danielandClaude Fable 5
75184e0651
Groundwork for the GCC driver: a compiler driver must spawn cc1/as/ld and know whether each stage succeeded. Kernel: the scheduler keeps an exit-code ledger (pid -> code; pids are monotonic so entries never alias), published during teardown right before waiters wake. SYS_EXIT records main()'s return value, SYS_KILL records 256+SIGKILL, and the exception handler records 256+signal mapped from the fault vector (#PF/#GP -> SIGSEGV, #DE/FP -> SIGFPE, #UD -> SIGILL). SYS_WAITPID now returns the code: 0..255 for a normal exit, 256+signal for a violent death. Process args grow from 256 bytes to 4 KiB (cc1 invocations do not fit in 256), with crt1 now parsing up to 255 argv entries from a static buffer. libc: new spawn.h with posix_spawn/posix_spawnp over SYS_SPAWN - libiberty's pex layer has a posix_spawn backend, so GCC's driver works without fork. argv is joined into the kernel args string (spaces in arguments rejected; no kernel quoting), envp is not transferred, and non-empty file actions fail loudly with ENOTSUP until the kernel can redirect stdio on spawn. waitpid() now decodes real POSIX status and the sys/wait.h macros distinguish exited from signaled children. Shell: prints [exit code N] after nonzero exits and [terminated by signal N] for killed or crashed children. Verified on the OS: cat on a missing file reports exit code 1; a window-close (clean exit 0) stays silent as it should. Co-Authored-By: Claude Fable 5 <[email protected]>
61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
#ifndef _LIBC_SPAWN_H
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#define _LIBC_SPAWN_H
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#pragma once
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#include <sys/types.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* posix_spawn for MontaukOS, layered on SYS_SPAWN.
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*
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* Limitations (kernel spawn model):
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* - argv is joined into a single args string; arguments containing
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* spaces are rejected with EINVAL (no quoting in the kernel).
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* - envp is ignored (no environment transfer on spawn).
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* - file actions must be empty: stdio redirection needs kernel
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* support that does not exist yet, so any recorded action makes
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* posix_spawn fail with ENOTSUP rather than misbehave silently.
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*/
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typedef struct {
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short flags;
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} posix_spawnattr_t;
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typedef struct {
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int action_count;
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} posix_spawn_file_actions_t;
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int posix_spawnattr_init(posix_spawnattr_t *attr);
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int posix_spawnattr_destroy(posix_spawnattr_t *attr);
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int posix_spawnattr_setflags(posix_spawnattr_t *attr, short flags);
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int posix_spawnattr_getflags(const posix_spawnattr_t *attr, short *flags);
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int posix_spawn_file_actions_init(posix_spawn_file_actions_t *actions);
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int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *actions);
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int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *actions,
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int fd, int newfd);
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int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *actions,
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int fd);
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int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *actions,
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int fd, const char *path, int oflag,
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mode_t mode);
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int posix_spawn(pid_t *pid, const char *path,
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const posix_spawn_file_actions_t *actions,
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const posix_spawnattr_t *attr,
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char *const argv[], char *const envp[]);
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int posix_spawnp(pid_t *pid, const char *file,
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const posix_spawn_file_actions_t *actions,
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const posix_spawnattr_t *attr,
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char *const argv[], char *const envp[]);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _LIBC_SPAWN_H */
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