Provided by: libdpm-dev_1.13.0-1_amd64
rfio_open - opens a file
#include <sys/types.h> #include "rfio_api.h" int rfio_open (const char *path, int flags, int mode); Under Linux, for large files: #define _LARGEFILE64_SOURCE #include <sys/types.h> #include "rfio_api.h" int rfio_open64 (const char *path, int flags, int mode); For large files, under other systems: #include <sys/types.h> #include "rfio_api.h" int rfio_open64 (const char *path, int flags, int mode);
rfio_open opens the file whose name is the string pointed to by path, a character string containing the filename specification, and associates a FILE stream with it. flags are formed by ORing the following values: O_RDONLY Open for reading only O_WRONLY Open for writing only O_RDWR Open for reading and writing O_NDELAY Do not block on open O_APPEND Append on each write O_CREAT Create file if it does not exist O_TRUNC Truncate size to 0 O_EXCL Error if create and file exists O_LARGEFILE When size can be superior to 2GB-1. See NOTES mode specifies the permission bits to be set if the file is created. Opening a file with O_APPEND set causes each write on the file to be appended to the end. If O_TRUNC is specified and the file exists, the file is truncated to zero length. If O_EXCL is set with O_CREAT, then if the file already exists, the open returns an error. This can be used to implement a simple exclusive access locking mechanism. If O_EXCL is set and the last component of the pathname is a symbolic link, the open will succeed even if the symbolic link points to an existing name. If the O_NDELAY flag is specified and the open call would result in the process being blocked for some reason (for example waiting for a carrier on a dial-up line), the open returns immediately. The first time the process attempts to perform IO on the open file, it will block (not currently implemented). On systems that support the Large Files, O_LARGEFILE in rfio_open allows files whose sizes cannot be represented in 31 bits to be opened.
If successful, returns a non-negative integer which may be used to refer to the file on subsequent rfio_write, rfio_read and rfio_close calls. On failure, rfio_open returns -1 and the error code is stored in serrno.
ENOENT The named file/directory does not exist or is a null pathname. EACCES Search permission is denied on a component of the path prefix. EBUSY Device or resource busy. Happens if you try to open in write mode a LCG file that is in an active migration stream. EFAULT path is a NULL pointer. ENOTDIR A component of path prefix is not a directory. ENAMETOOLONG The length of path exceeds CA_MAXPATHLEN or the length of a path component exceeds CA_MAXNAMELEN. SENOSHOST Host unknown. SENOSSERV Service unknown. SECOMERR Communication error.
On Irix, Tru64 and IA64 the 64 bit mode is the default one, open and open64 are identical. The flag O_LARGEFILE is accepted on Irix and IA64 (where it has no effect) but not on Tru64. On all other platforms, rfio_open with O_LARGEFILE is equivalent to a call to rfio_open64.
LCG Grid Deployment Team