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Factor out the "non-syscall" parts of sys$execve() into exec().

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..to prepare for sharing code with createUserProcess().
This commit is contained in:
Andreas Kling 2018-11-03 10:20:23 +01:00
parent 8f51f0e6b2
commit c5eec9cbfc
Notes: sideshowbarker 2024-07-19 18:34:09 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/c5eec9cbfc3
2 changed files with 41 additions and 33 deletions
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73
Kernel/Process.cpp
View File

@ -282,21 +282,8 @@ pid_t Process::sys$fork(RegisterDump& regs)
return child->pid();
}
int Process::sys$execve(const char* filename, const char** argv, const char** envp)
int Process::exec(const String& path, Vector<String>&& arguments, Vector<String>&& environment)
{
VALIDATE_USER_READ(filename, strlen(filename));
if (argv) {
for (size_t i = 0; argv[i]; ++i) {
VALIDATE_USER_READ(argv[i], strlen(argv[i]));
}
}
if (envp) {
for (size_t i = 0; envp[i]; ++i) {
VALIDATE_USER_READ(envp[i], strlen(envp[i]));
}
}
String path(filename);
auto parts = path.split('/');
if (parts.isEmpty())
return -ENOENT;
@ -315,22 +302,6 @@ int Process::sys$execve(const char* filename, const char** argv, const char** en
if (!elfData)
return -EIO; // FIXME: Get a more detailed error from VFS.
Vector<String> processArguments;
if (argv) {
for (size_t i = 0; argv[i]; ++i) {
processArguments.append(argv[i]);
}
} else {
processArguments.append(parts.last());
}
Vector<String> processEnvironment;
if (envp) {
for (size_t i = 0; envp[i]; ++i) {
processEnvironment.append(envp[i]);
}
}
dword entry_eip = 0;
PageDirectory* old_page_directory;
PageDirectory* new_page_directory;
@ -414,11 +385,11 @@ int Process::sys$execve(const char* filename, const char** argv, const char** en
MM.release_page_directory(*old_page_directory);
m_executable = handle->vnode();
m_arguments = move(processArguments);
m_initialEnvironment = move(processEnvironment);
m_arguments = move(arguments);
m_initialEnvironment = move(environment);
#ifdef TASK_DEBUG
kprintf("Process %u (%s) execve'd %s @ %p\n", pid(), name().characters(), filename, m_tss.eip);
kprintf("Process %u (%s) exec'd %s @ %p\n", pid(), name().characters(), filename, m_tss.eip);
#endif
yield();
@ -426,6 +397,42 @@ int Process::sys$execve(const char* filename, const char** argv, const char** en
return 0;
}
int Process::sys$execve(const char* filename, const char** argv, const char** envp)
{
VALIDATE_USER_READ(filename, strlen(filename));
if (argv) {
for (size_t i = 0; argv[i]; ++i) {
VALIDATE_USER_READ(argv[i], strlen(argv[i]));
}
}
if (envp) {
for (size_t i = 0; envp[i]; ++i) {
VALIDATE_USER_READ(envp[i], strlen(envp[i]));
}
}
String path(filename);
auto parts = path.split('/');
Vector<String> arguments;
if (argv) {
for (size_t i = 0; argv[i]; ++i) {
arguments.append(argv[i]);
}
} else {
arguments.append(parts.last());
}
Vector<String> environment;
if (envp) {
for (size_t i = 0; envp[i]; ++i) {
environment.append(envp[i]);
}
}
return exec(path, move(arguments), move(environment));
}
int Process::sys$spawn(const char* path, const char** args)
{
if (args) {

1
Kernel/Process.h
View File

@ -158,6 +158,7 @@ public:
void send_signal(int signal, Process* sender);
Process* fork(RegisterDump&);
int exec(const String& path, Vector<String>&& arguments, Vector<String>&& environment);
private:
friend class MemoryManager;