static void handle_control (int fd)
{
for (;;)
{
char c ;
int r = sanitize_read(fd_read(fd, &c, 1)) ;
if (r == -1) panic("read control pipe") ;
else if (!r) break ;
else switch (c)
{
case 'p' : finish_arg = "poweroff" ; break ;
case 'h' : hup() ; return ;
case 'r' : finish_arg = "reboot" ; break ;
case 'a' : wantscan = 1 ; break ;
case 't' : term() ; return ;
case 's' : finish_arg = "halt" ; break ;
case 'z' : wantreap = 1 ; break ;
case 'b' : cont = 0 ; return ;
case 'n' : wantkill = 2 ; break ;
case 'N' : wantkill = 6 ; break ;
case '6' :
case 'i' : intr() ; return ;
case 'q' : quit() ; return ;
case '0' : finish_arg = "halt" ; term() ; return ;
case '7' : usr1() ; return ;
case '8' : finish_arg = "other" ; term() ; return ;
default :
{
char s[2] = { c, 0 } ;
strerr_warnw2x("received unknown control command: ", s) ;
}
}
}
}
static void panicnosp (char const *errmsg)
{
char const *eargv[2] = { CRASH_PROG, 0 } ;
strerr_warnwu1sys(errmsg) ;
strerr_warnw2x("executing into ", eargv[0]) ;
execve(eargv[0], (char *const *)eargv, (char *const *)environ) ;
/* and if that execve fails, screw it and just die */
strerr_dieexec(111, eargv[0]) ;
}
int main (int argc, char const *const *argv, char const *const *envp)
{
char data[DATASIZE+1] = "-" ;
unsigned int datalen = 1 ;
unsigned int timeout = 0 ;
char updown[3] = "-\0" ;
PROG = "s6-svc" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
register int opt = subgetopt_r(argc, argv, "abqhkti12pcoduxOXyT:w:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'a' :
case 'b' :
case 'q' :
case 'h' :
case 'k' :
case 't' :
case 'i' :
case '1' :
case '2' :
case 'p' :
case 'c' :
case 'o' :
case 'd' :
case 'u' :
case 'x' :
case 'O' :
case 'X' :
case 'y' :
{
if (datalen >= DATASIZE) strerr_dief1x(100, "too many commands") ;
data[datalen++] = opt ;
break ;
}
case 'T' : if (!uint0_scan(l.arg, &timeout)) dieusage() ; break ;
case 'w' :
{
if (byte_chr("dDuUrR", 6, l.arg[0]) >= 6) dieusage() ;
updown[1] = l.arg[0] ;
break ;
}
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if (!argc) dieusage() ;
if (argc > 1) strerr_warn1x("ignoring extra arguments") ;
if (datalen <= 1) return 0 ;
if (updown[1] == 'U' || updown[1] == 'R')
{
unsigned int arglen = str_len(argv[0]) ;
char fn[arglen + 17] ;
byte_copy(fn, arglen, argv[0]) ;
byte_copy(fn + arglen, 17, "/notification-fd") ;
if (access(fn, F_OK) < 0)
{
if (errno != ENOENT) strerr_diefu2sys(111, "access ", fn) ;
updown[1] = updown[1] == 'U' ? 'u' : 'r' ;
strerr_warnw2x(fn, " not present - ignoring request for readiness notification") ;
}
}
if (updown[1])
{
char const *newargv[11] ;
unsigned int m = 0 ;
char fmt[UINT_FMT] ;
newargv[m++] = S6_BINPREFIX "s6-svlisten1" ;
newargv[m++] = updown ;
if (timeout)
{
fmt[uint_fmt(fmt, timeout)] = 0 ;
newargv[m++] = "-t" ;
newargv[m++] = fmt ;
}
newargv[m++] = "--" ;
newargv[m++] = argv[0] ;
newargv[m++] = S6_BINPREFIX "s6-svc" ;
newargv[m++] = data ;
newargv[m++] = "--" ;
newargv[m++] = argv[0] ;
newargv[m++] = 0 ;
pathexec_run(newargv[0], newargv, envp) ;
strerr_dieexec(111, newargv[0]) ;
}
else
{
register int r = s6_svc_writectl(argv[0], S6_SUPERVISE_CTLDIR, data + 1, datalen - 1) ;
if (r < 0) strerr_diefu2sys(111, "control ", argv[0]) ;
else if (!r) strerr_diefu3x(100, "control ", argv[0], ": supervisor not listening") ;
}
return 0 ;
}