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Kernel+LibC+LibCore+UE: Implement fchmodat(2)

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This function is an extended version of `chmod(2)` that lets one control
whether to dereference symlinks, and specify a file descriptor to a
directory that will be used as the base for relative paths.
This commit is contained in:
Daniel Bertalan 2022-01-11 16:51:34 +01:00 • committed by Andreas Kling
parent 5f71925aa4
commit 182016d7c0
10 changed files with 64 additions and 14 deletions
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13
Userland/DevTools/UserspaceEmulator/Emulator_syscalls.cpp
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@ -52,7 +52,7 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
case SC_chdir:
return virt$chdir(arg1, arg2);
case SC_chmod:
return virt$chmod(arg1, arg2, arg3);
return virt$chmod(arg1);
case SC_chown:
return virt$chown(arg1);
case SC_clock_gettime:
@ -418,10 +418,15 @@ int Emulator::virt$dbgputstr(FlatPtr characters, int length)
return 0;
}
int Emulator::virt$chmod(FlatPtr path_addr, size_t path_length, mode_t mode)
int Emulator::virt$chmod(FlatPtr params_addr)
{
auto path = mmu().copy_buffer_from_vm(path_addr, path_length);
return syscall(SC_chmod, path.data(), path.size(), mode);
Syscall::SC_chmod_params params;
mmu().copy_from_vm(&params, params_addr, sizeof(params));
auto path = mmu().copy_buffer_from_vm((FlatPtr)params.path.characters, params.path.length);
params.path.characters = (char const*)path.data();
params.path.length = path.size();
return syscall(SC_chmod, &params);
}
int Emulator::virt$chown(FlatPtr params_addr)