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libc: POSIX threads, semaphores, regex, glob, nftw, syslog #167

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Merged
teo1747 merged 15 commits into from
Oct 30, 2026
Merged

libc: POSIX threads, semaphores, regex, glob, nftw, syslog #167

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31a4f48
driver: the C library's headers before the compiler's, and each direc…
teo1747 Oct 29, 2026
f546bb1
libc: POSIX's strings, environment, generators and small modules
teo1747 Oct 29, 2026
6278d39
libc: POSIX's stdio -- memory streams, getline, fdopen, nesting locks
teo1747 Oct 29, 2026
e54cf5d
link: an executable is written executable
teo1747 Oct 30, 2026
dc43ecc
libc: POSIX's operating system -- the contract, Linux, and the calls
teo1747 Oct 30, 2026
a15fec4
libc: EmbLinkOS's backend, all of POSIX this kernel has
teo1747 Oct 30, 2026
d87aeff
libc: local time from TZ, strptime, and spawn handles a backend can r…
teo1747 Oct 30, 2026
8f2318c
libc: EmbLinkOS's whole userland on it, and C++ there by EmbCC
teo1747 Oct 30, 2026
4f26a46
libc: <limits.h> with newlib's ahead of it, and posix-process on a board
teo1747 Oct 30, 2026
604db0f
libc: the names a backend is built on, defined only where a kernel is
teo1747 Oct 30, 2026
4398155
libc: POSIX threads, semaphores, and C11's threads on the same core
teo1747 Oct 30, 2026
8ef989f
libc: regex, glob, nftw, syslog, nl_langinfo
teo1747 Oct 30, 2026
ae0c23a
driver: -lpthread, -ldl, -lrt and -lutil are the C library's
teo1747 Oct 30, 2026
098fbc2
libc: fork reaches pthread_atfork's handlers through a hook, not a we…
teo1747 Oct 30, 2026
2f9f9ee
tests: libc-emblinkos's archive has os/posix-names.c, as the Makefile…
teo1747 Oct 30, 2026
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62 changes: 52 additions & 10 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -849,21 +849,61 @@ rt-darwin-x86_64: embcc embar
# EmbLinkOS is a backend, not a second library: same sources, one different
# file at the bottom. It needs that OS's ABI headers, so it is opt-in.
# make libc-emblinkos EMBLINKOS=$HOME/EmbLinkOs
# make libc-emblinkos EMBLINKOS=... EMBLINKOS_ARCH=aarch64
# x86_64's goes to build/libc/emblinkos, aarch64's to emblinkos-aarch64.
EMBLINKOS ?= $(HOME)/EmbLinkOs
EMBLINKOS_ARCH ?= x86_64
ELOS_SUFFIX = $(if $(filter aarch64,$(EMBLINKOS_ARCH)),-aarch64,)
ELOS_LIBC = $(BUILD)/libc/emblinkos$(ELOS_SUFFIX)
ELOS_LIBCXX = $(BUILD)/libcxx/emblinkos$(ELOS_SUFFIX)
# --unwind-tables: every function gets its .eh_frame, as GCC gives every
# x86-64 function by default. The unwinder needs its own frames' (without
# them a throw's walk ends where it starts, in _Unwind_RaiseException), and a
# throw from a C++ callback passes through C frames -- qsort's, bsearch's.
ELOS_CC = ./embcc --target=$(EMBLINKOS_ARCH)-elf --unwind-tables

