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Kernel, libc: Add O_APPEND and stub out O_CREAT and O_TRUNC

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apio 2022-10-27 07:43:55 +02:00
parent 651ffe6d64
commit a3c6635f3e
2 changed files with 28 additions and 0 deletions
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22
kernel/src/sys/stdio.cpp
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@ -17,6 +17,9 @@
#define OPEN_NONBLOCK 4 #define OPEN_NONBLOCK 4
#define OPEN_CLOEXEC 8 #define OPEN_CLOEXEC 8
#define OPEN_DIRECTORY 16 #define OPEN_DIRECTORY 16
#define OPEN_TRUNCATED 32
#define OPEN_CREATE 64
#define OPEN_APPEND 128
#define SEEK_SET 0 #define SEEK_SET 0
#define SEEK_CUR 1 #define SEEK_CUR 1
@ -154,6 +157,8 @@ void sys_open(Context* context, const char* filename, int flags)
VFS::Node* node = VFS::resolve_path(kfilename); VFS::Node* node = VFS::resolve_path(kfilename);
if (!node) if (!node)
{ {
bool create = (flags & OPEN_CREATE) > 0;
if (create) kwarnln("FIXME: open(O_CREAT) is not implemented");
kfree(kfilename); kfree(kfilename);
context->rax = -ENOENT; context->rax = -ENOENT;
return; return;
@ -173,6 +178,17 @@ void sys_open(Context* context, const char* filename, int flags)
bool only_directory = (flags & OPEN_DIRECTORY) > 0; bool only_directory = (flags & OPEN_DIRECTORY) > 0;
bool truncate = (flags & OPEN_TRUNCATED) > 0;
if (truncate)
{
kfree(kfilename);
kerrorln("FIXME: open(O_TRUNC) is not implemented");
context->rax = -ENOTSUP;
return;
}
bool append = (flags & OPEN_APPEND) > 0;
if (only_directory && node->type != VFS_DIRECTORY) if (only_directory && node->type != VFS_DIRECTORY)
{ {
kfree(kfilename); kfree(kfilename);
@ -188,6 +204,12 @@ void sys_open(Context* context, const char* filename, int flags)
kfree(kfilename); kfree(kfilename);
current_task->files[fd].open(node, can_read, can_write, able_to_block, close_on_exec); current_task->files[fd].open(node, can_read, can_write, able_to_block, close_on_exec);
if (append && current_task->files[fd].node()->type != VFS_DEVICE)
{
current_task->files[fd].seek((long)current_task->files[fd].length());
}
context->rax = fd; context->rax = fd;
return; return;
} }

6
libs/libc/include/fcntl.h
View File

@ -13,6 +13,12 @@
#define O_CLOEXEC 8 #define O_CLOEXEC 8
/* Refuse to open the file if it is not a directory. */ /* Refuse to open the file if it is not a directory. */
#define O_DIRECTORY 16 #define O_DIRECTORY 16
/* Truncate the file on open. */
#define O_TRUNC 32
/* Create the file if it doesn't exist. */
#define O_CREAT 64
/* Open the file for appending. */
#define O_APPEND 128
/* Duplicate a file descriptor. */ /* Duplicate a file descriptor. */
#define F_DUPFD 0 #define F_DUPFD 0