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/* ISC license. */
#include <skalibs/sysdeps.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <skalibs/djbunix.h>
#ifdef SKALIBS_HASPOSIXSPAWN
#include <spawn.h>
#include <stdlib.h>
#include <skalibs/config.h>
#include <skalibs/env.h>
pid_t child_spawn1 (char const *prog, char const *const *argv, char const *const *envp, int *fd, int to)
{
posix_spawn_file_actions_t actions ;
int e ;
int p[2] ;
pid_t pid ;
int haspath = !!env_get("PATH") ;
if (pipe(p) < 0) return 0 ;
to = !!to ;
e = posix_spawn_file_actions_init(&actions) ;
if (e) goto err ;
e = posix_spawn_file_actions_addclose(&actions, p[!to]) ;
if (e) goto erractions ;
e = posix_spawn_file_actions_adddup2(&actions, p[to], to) ;
if (e) goto erractions ;
if (!haspath && (setenv("PATH", SKALIBS_DEFAULTPATH, 0) < 0)) { e = errno ; goto erractions ; }
e = posix_spawnp(&pid, prog, &actions, 0, (char *const *)argv, (char *const *)envp) ;
if (!haspath) unsetenv("PATH") ;
posix_spawn_file_actions_destroy(&actions) ;
fd_close(p[to]) ;
if (e) goto errp ;
*fd = p[!to] ;
return pid ;
erractions:
posix_spawn_file_actions_destroy(&actions) ;
err:
fd_close(p[to]) ;
errp:
fd_close(p[!to]) ;
errno = e ;
return 0 ;
}
#else
#include <skalibs/allreadwrite.h>
pid_t child_spawn1 (char const *prog, char const *const *argv, char const *const *envp, int *fd, int to)
{
int e ;
int syncp[2] ;
int p[2] ;
pid_t pid ;
if (pipe(p) < 0) return 0 ;
if (pipecoe(syncp) < 0)
{
e = errno ;
fd_close(p[1]) ;
fd_close(p[0]) ;
errno = e ;
return 0 ;
}
to = !!to ;
pid = fork() ;
if (pid < 0)
{
e = errno ;
fd_close(syncp[1]) ;
fd_close(syncp[0]) ;
fd_close(p[1]) ;
fd_close(p[0]) ;
errno = e ;
return 0 ;
}
if (pid)
{
fd_close(syncp[0]) ;
fd_close(p[!to]) ;
if (fd_move(to, p[to]) < 0) goto err ;
pathexec_run(prog, argv, envp) ;
err:
e = errno ;
fd_write(syncp[1], (char *)&e, sizeof(e)) ;
_exit(127) ;
}
fd_close(syncp[1]) ;
fd_close(p[to]) ;
syncp[1] = fd_read(syncp[0], (char *)&e, sizeof(e)) ;
if (syncp[1] < 0)
{
e = errno ;
fd_close(syncp[0]) ;
fd_close(p[!to]) ;
errno = e ;
return 0 ;
}
fd_close(syncp[0]) ;
if (syncp[1] == sizeof(e))
{
fd_close(p[!to]) ;
wait_pid(pid, &syncp[1]) ;
errno = e ;
return 0 ;
}
*fd = p[!to] ;
return pid ;
}
#endif
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