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syscalls: pread and pwrite

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Matheus
2024-06-23 20:21:29 -03:00
parent a897a51e2b
commit 9f48a87ae8
5 changed files with 145 additions and 7 deletions
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kernel-src/sys/syscalls/pread.c
+56
View File
@@ -0,0 +1,56 @@
#include <kernel/syscalls.h>
#include <kernel/vfs.h>
#include <kernel/file.h>
#include <arch/cpu.h>
#include <errno.h>
#include <logging.h>
syscallret_t syscall_pread(context_t *context, int fd, void *buffer, size_t size, uintmax_t offset) {
syscallret_t ret = {
.ret = -1
};
void *kernelbuff = vmm_map(NULL, size, VMM_FLAGS_ALLOCATE, ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_NOEXEC, NULL);
if (kernelbuff == NULL) {
ret.errno = ENOMEM;
return ret;
}
file_t *file = fd_get(fd);
if (file == NULL || (file->flags & FILE_READ) == 0) {
ret.errno = EBADF;
goto cleanup;
}
if (size == 0) {
ret.ret = 0;
ret.errno = 0;
goto cleanup;
}
size_t tmp;
if (file->vnode->type == V_TYPE_SOCKET || file->vnode->type == V_TYPE_FIFO || (file->vnode->type == V_TYPE_CHDEV && VOP_MAXSEEK(file->vnode, &tmp))) {
ret.errno = ESPIPE;
goto cleanup;
}
vattr_t attr;
VOP_GETATTR(file->vnode, &attr, NULL);
size_t bytesread;
ret.errno = vfs_read(file->vnode, kernelbuff, size, offset, &bytesread, fileflagstovnodeflags(file->flags));
if (ret.errno)
goto cleanup;
ret.errno = usercopy_touser(buffer, kernelbuff, bytesread);
ret.ret = ret.errno ? -1 : bytesread;
cleanup:
if (file)
fd_release(file);
vmm_unmap(kernelbuff, size, 0);
return ret;
}
kernel-src/sys/syscalls/pwrite.c
+54
View File
@@ -0,0 +1,54 @@
#include <kernel/syscalls.h>
#include <kernel/vfs.h>
#include <kernel/file.h>
#include <errno.h>
syscallret_t syscall_pwrite(context_t *context, int fd, void *buffer, size_t size, uintmax_t offset) {
syscallret_t ret = {
.ret = -1
};
void *kernelbuff = vmm_map(NULL, size, VMM_FLAGS_ALLOCATE, ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_NOEXEC, NULL);
if (kernelbuff == NULL) {
ret.errno = ENOMEM;
return ret;
}
file_t *file = fd_get(fd);
if (file == NULL || (file->flags & FILE_WRITE) == 0) {
ret.errno = EBADF;
goto cleanup;
}
if (size == 0) {
ret.ret = 0;
ret.errno = 0;
goto cleanup;
}
ret.errno = usercopy_fromuser(kernelbuff, buffer, size);
if (ret.errno)
goto cleanup;
size_t tmp;
if (file->vnode->type == V_TYPE_SOCKET || file->vnode->type == V_TYPE_FIFO || (file->vnode->type == V_TYPE_CHDEV && VOP_MAXSEEK(file->vnode, &tmp))) {
ret.errno = ESPIPE;
goto cleanup;
}
size_t byteswritten;
ret.errno = vfs_write(file->vnode, kernelbuff, size, offset, &byteswritten, fileflagstovnodeflags(file->flags));
if (ret.errno)
goto cleanup;
ret.ret = byteswritten;
ret.errno = 0;
cleanup:
if (file)
fd_release(file);
vmm_unmap(kernelbuff, size, 0);
return ret;
}