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/* ISC license. */
/* MT-unsafe */
#include <skalibs/sysdeps.h>
#include <unistd.h>
#include <errno.h>
#include <skalibs/djbunix.h>
#ifdef SKALIBS_HASPOSIXSPAWN
#include <signal.h>
#include <stdlib.h>
#include <spawn.h>
#include <skalibs/config.h>
pid_t child_spawn2 (char const *prog, char const *const *argv, char const *const *envp, int *fds)
{
pid_t pid ;
posix_spawn_file_actions_t actions ;
posix_spawnattr_t attr ;
int p[2][2] ;
int e ;
int nopath = !getenv("PATH") ;
sigset_t set ;
#ifdef SKALIBS_HASPOSIXSPAWNEARLYRETURN
int syncpipe[2] ;
if (pipecoe(syncpipe) == -1) return 0 ;
#endif
if (pipe(p[0]) == -1) goto err ;
if (ndelay_on(p[0][0]) == -1 || coe(p[0][0]) == -1 || pipe(p[1]) == -1) goto errp ;
if (ndelay_on(p[1][1]) == -1 || coe(p[1][1]) == -1) goto errp1 ;
e = posix_spawnattr_init(&attr) ;
if (e) goto erre ;
sigemptyset(&set) ;
e = posix_spawnattr_setsigmask(&attr, &set) ;
if (e) goto errattr ;
e = posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETSIGMASK) ;
if (e) goto errattr ;
e = posix_spawn_file_actions_init(&actions) ;
if (e) goto errattr ;
if (p[1][0] != fds[0])
{
e = posix_spawn_file_actions_adddup2(&actions, p[1][0], fds[0]) ;
if (e) goto erractions ;
e = posix_spawn_file_actions_addclose(&actions, p[1][0]) ;
if (e) goto erractions ;
}
if (p[0][1] != fds[1])
{
e = posix_spawn_file_actions_adddup2(&actions, p[0][1], fds[1]) ;
if (e) goto erractions ;
e = posix_spawn_file_actions_addclose(&actions, p[0][1]) ;
if (e) goto erractions ;
}
if (nopath && (setenv("PATH", SKALIBS_DEFAULTPATH, 0) == -1))
{
e = errno ; goto erractions ;
}
e = posix_spawnp(&pid, prog, &actions, &attr, (char *const *)argv, (char *const *)envp) ;
if (nopath) unsetenv("PATH") ;
if (e) goto erractions ;
posix_spawn_file_actions_destroy(&actions) ;
posix_spawnattr_destroy(&attr) ;
fd_close(p[0][1]) ;
fd_close(p[1][0]) ;
#ifdef SKALIBS_HASPOSIXSPAWNEARLYRETURN
pid = child_spawn_workaround(pid, syncpipe) ;
if (!pid)
{
fd_close(p[1][1]) ;
fd_close(p[0][0]) ;
return 0 ;
}
#endif
fds[0] = p[0][0] ;
fds[1] = p[1][1] ;
return pid ;
erractions:
posix_spawn_file_actions_destroy(&actions) ;
errattr:
posix_spawnattr_destroy(&attr) ;
erre:
errno = e ;
errp1:
fd_close(p[1][1]) ;
fd_close(p[1][0]) ;
errp:
fd_close(p[0][1]) ;
fd_close(p[0][0]) ;
err:
#ifdef SKALIBS_HASPOSIXSPAWNEARLYRETURN
fd_close(syncpipe[1]) ;
fd_close(syncpipe[0]) ;
#endif
return 0 ;
}
#else
#include <skalibs/allreadwrite.h>
#include <skalibs/sig.h>
#include <skalibs/exec.h>
pid_t child_spawn2 (char const *prog, char const *const *argv, char const *const *envp, int *fds)
{
pid_t pid ;
int syncpipe[2] ;
int p[2][2] ;
char c ;
if (pipe(p[0]) < 0) return 0 ;
if (ndelay_on(p[0][0]) < 0 || coe(p[0][0]) < 0 || pipe(p[1]) < 0) goto errp ;
if (ndelay_on(p[1][1]) < 0 || coe(p[1][1]) < 0) goto errp1 ;
if (pipecoe(syncpipe) < 0) goto errp1 ;
pid = fork() ;
if (pid == -1) goto errsp ;
else if (!pid)
{
if (fd_move2(fds[0], p[1][0], fds[1], p[0][1]) < 0) goto syncdie ;
sig_blocknone() ;
exec_ae(prog, argv, envp) ;
syncdie:
c = errno ;
fd_write(syncpipe[1], &c, 1) ;
_exit(127) ;
}
fd_close(syncpipe[1]) ;
syncpipe[1] = fd_read(syncpipe[0], &c, 1) ;
if (syncpipe[1])
{
int e = (unsigned char)c ;
if (syncpipe[1] == -1) e = errno ;
if (wait_pid(pid, &syncpipe[1]) == -1) e = errno ;
errno = e ;
goto errsp0 ;
}
fd_close(syncpipe[0]) ;
fd_close(p[0][1]) ;
fd_close(p[1][0]) ;
fds[0] = p[0][0] ;
fds[1] = p[1][1] ;
return pid ;
errsp:
fd_close(syncpipe[1]) ;
errsp0:
fd_close(syncpipe[0]) ;
errp1:
fd_close(p[1][1]) ;
fd_close(p[1][0]) ;
errp:
fd_close(p[0][1]) ;
fd_close(p[0][0]) ;
return 0 ;
}
#endif
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