code wiki / _hdl_build / nx_openat_probe.nx
nx_openat_probe.nx
buildroot/runtime/_hdl_build/nx_openat_probe.nx
about
nx_openat_probe.nx -- pins the EXACT root cause of finding F1 (project-nishi-eng-findings-2026-06-23) for the
toolchain engineer. The symptom: a raw openat that returned fd>=0 but whose write didn't land. Isolate the two
suspects -- the inline `"literal" as *u8 as i64` cast vs the O_APPEND flag -- with otherwise-identical opens:
A: inline literal double-cast + O_APPEND B: path VARIABLE + O_APPEND C: path variable + O_TRUNC
Whichever opens write 1 byte tells the team precisely which axis is broken. license_tier: ORIGINAL expect_exit: 0
dependencies 1 imports · 0 importers
imports: nx_syscalls.nx
imported by: nobody (leaf or entry point)
call flow from main pre-order; caps 40 nodes / depth 6 declared; ↻ = already shown
structs
| none |
consts
| none |
functions
| 8 | func w(s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(1,s,n); return 0 } |
| 9 | func wn(v: i64) -> i64 { var m: i64=v; if m<0{w("-" as *u8);m=0-m} let t:*u8=sys_mmap(24); var k:i64=0; if m==0{t[0]=48 as u8;k=1} while m>0{t[k]=(48+(m%10)) as u8;m=m/10;k=k+1} var i:i64=0; let o:*u8=sys_mmap(24); while i<k{o[i]=t[k-1-i];i=i+1} sys_write(1,o,k); return 0 } |
| 10 | func dun(p: *u8) -> i64 { __syscall(87, p as i64, 0, 0, 0, 0, 0); return 0 } called by 1: main |
| 11 | func bytes(p: *u8) -> i64 { let lp: *i64 = sys_mmap(8) as *i64; let d: *u8 = sys_read_file(p, lp); if (d as i64)==0 { return 0 } return lp[0] } |
| 13 | func main(argc: i64, argv: *i64) -> i64 |