Changeset 2b88074b in mainline for uspace/lib/libc/include

Timestamp:

2009-10-29T22:06:46Z (16 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

2e983c7

Parents:

14ecd6c

Message:

vfs: file descriptors housekeeping changes

• add support for allocating new file descriptors from the end of the fd range (O_DESC)
• add support for assigning of an already opened file to a free file descriptor

vfs: VFS_OUT_CLOSE is called only when the file reference count is about to drop to zero
vfs: implement VFS_IN_DUP

libc: optimize current working directory housekeeping

• using opendir() was an overkill
• allocate current working directory file descriptor from the end of the fd range using O_DESC (so it doesn't mess with the well-known descriptors 0, 1 and 2)

libc: implement dup2() (via VFS_IN_DUP)

getvc: change stdin/stdout/stderr by a slightly more elegant way (using dup2())

Location:

uspace/lib/libc/include

Files:

• fcntl.h (modified) (1 diff)
• ipc/vfs.h (modified) (1 diff)
• unistd.h (modified) (1 diff)

uspace/lib/libc/include/fcntl.h

@@ -43 +43 @@
 #define O_RDWR    32
 #define O_WRONLY  64
+#define O_DESC    128
 
 extern int open(const char *, int, ...);

uspace/lib/libc/include/ipc/vfs.h

@@ -73 +73 @@
         VFS_IN_UNLINK,
         VFS_IN_RENAME,
-        VFS_IN_STAT
+        VFS_IN_STAT,
+        VFS_IN_DUP
 } vfs_in_request_t;
 

uspace/lib/libc/include/unistd.h

@@ -51 +51 @@
 #endif
 
+extern int dup2(int oldfd, int newfd);
+
 extern ssize_t write(int, const void *, size_t);
 extern ssize_t read(int, void *, size_t);