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/* ISC license. */
#include <skalibs/sysdeps.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <skalibs/uint16.h>
#include <skalibs/fmtscan.h>
#include <skalibs/djbunix.h>
#include <s6/ucspiserver.h>
#ifdef SKALIBS_HASPOSIXSPAWN
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <spawn.h>
#include <skalibs/config.h>
#include <skalibs/env.h>
pid_t s6_ucspiserver_spawn (int fd, char const *const *argv, char const *const *envp, size_t envlen, char const *modifs, size_t modiflen, size_t modifn)
{
pid_t pid ;
posix_spawn_file_actions_t actions ;
posix_spawnattr_t attr ;
sigset_t set ;
int e ;
int nopath = !getenv("PATH") ;
#ifdef SKALIBS_HASPOSIXSPAWNEARLYRETURN
int p[2] ;
#endif
char const *newenvp[envlen + modifn + 1] ;
#ifdef SKALIBS_HASPOSIXSPAWNEARLYRETURN
if (pipecoe(p) == -1) return 0 ;
#endif
e = posix_spawnattr_init(&attr) ;
if (e) goto err ;
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 ;
e = posix_spawn_file_actions_adddup2(&actions, fd, 0) ;
if (e) goto erractions ;
e = posix_spawn_file_actions_adddup2(&actions, fd, 1) ;
if (e) goto erractions ;
if (fd > 1)
{
e = posix_spawn_file_actions_addclose(&actions, fd) ;
if (e) goto erractions ;
}
env_mergen(newenvp, envlen + modifn + 1, envp, envlen, modifs, modiflen, modifn) ;
if (nopath && (setenv("PATH", SKALIBS_DEFAULTPATH, 0) < 0)) { e = errno ; goto erractions ; }
e = posix_spawnp(&pid, argv[0], &actions, &attr, (char *const *)argv, (char *const *)newenvp) ;
if (nopath) unsetenv("PATH") ;
if (e) goto erractions ;
posix_spawn_file_actions_destroy(&actions) ;
posix_spawnattr_destroy(&attr) ;
#ifdef SKALIBS_HASPOSIXSPAWNEARLYRETURN
return child_spawn_workaround(pid, p) ;
#else
return pid ;
#endif
erractions:
posix_spawn_file_actions_destroy(&actions) ;
errattr:
posix_spawnattr_destroy(&attr) ;
err:
#ifdef SKALIBS_HASPOSIXSPAWNEARLYRETURN
fd_close(p[1]) ;
fd_close(p[0]) ;
#endif
errno = e ;
return 0 ;
}
#else
#include <skalibs/strerr.h>
#include <skalibs/selfpipe.h>
#include <skalibs/exec.h>
pid_t s6_ucspiserver_spawn (int fd, char const *const *argv, char const *const *envp, size_t envlen, char const *modifs, size_t modiflen, size_t modifn)
{
pid_t pid = fork() ;
if (pid == -1) return 0 ;
if (!pid)
{
size_t proglen = strlen(PROG) ;
char newprog[proglen + 9] ;
memcpy(newprog, PROG, proglen) ;
memcpy(newprog, " (child)", 9) ;
PROG = newprog ;
if ((fd_move(1, fd) == -1) || (fd_copy(0, 1) == -1))
strerr_diefu1sys(111, "move fds") ;
selfpipe_finish() ;
xmexec_fn(argv, envp, envlen, modifs, modiflen, modifn) ;
}
return pid ;
}
#endif
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