46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
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#include "ELF.h"
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#include "Log.h"
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#include "fs/VFS.h"
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#include "memory/MemoryManager.h"
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#include "sys/Syscall.h"
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#include "thread/Scheduler.h"
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#include "thread/ThreadImage.h"
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#include <bits/modes.h>
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#include <luna/CString.h>
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#include <luna/ScopeGuard.h>
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Result<u64> sys_exec(Registers* regs, SyscallArgs args)
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{
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auto path = TRY(MemoryManager::strdup_from_user(args[0]));
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auto inode = TRY(VFS::resolve_path(path.chars()));
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// Not executable
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if ((inode->mode() & S_IXUSR) != S_IXUSR) return err(EACCES);
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kinfoln("exec: attempting to replace current image with %s", path.chars());
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auto current = Scheduler::current();
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auto image = TRY(ThreadImage::try_load_from_elf(inode));
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// From now on, nothing should fail.
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kinfoln("exec: image load ok, will now replace existing process image");
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// FIXME: Close only O_CLOEXEC file descriptors.
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for (int i = 0; i < FD_MAX; i++) { current->fd_table[i] = {}; }
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MMU::delete_userspace_page_directory(current->directory);
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image->apply(current);
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MMU::switch_page_directory(current->directory);
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memcpy(regs, ¤t->regs, sizeof(*regs));
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kinfoln("exec: done");
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return 0;
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}
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