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/* ISC license. */
#include <sys/types.h>
#include <unistd.h>
#ifdef EXECLINE_OLD_VARNAMES
#include <skalibs/bytestr.h>
#endif
#include <skalibs/sgetopt.h>
#include <skalibs/uint64.h>
#include <skalibs/strerr2.h>
#include <skalibs/env.h>
#include <skalibs/djbunix.h>
#include <execline/execline.h>
#define USAGE "pipeline [ -d ] [ -r | -w ] { command... } command..."
#define dieusage() strerr_dieusage(100, USAGE)
int main (int argc, char const **argv, char const *const *envp)
{
int df = 0, w = 0 ;
PROG = "pipeline" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
register int opt = subgetopt_r(argc, argv, "drw", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'd' : df = 1 ; break ;
case 'r' : w = 0 ; break ;
case 'w' : w = 1 ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
}
{
pid_t pid ;
int fd ;
int argc1 = el_semicolon(argv) ;
if (argc1 >= argc) strerr_dief1x(100, "unterminated block") ;
if (argc1 + 1 == argc) strerr_dief1x(100, "empty remainder") ;
argv[argc1] = 0 ;
if (df)
{
int p[2] ;
if (pipe(p) < 0) strerr_diefu1sys(111, "create pipe") ;
pid = doublefork() ;
switch (pid)
{
case -1: strerr_diefu1sys(111, "doublefork") ;
case 0:
PROG = "pipeline (grandchild)" ;
fd_close(p[w]) ;
if (fd_move(!w, p[!w]) < 0) strerr_diefu1sys(111, "fd_move") ;
pathexec0_run(argv, envp) ;
strerr_dieexec(127, argv[0]) ;
}
fd_close(p[!w]) ;
fd = p[w] ;
}
else
{
pid = el_spawn1(argv[0], argv, envp, &fd, !w) ;
if (!pid) strerr_diefu2sys(111, "spawn ", argv[0]) ;
}
if (fd_move(w, fd) < 0) strerr_diefu1sys(111, "fd_move") ;
if (w == fd) uncoe(fd) ;
{
#ifdef EXECLINE_OLD_VARNAMES
char fmt[UINT64_FMT * 2 + 10] = "!=" ;
#else
char fmt[UINT64_FMT + 2] = "!=" ;
#endif
register unsigned int i = 2 ;
i += uint64_fmt(fmt+i, (uint64)pid) ; fmt[i++] = 0 ;
#ifdef EXECLINE_OLD_VARNAMES
byte_copy(fmt+i, 8, "LASTPID=") ; i += 8 ;
i += uint64_fmt(fmt+i, (uint64)pid) ; fmt[i++] = 0 ;
#endif
pathexec_r(argv + argc1 + 1, envp, env_len(envp), fmt, i) ;
}
strerr_dieexec(111, argv[argc1 + 1]) ;
}
}
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