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/* ISC license. */
#include <unistd.h>
#include <skalibs/types.h>
#include <skalibs/env.h>
#include <skalibs/djbunix.h>
#include <skalibs/cspawn.h>
pid_t child_spawn3 (char const *prog, char const *const *argv, char const *const *envp, int *fds)
{
pid_t pid ;
int p[3][2] ;
if (pipe(p[0]) == -1) return 0 ;
if (ndelay_on(p[0][0]) == -1 || coe(p[0][0]) == -1 || pipe(p[1]) == -1) goto errp0 ;
if (ndelay_on(p[1][1]) == -1 || coe(p[1][1]) == -1 || pipe(p[2]) == -1) goto errp1 ;
if (ndelay_on(p[2][0]) == -1 || coe(p[2][0]) == -1) goto err ;
{
cspawn_fileaction fa[2] =
{
[0] = { .type = CSPAWN_FA_MOVE, .x = { .fd2 = { [0] = fds[0], [1] = p[1][0] } } },
[1] = { .type = CSPAWN_FA_MOVE, .x = { .fd2 = { [0] = fds[1], [1] = p[0][1] } } }
} ;
size_t envlen = env_len(envp) ;
size_t m = sizeof(SKALIBS_CHILD_SPAWN_FDS_ENVVAR) ;
char modifs[sizeof(SKALIBS_CHILD_SPAWN_FDS_ENVVAR) + UINT_FMT] = SKALIBS_CHILD_SPAWN_FDS_ENVVAR "=" ;
char const *newenv[envlen + 2] ;
m += uint_fmt(modifs + sizeof(SKALIBS_CHILD_SPAWN_FDS_ENVVAR), p[2][1]) ;
modifs[m++] = 0 ;
env_mergen(newenv, envlen + 2, envp, envlen, modifs, m, 1) ;
pid = cspawn(prog, argv, newenv, CSPAWN_FLAGS_SIGBLOCKNONE, fa, 2) ;
if (!pid) goto err ;
}
fd_close(p[2][1]) ;
fd_close(p[1][0]) ;
fd_close(p[0][1]) ;
fds[0] = p[0][0] ;
fds[1] = p[1][1] ;
fds[2] = p[2][0] ;
return pid ;
err:
fd_close(p[2][1]) ;
fd_close(p[2][0]) ;
errp1:
fd_close(p[1][1]) ;
fd_close(p[1][0]) ;
errp0:
fd_close(p[0][1]) ;
fd_close(p[0][0]) ;
return 0 ;
}
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