libc-emblinkos: embcc embar
@[ -f "$(EMBLINKOS)/user/lib/embk.h" ] || { \
echo "libc-emblinkos: no $(EMBLINKOS)/user/lib/embk.h"; \
echo " set EMBLINKOS=/path/to/EmbLinkOs"; exit 1; }
@mkdir -p $(BUILD)/libc/emblinkos
@for f in $(LIBC_SRCS_PORTABLE) lib/libc/os/emblinkos/backend.c; do \
o=$(BUILD)/libc/emblinkos/$$(echo $$f | tr / _ | sed 's/\.c$$/.o/'); \
./embcc -c -O2 $(LIBC_INC) -I$(EMBLINKOS)/user/lib $$f -o $$o || exit 1; \
@case "$(EMBLINKOS_ARCH)" in x86_64|aarch64) ;; *) \
echo "libc-emblinkos: EMBLINKOS_ARCH is x86_64 or aarch64"; exit 1;; esac
@mkdir -p $(ELOS_LIBC)
@for f in $(LIBC_SRCS_PORTABLE) lib/libc/os/posix-names.c \
lib/libc/os/emblinkos/backend.c; do \
o=$(ELOS_LIBC)/$$(echo $$f | tr / _ | sed 's/\.c$$/.o/'); \
$(ELOS_CC) -c -O2 $(LIBC_INC) -I$(EMBLINKOS)/user/lib $$f -o $$o || exit 1; \
done
@rm -f $(BUILD)/libc/emblinkos/libc.a
@$${EMBCC_X86_AR:-./embar} rcs $(BUILD)/libc/emblinkos/libc.a \
$(BUILD)/libc/emblinkos/*.o
@echo "libc: $(BUILD)/libc/emblinkos/libc.a"
@rm -f $(ELOS_LIBC)/libc.a $(ELOS_LIBC)/libm.a
@$${EMBCC_X86_AR:-./embar} rcs $(ELOS_LIBC)/libc.a $(ELOS_LIBC)/*.o
@# libm.a holds nothing: the math is in libc.a, as glibc's is, and an
@# empty one beside it keeps a program's -lm from finding another libc's
@printf '' > $(ELOS_LIBC)/libm-empty.c
@$(ELOS_CC) -c $(ELOS_LIBC)/libm-empty.c -o $(ELOS_LIBC)/libm-empty.o.x
@$${EMBCC_X86_AR:-./embar} rcs $(ELOS_LIBC)/libm.a $(ELOS_LIBC)/libm-empty.o.x
@# librt.a: the compiler runtime, with the unwinder C++'s exceptions
@# need -- its programs have no other (lib/rt/unwind.c says why)
@for f in $(RT_SRCS); do \
o=$(ELOS_LIBC)/rt_$$(basename $$f .c).o.x; \
$(ELOS_CC) -c -O2 -D__EMBCC_RT_UNWIND $$f -o $$o || exit 1; \
done
@rm -f $(ELOS_LIBC)/librt.a
@$${EMBCC_X86_AR:-./embar} rcs $(ELOS_LIBC)/librt.a $(ELOS_LIBC)/rt_*.o.x
@echo "libc: $(ELOS_LIBC)/libc.a (+ an empty libm.a, and librt.a)"

# C++ on EmbLinkOS: lib/libcxx over this C library, compiled by EmbCC.
# make libcxx-emblinkos EMBLINKOS=$HOME/EmbLinkOs [EMBLINKOS_ARCH=aarch64]
libcxx-emblinkos: embcc embar
@[ -f "$(EMBLINKOS)/user/lib/embk.h" ] || { \
echo "libcxx-emblinkos: no $(EMBLINKOS)/user/lib/embk.h"; exit 1; }
@mkdir -p $(ELOS_LIBCXX)
@for f in $(LIBCXX_SRCS); do \
o=$(ELOS_LIBCXX)/$$(basename $$f .cc).o; \
$(ELOS_CC) -c -O2 -x c++ $(LIBCXX_INC) -I$(EMBLINKOS)/user/lib $$f -o $$o || exit 1; \
done
@rm -f $(ELOS_LIBCXX)/libcxx.a
@$${EMBCC_X86_AR:-./embar} rcs $(ELOS_LIBCXX)/libcxx.a $(ELOS_LIBCXX)/*.o
@echo "libcxx: $(ELOS_LIBCXX)/libcxx.a"

# Linux, which is the first target this library reaches with NO other C
# library underneath it: lib/libc/os/linux/backend.c issues syscalls, so
Expand All @@ -875,7 +915,9 @@ libc-emblinkos: embcc embar
# exactly once in an image, and a definition that arrives by archive
# member is a definition that arrives by accident.
# make libc-linux-x86_64 / make libc-linux-aarch64
LIBC_SRCS_LINUX := $(LIBC_SRCS_PORTABLE) lib/libc/os/linux/backend.c \
LIBC_SRCS_LINUX := $(LIBC_SRCS_PORTABLE) lib/libc/os/posix-names.c \
lib/libc/os/linux/backend.c \
lib/libc/os/linux/posix.c \
lib/libc/os/linux/thread.c lib/libc/os/linux/tls.c

