URL
https://opencores.org/ocsvn/openrisc_me/openrisc_me/trunk
Subversion Repositories openrisc_me
[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [mq_setattr.c] - Rev 298
Go to most recent revision | Compare with Previous | Blame | View Log
/* Copyright 2002, Red Hat Inc. */ #include <mqueue.h> #include <errno.h> #include <sys/sem.h> #include <string.h> #define _LIBC 1 #include <sys/lock.h> #undef _LIBC #include "mqlocal.h" int mq_setattr (mqd_t msgid, const struct mq_attr *mqstat, struct mq_attr *omqstat) { struct libc_mq *info; struct sembuf sb0 = {0, -1, 0}; int num_msgs; int rc = 0; info = __find_mq (msgid); if (info == NULL) { errno = EBADF; return -1; } /* temporarily lock message queue */ semop (info->semid, &sb0, 1); /* make copy of old structure */ if (omqstat != NULL) { num_msgs = semctl (info->semid, 3, GETVAL); if (num_msgs >= 0) { memcpy (omqstat, info->attr, sizeof(struct mq_attr)); omqstat->mq_curmsgs = num_msgs; } else rc = -1; } /* only the mq_flags field can be changed */ info->attr->mq_flags = mqstat->mq_flags; /* release message queue */ sb0.sem_op = 1; semop (info->semid, &sb0, 1); return rc; }
Go to most recent revision | Compare with Previous | Blame | View Log