diff options
Diffstat (limited to 'src/sys/os/os_filedes.c')
-rw-r--r-- | src/sys/os/os_filedes.c | 88 |
1 files changed, 69 insertions, 19 deletions
diff --git a/src/sys/os/os_filedes.c b/src/sys/os/os_filedes.c index 95452af..3eaee0d 100644 --- a/src/sys/os/os_filedes.c +++ b/src/sys/os/os_filedes.c @@ -44,16 +44,9 @@ #define STDOUT_FILENO 1 /* - * Allocate a file descriptor from a specific process's - * file descriptor table - * - * @procp: Process to allocate fd from - * @fd_res: Result pointer is written here - * - * Returns zero on success, otherwise a less than - * zero value upon failure + * Allocate a file descriptor */ -static int +int fd_alloc(struct proc *procp, struct filedesc **fd_res) { struct filedesc *fd; @@ -91,16 +84,9 @@ fd_alloc(struct proc *procp, struct filedesc **fd_res) } /* - * Look up a file descriptor that belongs to a specific - * process by using its fd number - * - * @procp: Process to look up - * @fd: File descriptor number - * - * Returns the file descriptor pointer on success, - * otherwise a less than zero value on failure + * Get a file descriptor */ -static struct filedesc * +struct filedesc * fd_get(struct proc *procp, int fd) { struct filedesc *fdp; @@ -160,8 +146,10 @@ fd_open(const char *path, mode_t mode) { struct filedesc *fd; struct nameidata nd; + struct vop_create_args creat_args; struct proc *self = proc_self(); struct vnode *vp; + uint32_t namei_flags = 0; int error; /* We need the current proc */ @@ -180,12 +168,21 @@ fd_open(const char *path, mode_t mode) } /* + * If we are creating a new file, we'll need to + * get the parent vnode so that we can use the + * create vop. + */ + if (ISSET(mode, O_CREAT)) { + namei_flags |= NAMEI_CREATE; + } + + /* * Now we try to do the lookup, we'll need * the vnode for file references to be * useful */ nd.path = path; - nd.flags = 0; + nd.flags = namei_flags; nd.vp_res = &vp; error = namei(&nd); if (error < 0) { @@ -348,6 +345,44 @@ read(int fd, void *buf, size_t count) return retval; } +off_t +lseek(int fd, off_t offset, int whence) +{ + struct filedesc *fdp; + struct proc *self = proc_self(); + struct vattr attr; + int error; + + if (fd < 0) { + return -EBADF; + } + + fdp = fd_get(self, fd); + if (fdp == NULL) { + return -EBADF; + } + + /* Could not get vnode attributes */ + error = vop_getattr(fdp->vp, &attr); + if (error < 0) { + return 0; + } + + switch (whence) { + case SEEK_SET: + fdp->off = offset; + break; + case SEEK_CUR: + fdp->off += offset; + break; + case SEEK_END: + fdp->off = attr.size; + break; + } + + return fdp->off; +} + /* * ARG0: Path * ARG1: Mode @@ -367,3 +402,18 @@ sys_open(struct syscall_args *scargs) return fd_open(pathbuf, mode); } + +/* + * ARG0: Fd + * ARG1: Offset + * ARG2: Whence + */ +scret_t +sys_lseek(struct syscall_args *scargs) +{ + int fd = SCARG(scargs, int, 0); + off_t off = SCARG(scargs, off_t, 1); + int whence = SCARG(scargs, int, 2); + + return lseek(fd, off, whence); +} |