# lib/rt -- the COMPILER runtime, which is a different library from the C
Expand Down Expand Up @@ -1230,7 +1272,7 @@ distclean: clean
rm -f config.mk

.PHONY: all check test test-arm64 test-libstdcxx site libc libc-x86_64 libc-aarch64 \
libc-emblinkos libc-linux libc-linux-x86_64 libc-linux-aarch64 \
libc-emblinkos libcxx-emblinkos libc-linux libc-linux-x86_64 libc-linux-aarch64 \
libcxx libcxx-x86_64 libcxx-aarch64 \
libcxx-linux-x86_64 libcxx-linux-aarch64 libcxx-embedded \
install install-files uninstall libc-linux-all clean distclean
2 changes: 1 addition & 1 deletion build.ebm
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Expand Up @@ -13,7 +13,7 @@ output: /data/build/out/embcc/platform_platform_common.o

name: platform_platform_posix.o
kind: compile
inputs: /data/src/embcc/platform/platform_posix.c /data/src/embcc/platform/platform.h /data/apps/embcc/include/stddef.h /system/abi/include/stdio.h /system/abi/include/_ansi.h /system/abi/include/newlib.h /system/abi/include/_newlib_version.h /system/abi/include/sys/config.h /system/abi/include/machine/ieeefp.h /system/abi/include/sys/features.h /system/abi/include/sys/cdefs.h /system/abi/include/machine/_default_types.h /data/apps/embcc/include/stdarg.h /system/abi/include/sys/reent.h /system/abi/include/sys/_types.h /system/abi/include/machine/_types.h /system/abi/include/sys/lock.h /system/abi/include/sys/stdio.h /system/abi/include/stdlib.h /system/abi/include/machine/stdlib.h /system/abi/include/alloca.h /data/apps/embcc/include/string.h /data/src/embcc/driver/util.h /system/abi/include/dirent.h /system/abi/include/sys/dirent.h /system/abi/include/unistd.h /system/abi/include/sys/unistd.h /system/abi/include/sys/types.h /system/abi/include/sys/_stdint.h /system/abi/include/sys/_pthreadtypes.h /system/abi/include/sys/sched.h /system/abi/include/sys/_timespec.h /system/abi/include/machine/types.h /system/abi/include/pthread.h
inputs: /data/src/embcc/platform/platform_posix.c /data/src/embcc/platform/platform.h /data/apps/embcc/include/stddef.h /system/abi/include/stdio.h /system/abi/include/_ansi.h /system/abi/include/newlib.h /system/abi/include/_newlib_version.h /system/abi/include/sys/config.h /system/abi/include/machine/ieeefp.h /system/abi/include/sys/features.h /system/abi/include/sys/cdefs.h /system/abi/include/machine/_default_types.h /data/apps/embcc/include/stdarg.h /system/abi/include/sys/reent.h /system/abi/include/sys/_types.h /system/abi/include/machine/_types.h /system/abi/include/sys/lock.h /system/abi/include/sys/stdio.h /system/abi/include/stdlib.h /system/abi/include/machine/stdlib.h /system/abi/include/alloca.h /data/apps/embcc/include/string.h /data/src/embcc/driver/util.h /system/abi/include/dirent.h /system/abi/include/sys/dirent.h /system/abi/include/unistd.h /system/abi/include/sys/unistd.h /system/abi/include/sys/types.h /system/abi/include/sys/_stdint.h /system/abi/include/sys/_pthreadtypes.h /system/abi/include/sys/sched.h /system/abi/include/sys/_timespec.h /system/abi/include/machine/types.h /system/abi/include/sys/stat.h /system/abi/include/time.h /system/abi/include/machine/time.h /system/abi/include/sys/timespec.h /system/abi/include/sys/_locale.h /system/abi/include/pthread.h
args: /data/apps/embcc/embcc.elf -c -I/data/apps/embcc/include -I/system/abi/include /data/src/embcc/platform/platform_posix.c -o /data/build/out/embcc/platform_platform_posix.o
output: /data/build/out/embcc/platform_platform_posix.o

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