Many of the application program interfaces (APIs) that perform operations on integrated file system objects are in the form of C language functions.
You have a choice of two sets of functions, either of which you can use in programs that are created using Integrated Language Environment® (ILE) C/400®:
- Integrated file system C functions that are included in i5/OS™.
- C functions provided by the ILE C/400 licensed program.
For information about the exit programs that the integrated file system supports, see Table 2.
The integrated file system functions operate only through the integrated file system stream I/O support. The following APIs are supported:
| Function | Description |
|---|---|
| access() | Determine file accessibility |
| accessx() | Determine file accessibility for a class of users |
| chdir() | Change current directory |
| chmod() | Change file authorizations |
| chown() | Change owner and group of file |
| close() | Close file descriptor |
| closedir() | Close directory |
| creat() | Create new file or rewrite existing file |
| creat64() | Create new file or rewrite existing file (large file enabled) |
| DosSetFileLocks() | Lock and unlock byte range of a file |
| DosSetFileLocks64() | Lock and unlock byte range of a file (large file enabled) |
| DosSetRelMaxFH() | Change the maximum number of file descriptors |
| dup() | Duplicate open file descriptor |
| dup2() | Duplicate open file descriptor to another descriptor |
| faccessx() | Determine file accessibility for a class of users by descriptor |
| fchdir() | Change current directory by descriptor |
| fchmod() | Change file authorizations by descriptor |
| fchown() | Change owner and group of file by descriptor |
| fclear() | Clear a file |
| fclear64() | Clear a file (large file enabled) |
| fcntl() | Perform file control action |
| fpathconf() | Get configurable path name variables by descriptor |
| fstat() | Get file information by descriptor |
| fstat64() | Get file information by descriptor (large file enabled) |
| fstatvfs() | Get information by descriptor |
| fstatvfs64() | Get information by descriptor (64-bit enabled) |
| fsync() | Synchronize changes to file |
| ftruncate() | Truncate file |
| ftruncate64() | Truncate file (large file enabled) |
| getcwd() | Get path name of current directory |
| getegid() | Get effective group ID |
| geteuid() | Get effective user ID |
| getgid() | Get real group ID |
| getgrgid() | Get group information using group ID |
| getgrnam() | Get group information using group name |
| getgroups() | Get group IDs |
| getpwnam() | Get user information for user name |
| getpwuid() | Get user information for user ID |
| getuid() | Get real user ID |
| givedescriptor() | Give file access to another job |
| ioctl() | Perform file I/O control action |
| link() | Create link to file |
| lseek() | Set file read/write offset |
| lseek64() | Set file read/write offset (large file enabled) |
| lstat() | Get file or link information |
| lstat64() | Get file or link information (large file enabled) |
| mmap() | Create a memory map |
| mmap64() | Create a memory map (large file enabled) |
| mprotect() | Change a memory map protection |
| msync() | Synchronize a memory map |
| munmap() | Remove a memory map |
| mkdir() | Make directory |
| mkfifo() | Make FIFO special file |
| open() | Open file |
| open64() | Open file (large file enabled) |
| opendir() | Open directory |
| pathconf() | Get configurable path name variables |
| pipe() | Create interprocess channel with sockets |
| pread() | Read from descriptor with offset |
| pread64() | Read from descriptor with offset (large file enabled) |
| pwrite() | Write to descriptor with offset |
| pwrite64() | Write to descriptor with offset (large file enabled) |
| QjoEndJournal() | End journaling |
 QjoRetrieveJournalEntries() |
Retrieve Journal
Entries |
| QjoRetrieveJournal Information() | Retrieve journal information |
| QJORJIDI() | Retrieve journal identifier information |
| QJOSJRNE() | Send journal entry |
| QjoStartJournal() | Start journaling |
| QlgAccess() | Determine file accessibility (using NLS-enabled path name) |
| QlgAccessx() | Determine file accessibility for a class of users (using NLS-enabled path name) |
| QlgChdir() | Change current directory (using NLS-enabled path name) |
| QlgChmod() | Change file authorizations (using NLS-enabled path name) |
| QlgChown() | Change owner and group of file (using NLS-enabled path name) |
| QlgCreat() | Create new file or rewrite existing file (using NLS-enabled path name) |
| QlgCreat64() | Create new file or rewrite existing file (large file enabled and using NLS-enabled path name) |
| QlgCvtPathToQSYSObjName() | Resolve Integrated File System path name into QSYS Object Name (using NLS-enabled path name) |
| QlgGetAttr() | Get system attributes for an object (using NLS-enabled path name) |
| QlgGetcwd() | Get path name of current directory (using NLS-enabled path name) |
| QlgGetPathFromFileID() | Get path name of object from its file ID (using NLS-enabled path name) |
| QlgGetpwnam() | Get user information for user name (using NLS-enabled path name) |
| QlgGetpwnam_r() | Get user information for user name (using NLS-enabled path name) |
