The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=c1be185e3fb9afd6743683a8f5a43b9c364ab529
commit c1be185e3fb9afd6743683a8f5a43b9c364ab529 Author: Konstantin Belousov <[email protected]> AuthorDate: 2026-01-26 16:04:08 +0000 Commit: Konstantin Belousov <[email protected]> CommitDate: 2026-01-28 02:26:52 +0000 libsys, libc: provide rfork_thread() and pdrfork_thread() on all arches Reviewed by: markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D54898 --- lib/libsys/Symbol.sys.map | 2 ++ lib/libsys/aarch64/Makefile.sys | 2 ++ lib/libsys/amd64/Symbol.sys.map | 5 ----- lib/libsys/arm/Makefile.sys | 2 ++ lib/libsys/i386/Symbol.sys.map | 5 ----- lib/libsys/pdrfork_thread_gen.c | 34 +++++++++++++++++++++++++++++++++ lib/libsys/powerpc/Makefile.sys | 2 ++ lib/libsys/powerpc64/Makefile.sys | 2 ++ lib/libsys/rfork_thread_gen.c | 40 +++++++++++++++++++++++++++++++++++++++ lib/libsys/riscv/Makefile.sys | 2 ++ 10 files changed, 86 insertions(+), 10 deletions(-) diff --git a/lib/libsys/Symbol.sys.map b/lib/libsys/Symbol.sys.map index 63446888c8d4..46767f5b6a4d 100644 --- a/lib/libsys/Symbol.sys.map +++ b/lib/libsys/Symbol.sys.map @@ -182,6 +182,7 @@ FBSD_1.0 { rename; revoke; rfork; + rfork_thread; rmdir; rtprio; rtprio_thread; @@ -391,6 +392,7 @@ FBSD_1.8 { FBSD_1.9 { pdrfork; + pdrfork_thread; }; FBSDprivate_1.0 { diff --git a/lib/libsys/aarch64/Makefile.sys b/lib/libsys/aarch64/Makefile.sys index 04b95602c580..c7aaf52d535a 100644 --- a/lib/libsys/aarch64/Makefile.sys +++ b/lib/libsys/aarch64/Makefile.sys @@ -1,6 +1,8 @@ MIASM:= ${MIASM:Nfreebsd[467]_*} SRCS+= __vdso_gettc.c \ + pdrfork_thread_gen.c \ + rfork_thread_gen.c \ sched_getcpu_gen.c MDASM= cerror.S \ diff --git a/lib/libsys/amd64/Symbol.sys.map b/lib/libsys/amd64/Symbol.sys.map index b037e12d45f5..67a8df7d2a8c 100644 --- a/lib/libsys/amd64/Symbol.sys.map +++ b/lib/libsys/amd64/Symbol.sys.map @@ -1,5 +1,4 @@ FBSD_1.0 { - rfork_thread; amd64_get_fsbase; amd64_get_gsbase; amd64_set_fsbase; @@ -17,10 +16,6 @@ FBSD_1.8 { amd64_set_tlsbase; }; -FBSD_1.9 { - pdrfork_thread; -}; - FBSDprivate_1.0 { _vfork; }; diff --git a/lib/libsys/arm/Makefile.sys b/lib/libsys/arm/Makefile.sys index 27d78978a2f4..424d2f9cc9d8 100644 --- a/lib/libsys/arm/Makefile.sys +++ b/lib/libsys/arm/Makefile.sys @@ -1,4 +1,6 @@ SRCS+= __vdso_gettc.c \ + pdrfork_thread_gen.c \ + rfork_thread_gen.c \ sched_getcpu_gen.c MDASM= \ diff --git a/lib/libsys/i386/Symbol.sys.map b/lib/libsys/i386/Symbol.sys.map index a35349e4953b..03a28f9e486c 100644 --- a/lib/libsys/i386/Symbol.sys.map +++ b/lib/libsys/i386/Symbol.sys.map @@ -10,7 +10,6 @@ FBSD_1.0 { i386_set_ldt; i386_set_watch; i386_vm86; - rfork_thread; }; FBSD_1.6 { @@ -20,10 +19,6 @@ FBSD_1.6 { x86_pkru_unprotect_range; }; -FBSD_1.9 { - pdrfork_thread; -}; - FBSDprivate_1.0 { _vfork; }; diff --git a/lib/libsys/pdrfork_thread_gen.c b/lib/libsys/pdrfork_thread_gen.c new file mode 