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/* ISC license. */
#include <skalibs/nonposix.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <signal.h>
#include <skalibs/sgetopt.h>
#include <skalibs/types.h>
#include <skalibs/nsig.h>
#include <skalibs/sig.h>
#include <skalibs/strerr2.h>
#include <skalibs/tai.h>
#include <skalibs/iopause.h>
#include <skalibs/selfpipe.h>
#include <skalibs/env.h>
#include <skalibs/djbunix.h>
#include <execline/execline.h>
#define USAGE "trap [ -x ] [ -t timeout ] { signal { cmdline } ... } prog..."
#define dieusage() strerr_dieusage(100, USAGE) ;
static pid_t pids[SKALIBS_NSIG + 1] ;
static char const *const *argvs[SKALIBS_NSIG] ;
static void action (unsigned int i, char const *const *envp)
{
if (argvs[i])
{
if (!pids[i])
{
pids[i] = child_spawn0(argvs[i][0], argvs[i], envp) ;
if (!pids[i]) strerr_diefu2sys(111, "spawn ", argvs[i][0]) ;
}
}
else kill(pids[SKALIBS_NSIG], i) ;
}
int main (int argc, char const **argv, char const *const *envp)
{
tain_t tto ;
int xfersigs = 0 ;
int argc1, spfd ;
unsigned int i = SKALIBS_NSIG + 1 ;
PROG = "trap" ;
{
unsigned int t = 0 ;
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "xt:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'x' : xfersigs = 1 ; break ;
case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
if (t) tain_from_millisecs(&tto, t) ;
else tto = tain_infinite_relative ;
}
if (!argc) dieusage() ;
argc1 = el_semicolon(argv) ;
if (!argc1) strerr_dief1x(100, "empty block") ;
if (argc1 >= argc) strerr_dief1x(100, "unterminated block") ;
if (argc1 + 1 == argc) dieusage() ;
argv[argc1] = 0 ;
while (i--) argvs[i] = 0 ;
i = 0 ;
tain_now_g() ;
spfd = selfpipe_init() ;
if (spfd < 0) strerr_diefu1sys(111, "selfpipe_init") ;
while (i < (unsigned int)argc1)
{
int argc2 ;
unsigned int sig = (unsigned int)sig_number(argv[i] + (strncasecmp(argv[i], "sig", 3) ? 0 : 3)) ;
if (!sig && !uint0_scan(argv[i], &sig) && strcasecmp(argv[i], "timeout"))
strerr_dief3x(100, "unrecognized", " directive: ", argv[i]) ;
argc2 = el_semicolon(argv + ++i) ;
if (!argc2)
strerr_dief3x(100, "empty", " internal block for directive ", argv[i-1]) ;
if (i + argc2 >= argc1)
strerr_dief3x(100, "unterminated", " internal block for directive ", argv[i-1]) ;
if (argvs[sig])
strerr_dief3x(100, "duplicate", " directive: ", argv[i-1]) ;
if (sig && selfpipe_trap(sig) < 0)
strerr_diefu2sys(111, "trap ", argv[i-1]) ;
argv[i + argc2] = 0 ;
argvs[sig] = argv + i ;
i += argc2 + 1 ;
}
if (!argvs[SIGCHLD] && selfpipe_trap(SIGCHLD) < 0)
strerr_diefu2sys(111, "trap ", "SIGCHLD") ;
if (xfersigs)
{
sigset_t full ;
sigfillset(&full) ;
sigdelset(&full, SIGCHLD) ;
sigdelset(&full, SIGKILL) ;
sigdelset(&full, SIGSTOP) ;
for (i = 1 ; i < SKALIBS_NSIG ; i++)
if (!argvs[i] && sigismember(&full, i) > 0 && selfpipe_trap(i) < 0)
{
char fmt[UINT_FMT] ;
fmt[uint_fmt(fmt, i)] = 0 ;
strerr_diefu4sys(111, "auto-", "trap ", "signal ", fmt) ;
}
}
pids[NSIG] = child_spawn0(argv[argc1 + 1], argv + argc1 + 1, envp) ;
if (!pids[NSIG]) strerr_diefu2sys(111, "spawn ", argv[argc1 + 1]) ;
{
iopause_fd x = { .fd = spfd, .events = IOPAUSE_READ } ;
size_t envlen = env_len(envp) ;
char modif[2 + PID_FMT] = "!=" ;
size_t l = 2 + pid_fmt(modif + 2, pids[SKALIBS_NSIG]) ;
char const *newenvp[envlen + 2] ;
modif[l++] = 0 ;
if (!env_merge(newenvp, envlen + 2, envp, envlen, modif, l))
strerr_diefu1sys(111, "adjust environment") ;
for (;;)
{
tain_t deadline ;
int r ;
tain_add_g(&deadline, &tto) ;
r = iopause_g(&x, 1, &deadline) ;
if (r < 0) strerr_diefu1sys(111, "iopause") ;
if (!r) action(0, newenvp) ;
else
{
int cont = 1 ;
while (cont)
{
r = selfpipe_read() ;
switch (r)
{
case -1 : strerr_diefu1sys(111, "selfpipe_read") ;
case 0 : cont = 0 ; break ;
case SIGCHLD :
for (;;)
{
int wstat ;
ssize_t id = wait_pids_nohang(pids, SKALIBS_NSIG + 1, &wstat) ;
if (id < 0 && errno != ECHILD)
strerr_diefu1sys(111, "wait") ;
if (id <= 0) break ;
pids[id - 1] = 0 ;
if (id == SKALIBS_NSIG + 1) return wait_estatus(wstat) ;
}
if (!argvs[SIGCHLD]) break ;
default :
action(r, newenvp) ;
}
}
}
}
}
}
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