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Clean up some of the threading code

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Justine Tunney 2022-09-08 11:54:56 -07:00
parent 0547eabcd6
commit 9f963dc597
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GPG key ID: BE714B4575D6E328
62 changed files with 175 additions and 582 deletions
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18
libc/calls/symlinkat-nt.c
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@ -19,7 +19,7 @@
#include "libc/calls/calls.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/errno.h"
#include "libc/intrin/once.h"
#include "libc/intrin/pthread.h"
#include "libc/nt/enum/accessmask.h"
#include "libc/nt/enum/fileflagandattributes.h"
#include "libc/nt/enum/symboliclink.h"
@ -35,17 +35,20 @@
__msabi extern typeof(GetFileAttributes) *const __imp_GetFileAttributesW;
static bool AllowedToCreateSymlinks(void) {
static _Bool g_winlink_allowed;
static pthread_once_t g_winlink_once;
static textwindows void InitializeWinlink(void) {
int64_t tok;
struct NtLuid id;
struct NtTokenPrivileges tp;
if (!OpenProcessToken(GetCurrentProcess(), kNtTokenAllAccess, &tok)) return 0;
if (!LookupPrivilegeValue(0, u"SeCreateSymbolicLinkPrivilege", &id)) return 0;
if (!OpenProcessToken(GetCurrentProcess(), kNtTokenAllAccess, &tok)) return;
if (!LookupPrivilegeValue(0, u"SeCreateSymbolicLinkPrivilege", &id)) return;
tp.PrivilegeCount = 1;
tp.Privileges[0].Luid = id;
tp.Privileges[0].Attributes = kNtSePrivilegeEnabled;
if (!AdjustTokenPrivileges(tok, 0, &tp, sizeof(tp), 0, 0)) return 0;
return GetLastError() != kNtErrorNotAllAssigned;
if (!AdjustTokenPrivileges(tok, 0, &tp, sizeof(tp), 0, 0)) return;
g_winlink_allowed = GetLastError() != kNtErrorNotAllAssigned;
}
textwindows int sys_symlinkat_nt(const char *target, int newdirfd,
@ -79,7 +82,8 @@ textwindows int sys_symlinkat_nt(const char *target, int newdirfd,
// windows only lets administrators do this
// even then we're required to ask for permission
if (!_once(AllowedToCreateSymlinks())) {
pthread_once(&g_winlink_once, InitializeWinlink);
if (!g_winlink_allowed) {
return eperm();
}