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Add basic symlink support.

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- sys$readlink + readlink()
- Add a /proc/PID/exe symlink to the process's executable.
- Print symlink contents in ls output.
- Some work on plumbing options into VFS::open().
This commit is contained in:
Andreas Kling 2018-10-28 14:11:51 +01:00
parent 1d4af51250
commit 97726862dd
20 changed files with 140 additions and 46 deletions
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3
LibC/dirent.cpp
View file

@ -8,8 +8,7 @@ extern "C" {
DIR* opendir(const char* name)
{
// FIXME: Should fail if it's not a directory!
int fd = open(name);
int fd = open(name, O_RDONLY | O_DIRECTORY);
if (fd == -1)
return nullptr;
DIR* dirp = (DIR*)malloc(sizeof(dirp));

11
LibC/unistd.cpp
View file

@ -20,10 +20,9 @@ pid_t getpid()
return Syscall::invoke(Syscall::PosixGetpid);
}
int open(const char* path)
int open(const char* path, int options)
{
size_t length = strlen(path);
int rc = Syscall::invoke(Syscall::PosixOpen, (dword)path, (dword)length);
int rc = Syscall::invoke(Syscall::PosixOpen, (dword)path, (dword)options);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
@ -74,5 +73,11 @@ int gethostname(char* buffer, size_t size)
__RETURN_WITH_ERRNO(rc, rc, -1);
}
ssize_t readlink(const char* path, char* buffer, size_t size)
{
int rc = Syscall::invoke(Syscall::PosixReadlink, (dword)path, (dword)buffer, (dword)size);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
}

9
LibC/unistd.h
View file

@ -7,7 +7,7 @@ extern "C" {
uid_t getuid();
gid_t getgid();
pid_t getpid();
int open(const char* path);
int open(const char* path, int options);
ssize_t read(int fd, void* buf, size_t count);
int close(int fd);
pid_t waitpid(pid_t, int* wstatus, int options);
@ -16,6 +16,7 @@ char* getcwd(char* buffer, size_t size);
int lstat(const char* path, stat* statbuf);
int sleep(unsigned seconds);
int gethostname(char*, size_t);
ssize_t readlink(const char* path, char* buffer, size_t);
#define WEXITSTATUS(status) (((status) & 0xff00) >> 8)
#define WTERMSIG(status) ((status) & 0x7f)
@ -52,4 +53,10 @@ int gethostname(char*, size_t);
#define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
#define O_RDONLY 0
#define O_WRONLY 1
#define O_RDWR 2
#define O_DIRECTORY 00200000
#define O_NOFOLLOW 00400000
}