diff options
| -rw-r--r-- | sys/include/sys/filedesc.h | 7 | ||||
| -rw-r--r-- | sys/kern/kern_descrip.c | 35 |
2 files changed, 42 insertions, 0 deletions
diff --git a/sys/include/sys/filedesc.h b/sys/include/sys/filedesc.h index 60b638e..5f7e4e3 100644 --- a/sys/include/sys/filedesc.h +++ b/sys/include/sys/filedesc.h @@ -33,7 +33,13 @@ #include <sys/types.h> #if defined(_KERNEL) #include <sys/vnode.h> +#include <sys/syscall.h> #include <sys/spinlock.h> +#include <sys/syscall.h> + +#define SEEK_SET 0 +#define SEEK_CUR 1 +#define SEEK_END 2 struct filedesc { int fdno; @@ -51,6 +57,7 @@ int fd_write(unsigned int fd, void *buf, size_t count); int fd_alloc(struct filedesc **fd_out); int fd_open(const char *pathname, int flags); +off_t fd_seek(int fildes, off_t offset, int whence); int fd_dup(int fd); struct filedesc *fd_get(unsigned int fdno); diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c index 1992d46..1737b53 100644 --- a/sys/kern/kern_descrip.c +++ b/sys/kern/kern_descrip.c @@ -296,3 +296,38 @@ fd_dup(int fd) new_desc->vp = tmp->vp; return new_desc->fdno; } + +off_t +fd_seek(int fildes, off_t offset, int whence) +{ + struct filedesc *tmp; + struct vattr attr; + struct vop_getattr_args getattr_args; + + tmp = fd_get(fildes); + if (tmp == NULL) { + return -EBADF; + } + + getattr_args.vp = tmp->vp; + getattr_args.res = &attr; + if ((vfs_vop_getattr(tmp->vp, &getattr_args)) < 0) { + return -EPIPE; + } + + switch (whence) { + case SEEK_SET: + tmp->offset = offset; + break; + case SEEK_CUR: + tmp->offset += offset; + break; + case SEEK_END: + tmp->offset = attr.size + offset; + break; + default: + return -EINVAL; + } + + return 0; +} |