lfs_segwait(2) [netbsd man page]

LFS_SEGWAIT(2)						      BSD System Calls Manual						    LFS_SEGWAIT(2)

NAME

     lfs_segwait -- wait until a segment is written

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/types.h>

     int
     lfs_segwait(fsid_t *fsidp, struct timeval *tv);

DESCRIPTION

     lfs_segwait() blocks until a new segment is acquired for writing by the filesystem specified by *fsidp or if *fsidp is -1, until a segment is
     acquired for writing by any LFS filesystem.

     If timeout is non-zero, lfs_segwait() will return after timeout milliseconds regardless of whether a new segment has been designated for
     writing or not.

RETURN VALUES

     lfs_segwait() returns 0 if a new segment was acquired; 1 if it timed out; or -1 on error.

ERRORS

     An error return from lfs_segwait() indicates:

     [EFAULT]		fsidp points outside the process's allocated address space.

     [EINTR]		A signal was delivered before the time limit expired and before a new segment was designated for writing.

     [EINVAL]		The specified time limit is negative.

SEE ALSO

     lfs_bmapv(2), lfs_markv(2), lfs_segclean(2), lfs_cleanerd(8)

HISTORY

     The lfs_segwait() function call appeared in 4.4BSD.

BSD
								   May 23, 2000 							       BSD

SHMAT(2)						      BSD System Calls Manual							  SHMAT(2)

NAME

     shmat, shmdt -- attach or detach shared memory

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/types.h>
     #include <sys/ipc.h>
     #include <sys/shm.h>

     void *
     shmat(int shmid, const void *addr, int flag);

     int
     shmdt(const void *addr);

DESCRIPTION

     The shmat() system call attaches the shared memory segment identified by shmid to the calling process's address space.  The address where the
     segment is attached is determined as follows:

     o	 If addr is 0, the segment is attached at an address selected by the kernel.

     o	 If addr is nonzero and SHM_RND is not specified in flag, the segment is attached the specified address.

     o	 If addr is specified and SHM_RND is specified, addr is rounded down to the nearest multiple of SHMLBA.

     The shmdt() system call detaches the shared memory segment at the address specified by addr from the calling process's address space.

RETURN VALUES

     Upon success, shmat() returns the address where the segment is attached; otherwise, -1 is returned and errno is set to indicate the error.

     The shmdt() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
     the error.

ERRORS

     The shmat() system call will fail if:

     [EINVAL]		No shared memory segment was found corresponding to shmid.

     [EINVAL]		The addr argument was not an acceptable address.

     The shmdt() system call will fail if:

     [EINVAL]		The addr argument does not point to a shared memory segment.

SEE ALSO

     shmctl(2), shmget(2)

BSD
								  August 2, 1995							       BSD