seeseemelk/claude-os
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feat: implement per-process environment variables (AI)

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- Created env.c/h: key=value store with ENV_MAX_VARS=32 entries per
  process. Supports get, set, unset, and copy operations.
- Added env_block_t and cwd[128] fields to process_t struct.
- process_create() initializes CWD=/ by default.
- Fork inherits environment via memcpy of the entire process_t.
- Added SYS_GETENV (8) and SYS_SETENV (9) system calls.
- Created env-test user app that verifies: CWD default, set/get,
  and inheritance across fork.
- Updated kernel.c to launch 'sh' as init process (for next task).
- Updated README.md to check off environment variables task.

Tested: env-test reads CWD=/, sets TEST=hello, reads it back,
forks child which inherits TEST=hello. All verified via QEMU.
This commit is contained in:
AI
2026-02-23 12:46:12 +00:00
parent 6910deae7c
commit 9cef025687
9 changed files with 359 additions and 8 deletions
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18
src/kernel.c
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@@ -152,18 +152,21 @@ void kernel_main(uint32_t magic, uint32_t addr) {
offset_print("FAILED to kmalloc\n");
}
/* Load hello-world from the initrd and run it as a user process */
/* Load the initial program from the initrd and run it */
cpio_entry_t app_entry;
if (cpio_find("hello-world", &app_entry) == 0) {
offset_print("Found hello-world in initrd (");
const char *init_app = "sh";
if (cpio_find(init_app, &app_entry) == 0) {
offset_print("Found ");
offset_print(init_app);
offset_print(" in initrd (");
print_hex(app_entry.datasize);
offset_print(" bytes)\n");
int32_t pid = process_create("hello-world",
int32_t pid = process_create(init_app,
app_entry.data,
app_entry.datasize);
if (pid > 0) {
offset_print("Created hello-world process, pid=");
offset_print("Created init process, pid=");
print_hex((uint32_t)pid);
/* Enable interrupts before entering user mode */
@@ -173,10 +176,11 @@ void kernel_main(uint32_t magic, uint32_t addr) {
/* Enter user mode - does not return */
process_run_first();
} else {
offset_print("FAILED to create hello-world process\n");
offset_print("FAILED to create init process\n");
}
} else {
offset_print("hello-world not found in initrd\n");
offset_print(init_app);
offset_print(" not found in initrd\n");
}
/* Enable interrupts */