100644 index 000000000000..d36b2cc11993 --- /dev/null +++ b/lib/libsys/pdrfork_thread_gen.c @@ -0,0 +1,34 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright 2026 The FreeBSD Foundation + * + * This software were developed by + * Konstantin Belousov <[email protected]> under sponsorship from + * the FreeBSD Foundation. + */ + +#include <sys/types.h> +#include <sys/procdesc.h> +#include <errno.h> +#include <unistd.h> + +pid_t +pdrfork_thread(int *fdp, int pdflags, int rfflags, void *stack_addr, + int (*start_fn)(void *), void *arg) +{ + pid_t res; + int ret; + + /* See comment in rfork_thread_gen.c. */ + if (stack_addr != NULL) { + errno = EOPNOTSUPP; + return (-1); + } + res = pdrfork(fdp, pdflags, rfflags); + if (res == 0) { + ret = start_fn(arg); + _exit(ret); + } + return (res); +} diff --git a/lib/libsys/powerpc/Makefile.sys b/lib/libsys/powerpc/Makefile.sys index 9979d5179f51..f066aae1a4fa 100644 --- a/lib/libsys/powerpc/Makefile.sys +++ b/lib/libsys/powerpc/Makefile.sys @@ -1,4 +1,6 @@ SRCS+= __vdso_gettc.c \ + pdrfork_thread_gen.c \ + rfork_thread_gen.c \ sched_getcpu_gen.c MDASM+= cerror.S diff --git a/lib/libsys/powerpc64/Makefile.sys b/lib/libsys/powerpc64/Makefile.sys index 9979d5179f51..f066aae1a4fa 100644 --- a/lib/libsys/powerpc64/Makefile.sys +++ b/lib/libsys/powerpc64/Makefile.sys @@ -1,4 +1,6 @@ SRCS+= __vdso_gettc.c \ + pdrfork_thread_gen.c \ + rfork_thread_gen.c \ sched_getcpu_gen.c MDASM+= cerror.S diff --git a/lib/libsys/rfork_thread_gen.c b/lib/libsys/rfork_thread_gen.c new file mode 100644 index 000000000000..5a8f6e3f650f --- /dev/null +++ b/lib/libsys/rfork_thread_gen.c @@ -0,0 +1,40 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright 2026 The FreeBSD Foundation + * + * This software were developed by + * Konstantin Belousov <[email protected]> under sponsorship from + * the FreeBSD Foundation. + */ + +#include <errno.h> +#include <unistd.h> + +pid_t +rfork_thread(int flags, void *stack_addr, int (*start_fn)(void *), void *arg) +{ + pid_t res; + int ret; + + /* + * Generic implementation cannot switch stacks. Only + * architecture-specific code knows how to do it. Require + * that caller knows that, and refuse to do operate if the + * stack was supplied. + * + * Note that implementations that do switch stack, would fault + * immediately if the passed stack is NULL. They do not need to + * specifically check for the NULL stack value. + */ + if (stack_addr != NULL) { + errno = EOPNOTSUPP; + return (-1); + } + res = rfork(flags); + if (res == 0) { + ret = start_fn(arg); + _exit(ret); + } + return (res); +} diff --git a/lib/libsys/riscv/Makefile.sys b/lib/libsys/riscv/Makefile.sys index 2ff84735f484..87181565f0be 100644 --- a/lib/libsys/riscv/Makefile.sys +++ b/lib/libsys/riscv/Makefile.sys @@ -1,4 +1,6 @@ SRCS+= __vdso_gettc.c \ + pdrfork_thread_gen.c \ + rfork_thread_gen.c \ sched_getcpu_gen.c MDASM= cerror.S \
