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options/posix: Implement readlink()

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This commit is contained in:
Alexander van der Grinten 2018-02-04 14:55:28 +01:00
parent e434a1241d
commit da8e31c1e5
3 changed files with 55 additions and 5 deletions
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1
options/internal/include/mlibc/sysdeps.hpp
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@ -22,6 +22,7 @@ int sys_dup2(int fd, int newfd);
int sys_stat(const char *pathname, struct stat *statbuf);
int sys_fstat(int fd, struct stat *statbuf);
int sys_readlink(const char *path, void *buffer, size_t max_size, ssize_t *length);
int sys_anon_allocate(size_t size, void **pointer);
int sys_anon_free(void *pointer, size_t size);

11
options/posix/generic/unistd-stubs.cpp
View file

@ -1,7 +1,6 @@
#include <unistd.h>
#include <bits/ensure.h>
#include <unistd.h>
#include <mlibc/sysdeps.hpp>
@ -176,9 +175,11 @@ ssize_t pwrite(int, const void *, size_t, off_t) {
__ensure(!"Not implemented");
__builtin_unreachable();
}
ssize_t readlink(const char *__restrict, char *__restrict, size_t) {
__ensure(!"Not implemented");
__builtin_unreachable();
ssize_t readlink(const char *__restrict path, char *__restrict buffer, size_t max_size) {
ssize_t length;
if(mlibc::sys_readlink(path, buffer, max_size, &length))
return -1;
return length;
}
ssize_t readlinkat(int, const char *__restrict, char *__restrict, size_t) {
__ensure(!"Not implemented");

48
sysdeps/managarm/generic/file.cpp
View file

@ -1686,5 +1686,53 @@ int sys_fstat(int fd, struct stat *result) {
return 0;
}
int sys_readlink(const char *path, void *data, size_t max_size, ssize_t *length) {
HelAction actions[4];
globalQueue.trim();
managarm::posix::CntRequest<MemoryAllocator> req(getAllocator());
req.set_request_type(managarm::posix::CntReqType::READLINK);
req.set_path(frigg::String<MemoryAllocator>(getAllocator(), path));
frigg::String<MemoryAllocator> ser(getAllocator());
req.SerializeToString(&ser);
actions[0].type = kHelActionOffer;
actions[0].flags = kHelItemAncillary;
actions[1].type = kHelActionSendFromBuffer;
actions[1].flags = kHelItemChain;
actions[1].buffer = ser.data();
actions[1].length = ser.size();
actions[2].type = kHelActionRecvInline;
actions[2].flags = kHelItemChain;
actions[3].type = kHelActionRecvToBuffer;
actions[3].flags = 0;
actions[3].buffer = data;
actions[3].length = max_size;
HEL_CHECK(helSubmitAsync(kHelThisThread, actions, 4,
globalQueue.getQueue(), 0, 0));
auto element = globalQueue.dequeueSingle();
auto offer = parseSimple(element);
auto send_req = parseSimple(element);
auto recv_resp = parseInline(element);
auto recv_data = parseLength(element);
HEL_CHECK(offer->error);
HEL_CHECK(send_req->error);
HEL_CHECK(recv_resp->error);
HEL_CHECK(recv_data->error);
managarm::posix::SvrResponse<MemoryAllocator> resp(getAllocator());
resp.ParseFromArray(recv_resp->data, recv_resp->length);
if(resp.error() == managarm::posix::Errors::ILLEGAL_ARGUMENTS) {
errno = EINVAL;
return -1;
}else{
__ensure(resp.error() == managarm::posix::Errors::SUCCESS);
*length = recv_data->length;
return 0;
}
}
} //namespace mlibc