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libc: add posix_spawnattr_{get,set}execfd_np(3)

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If execfd is set, the fexecve(2) is used by posix_spawn() instead of the
provided path.

Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D54862
This commit is contained in:
Konstantin Belousov
2026-01-25 00:06:36 +02:00
parent d185e9fae9
commit 3f0aea0968
3 changed files with 33 additions and 1 deletions
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include/spawn.h
+7
View File
@@ -123,6 +123,13 @@ int posix_spawnattr_setsigdefault(posix_spawnattr_t * __restrict,
const sigset_t * __restrict); const sigset_t * __restrict);
int posix_spawnattr_setsigmask(posix_spawnattr_t * __restrict, int posix_spawnattr_setsigmask(posix_spawnattr_t * __restrict,
const sigset_t * __restrict); const sigset_t * __restrict);
#if __BSD_VISIBLE
int posix_spawnattr_setexecfd_np(posix_spawnattr_t * __restrict, int);
int posix_spawnattr_getexecfd_np(const posix_spawnattr_t * __restrict,
int * __restrict);
#endif
__END_DECLS __END_DECLS
#endif /* !_SPAWN_H_ */ #endif /* !_SPAWN_H_ */
lib/libc/gen/Symbol.map
+5
View File
@@ -474,6 +474,11 @@ FBSD_1.8 {
str2sig; str2sig;
}; };
FBSD_1.9 {
posix_spawnattr_getexecfd_np;
posix_spawnattr_setexecfd_np;
};
FBSDprivate_1.0 { FBSDprivate_1.0 {
/* needed by thread libraries */ /* needed by thread libraries */
__thr_jtable; __thr_jtable;
lib/libc/gen/posix_spawn.c
+21 -1
View File
@@ -50,6 +50,7 @@ struct __posix_spawnattr {
int sa_schedpolicy; int sa_schedpolicy;
sigset_t sa_sigdefault; sigset_t sa_sigdefault;
sigset_t sa_sigmask; sigset_t sa_sigmask;
int sa_execfd;
}; };
struct __posix_spawn_file_actions { struct __posix_spawn_file_actions {
@@ -260,7 +261,9 @@ _posix_spawn_thr(void *data)
_exit(127); _exit(127);
} }
envp = psa->envp != NULL ? psa->envp : environ; envp = psa->envp != NULL ? psa->envp : environ;
if (psa->use_env_path) if (psa->sa != NULL && (*(psa->sa))->sa_execfd != -1)
fexecve((*(psa->sa))->sa_execfd, psa->argv, envp);
else if (psa->use_env_path)
__libc_execvpe(psa->path, psa->argv, envp); __libc_execvpe(psa->path, psa->argv, envp);
else else
_execve(psa->path, psa->argv, envp); _execve(psa->path, psa->argv, envp);
@@ -578,6 +581,7 @@ posix_spawnattr_init(posix_spawnattr_t *ret)
sa = calloc(1, sizeof(struct __posix_spawnattr)); sa = calloc(1, sizeof(struct __posix_spawnattr));
if (sa == NULL) if (sa == NULL)
return (errno); return (errno);
sa->sa_execfd = -1;
/* Set defaults as specified by POSIX, cleared above */ /* Set defaults as specified by POSIX, cleared above */
*ret = sa; *ret = sa;
@@ -639,6 +643,14 @@ posix_spawnattr_getsigmask(const posix_spawnattr_t * __restrict sa,
return (0); return (0);
} }
int
posix_spawnattr_getexecfd_np(const posix_spawnattr_t * __restrict sa,
int * __restrict fdp)
{
*fdp = (*sa)->sa_execfd;
return (0);
}
int int
posix_spawnattr_setflags(posix_spawnattr_t *sa, short flags) posix_spawnattr_setflags(posix_spawnattr_t *sa, short flags)
{ {
@@ -688,3 +700,11 @@ posix_spawnattr_setsigmask(posix_spawnattr_t * __restrict sa,
(*sa)->sa_sigmask = *sigmask; (*sa)->sa_sigmask = *sigmask;
return (0); return (0);
} }
int
posix_spawnattr_setexecfd_np(posix_spawnattr_t * __restrict sa,
int execfd)
{
(*sa)->sa_execfd = execfd;
return (0);
}