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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [mq_unlink.c] - Rev 859
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/* Copyright 2002, Red Hat Inc. */ #include <mqueue.h> #include <errno.h> #include <fcntl.h> #include <sys/stat.h> #include <sys/mman.h> #include <sys/ipc.h> #include <sys/sem.h> #include <string.h> #include <stdlib.h> #include <machine/weakalias.h> #define _LIBC 1 #include <sys/lock.h> #undef _LIBC #include "mqlocal.h" int mq_unlink (const char *name) { int size; int saved_errno; char *real_name; char *ptr; int i, rc; int semid, msgqid; key_t key; /* ignore opening slash if present */ if (*name == '/') ++name; size = strlen(name); if ((real_name = (char *)malloc (size + sizeof(MSGQ_PREFIX))) == NULL) { errno = ENOSPC; return -1; } /* use given name to create shared memory file name - we convert any slashes to underscores so we don't have to create directories */ memcpy (real_name, MSGQ_PREFIX, sizeof(MSGQ_PREFIX) - 1); memcpy (real_name + sizeof(MSGQ_PREFIX) - 1, name, size + 1); ptr = real_name + sizeof(MSGQ_PREFIX) - 1; for (i = 0; i < size; ++i) { if (*ptr == '/') *ptr = '_'; ++ptr; } /* get key and then unlink shared memory file */ if ((key = ftok(real_name, 255)) == (key_t)-1) return -1; rc = unlink (real_name); if (rc == 0) { /* try to remove semaphore and msg queues associated with shared memory file */ saved_errno = errno; semid = semget (key, 6, 0); if (semid != -1) semctl (semid, 0, IPC_RMID); msgqid = msgget (key, 0); if (msgqid != -1) msgctl (msgqid, IPC_RMID, NULL); errno = saved_errno; } return rc; }
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