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]>
32 lines
673 B
C
32 lines
673 B
C
#ifndef _LIBC_SYS_WAIT_H
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#define _LIBC_SYS_WAIT_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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/* POSIX status decoding. waitpid() encodes a normal exit as code<<8
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and a killed/crashed child as the signal number in the low bits. */
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#define WIFEXITED(s) (((s) & 0x7F) == 0)
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#define WEXITSTATUS(s) (((s) >> 8) & 0xFF)
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#define WIFSIGNALED(s) (((s) & 0x7F) != 0)
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#define WTERMSIG(s) ((s) & 0x7F)
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#define WIFSTOPPED(s) (0)
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#define WSTOPSIG(s) (0)
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#define WNOHANG 1
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#define WUNTRACED 2
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pid_t wait(int *status);
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pid_t waitpid(pid_t pid, int *status, int options);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _LIBC_SYS_WAIT_H */
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