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/* ISC license. */
#include <unistd.h>
#include <errno.h>
#include <sys/wait.h>
#include <skalibs/strerr2.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/djbunix.h>
#define USAGE "s6-fghack prog..."
int main (int argc, char const *const *argv, char const *const *envp)
{
int p[2] ;
int pcoe[2] ;
pid_t pid ;
char dummy ;
PROG = "s6-fghack" ;
if (argc < 2) strerr_dieusage(100, USAGE) ;
if (pipe(p) < 0) strerr_diefu1sys(111, "create hackpipe") ;
if (pipe(pcoe) < 0) strerr_diefu1sys(111, "create coepipe") ;
switch (pid = fork())
{
case -1 : strerr_diefu1sys(111, "fork") ;
case 0 :
{
int i = 0 ;
fd_close(p[0]) ;
fd_close(pcoe[0]) ;
if (coe(pcoe[1]) < 0) _exit(111) ;
for (; i < 30 ; i++) dup(p[1]) ; /* hack. gcc's warning is justified. */
pathexec_run(argv[1], argv+1, envp) ;
i = errno ;
if (fd_write(pcoe[1], "", 1) < 1) _exit(111) ;
_exit(i) ;
}
}
fd_close(p[1]) ;
fd_close(pcoe[1]) ;
switch (fd_read(pcoe[0], &dummy, 1))
{
case -1 : strerr_diefu1sys(111, "read on coepipe") ;
case 1 :
{
int wstat ;
if (wait_pid(pid, &wstat) < 0) strerr_diefu1sys(111, "wait_pid") ;
errno = WEXITSTATUS(wstat) ;
strerr_dieexec(111, argv[1]) ;
}
}
fd_close(pcoe[0]) ;
p[1] = fd_read(p[0], &dummy, 1) ;
if (p[1] < 0) strerr_diefu1sys(111, "read on hackpipe") ;
if (p[1]) strerr_dief2x(102, argv[1], " wrote on hackpipe") ;
{
int wstat ;
if (wait_pid(pid, &wstat) < 0) strerr_diefu1sys(111, "wait_pid") ;
if (WIFSIGNALED(wstat)) strerr_dief2x(111, argv[2], " crashed") ;
return WEXITSTATUS(wstat) ;
}
}
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