (void *)err; } int l4_shmdt(const void *shmaddr) { int err; write_mr(L4SYS_ARG0, (unsigned long)shmaddr); /* Call pager with shmget() request. Check ipc error. */ if ((err = l4_sendrecv(pagerid, pagerid, L4_IPC_TAG_SHMDT)) < 0) { print_err("%s: L4 IPC Error: %d.\n", __FUNCTION__, err); return -1; } /* Check if syscall itself was successful */ if ((err = l4_get_retval()) < 0) { print_err("%s: SHMDT Error: %d.\n", __FUNCTION__, err); return -1; } return 0; } int shmget(key_t key, size_t size, int shmflg) { int ret = l4_shmget(key, size, shmflg); /* If error, return positive error code */ if (ret < 0) { errno = -ret; return -1; } /* else return value */ return ret; } void *shmat(int shmid, const void *shmaddr, int shmflg) { void *ret = l4_shmat(shmid, shmaddr, shmflg); /* If error, return positive error code */ if (IS_ERR(ret)) { errno = -((int)ret); return PTR_ERR(-1); } /* else return value */ return ret; } int shmdt(const void *shmaddr) { int ret = l4_shmdt(shmaddr); /* If error, return positive error code */ if (ret < 0) { errno = -ret; return -1; } /* else return value */ return ret; }
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