ref: c9863f0ad35ee6a63c25f2b43cd208e3317aa3af
dir: /sys/src/libc/9sys/postnote.c/
#include <u.h> #include <libc.h> int postnote(int group, int pid, char *note) { char file[32]; int f, r; switch(group) { case PNPROC: snprint(file, sizeof(file), "/proc/%lud/note", (ulong)pid); break; case PNGROUP: snprint(file, sizeof(file), "/proc/%lud/notepg", (ulong)pid); break; default: return -1; } f = open(file, OWRITE|OCEXEC); if(f < 0) return -1; r = strlen(note); if(write(f, note, r) != r) { close(f); return -1; } close(f); return 0; }