| QlgGetpwuid() | Get user information for user ID (using NLS-enabled path name) |
| QlgGetpwuid_r() | Get user information for user ID (using NLS-enabled path name) |
| QlgLchown() | Change owner and group of symbolic link (using NLS-enabled path name) |
| QlgLink() | Create link to file (using NLS-enabled path name) |
| QlgLstat() | Get file or link information (using NLS-enabled path name) |
| QlgLstat64() | Get file or link information (large file enabled and using NLS-enabled path name) |
| QlgMkdir() | Make directory (using NLS-enabled path name) |
| QlgMkfifo() | Make FIFO special file (using NLS-enabled path name) |
| QlgOpen() | Open file (using NLS-enabled path name) |
| QlgOpen64() | Open file (large file enabled and using NLS-enabled path name) |
| QlgOpendir() | Open directory (using NLS-enabled path name) |
| QlgPathconf() | Get configurable path name variables (using NLS-enabled path name) |
| QlgProcessSubtree() | Process directories or objects within a directory tree (using NLS-enabled path name) |
| QlgReaddir() | Read directory entry (using NLS-enabled path name) |
| QlgReaddir_r() | Read directory entry (threadsafe and using NLS-enabled path name) |
| QlgReadlink() | Read value of symbolic link (using NLS-enabled path name) |
| QlgRenameKeep() | Rename file or directory, keep new if it exists (using NLS-enabled path name) |
| QlgRenameUnlink() | Rename file or directory, unlink new if it exists (using NLS-enabled path name) |
| QlgRmdir() | Remove directory (using NLS-enabled path name) |
| QlgSaveStgFree() | Save objects data and free its storage (using NLS-enabled path name) |
| QlgSetAttr() | Set system attributes for an object (using NLS-enabled path name) |
| QlgStat() | Get file information (using NLS-enabled path name) |
| QlgStat64() | Get file information (large file enabled and using NLS-enabled path name) |
| QlgStatvfs() | Get file system information (using NLS-enabled path name) |
| QlgStatvfs64() | Get file system information (large file enabled and using NLS-enabled path name) |
| QlgSymlink() | Make symbolic link (using NLS-enabled path name) |
| QlgUnlink() | Unlink file (using NLS-enabled path name) |
| QlgUtime() | Set file access and modification times (using NLS-enabled path name) |
| QP0FPTOS() | Perform miscellaneous file system functions |
| QP0LCHSG() | Change scan signature |
| Qp0lCvtPathToSYSObjName() | Resolve integrated file system path name into QSYS Object Name |
| QP0LFLOP() | Perform miscellaneous operations on objects |
| Qp0lGetAttr() | Get system attributes for an object |
| Qp0lGetPathFromFileID() | Get path name of object from its file ID |
| Qp0lOpen() | Open file with NLS-enabled path name |
| Qp0lProcessSubtree() | Process directories or objects within a directory tree |
| Qp0lRenameKeep() | Rename file or directory, keep new if it exists |
| Qp0lRenameUnlink() | Rename file or directory, unlink new if it exists |
| QP0LROR() | Retrieve object references |
| QP0LRRO() | Retrieve referenced objects |
| QP0LRTSG() | Retrieve scan signature |
| Qp0lSaveStgFree() | Save objects data and free its storage |
| Qp0lSetAttr() | Set system attributes for an object |
| Qp0lUnlink() | Unlink file with NLS-enabled path name |
| qsysetegid() | Set effective group ID |
| qsyseteuid() | Set effective user ID |
| qsysetgid() | Set group ID |
| qsysetregid() | Set real and effective group IDs |
| qsysetreuid() | Set real and effective user IDs |
| qsysetuid() | Set user ID |
| QZNFRTVE() | Retrieve NFS export information |
| read() | Read from file |
| readdir() | Read directory entry |
| readdir_r() | Read directory entry (threadsafe) |
| readlink() | Read value of symbolic link |
| readv() | Read from file (vector) |
| rename() | Rename file or directory. Can be defined to have the semantics of Qp0lRenameKeep() or Qp0lRenameUnlink(). |
| rewinddir() | Reset directory stream |
| rmdir() | Remove directory |
| select() | Check I/O status of multiple file descriptors |
| stat() | Get file information |
| stat64() | Get file information (large file enabled) |
| statvfs() | Get file system information |
| statvfs64() | Get file system information (large file enabled) |
| symlink() | Make symbolic link |
| sysconf() | Get system configuration variables |
| takedescriptor() | Take file access from another job |
| umask() | Set authorization mask for job |
| unlink() | Remove link to file |
| utime() | Set file access and modification times |
| write() | Write to file |
| writev() | Write to file (vector) |
| Function | Description |
|---|---|
| Integrated File System Scan on Close API | Called during close processing such as with the close() API. This exit program must be provided by the user. |
| Integrated File System Scan on Open API | Called during open processing such as with the open() API. This exit program must be provided by the user. |
| Process a Path Name | Called by the Qp0lProcessSubtree() API for each object in the API's search that meets the caller's selection criteria. This exit program must be provided by the user. |
| Save Storage Free | Called by the Qp0lSaveStgFree() API to save a *STMF iSeries™ object type. This exit program must be provided by the user. |