From 43c1802f880471c5b69f8c622314827790aad0b8 Mon Sep 17 00:00:00 2001 From: Miquel Sabaté Solà Date: Fri, 26 Sep 2025 23:04:36 +0200 Subject: Initial commit MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Miquel Sabaté Solà --- .clang-format | 109 ++++++++ .editorconfig | 8 + .gitignore | 7 + LICENSE | 674 ++++++++++++++++++++++++++++++++++++++++++++++++ Makefile | 113 ++++++++ README.md | 121 +++++++++ include/pudc/compiler.h | 22 ++ include/pudc/print.h | 66 +++++ include/pudc/pudc.h | 32 +++ src/main.c | 91 +++++++ src/print.c | 94 +++++++ 11 files changed, 1337 insertions(+) create mode 100644 .clang-format create mode 100644 .editorconfig create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 Makefile create mode 100644 README.md create mode 100644 include/pudc/compiler.h create mode 100644 include/pudc/print.h create mode 100644 include/pudc/pudc.h create mode 100644 src/main.c create mode 100644 src/print.c diff --git a/.clang-format b/.clang-format new file mode 100644 index 0000000..d21d53a --- /dev/null +++ b/.clang-format @@ -0,0 +1,109 @@ +# Modified from the Linux Kernel. +--- +AccessModifierOffset: -4 +AlignAfterOpenBracket: Align +AlignConsecutiveAssignments: false +AlignConsecutiveDeclarations: false +AlignEscapedNewlines: Left +AlignOperands: true +AlignTrailingComments: false +AllowAllParametersOfDeclarationOnNextLine: false +AllowShortBlocksOnASingleLine: false +AllowShortCaseLabelsOnASingleLine: false +AllowShortFunctionsOnASingleLine: None +AllowShortIfStatementsOnASingleLine: false +AllowShortLoopsOnASingleLine: false +AlwaysBreakAfterDefinitionReturnType: None +AlwaysBreakAfterReturnType: None +AlwaysBreakBeforeMultilineStrings: false +AlwaysBreakTemplateDeclarations: false +BinPackArguments: true +BinPackParameters: true +BraceWrapping: + AfterClass: false + AfterControlStatement: false + AfterEnum: false + AfterFunction: true + AfterNamespace: true + AfterObjCDeclaration: false + AfterStruct: false + AfterUnion: false + AfterExternBlock: false + BeforeCatch: false + BeforeElse: false + IndentBraces: false + SplitEmptyFunction: true + SplitEmptyRecord: true + SplitEmptyNamespace: true +BreakBeforeBinaryOperators: None +BreakBeforeBraces: Custom +BreakBeforeInheritanceComma: false +BreakBeforeTernaryOperators: false +BreakConstructorInitializersBeforeComma: false +BreakConstructorInitializers: BeforeComma +BreakAfterJavaFieldAnnotations: false +BreakStringLiterals: false +ColumnLimit: 100 +CommentPragmas: '^ IWYU pragma:' +CompactNamespaces: false +ConstructorInitializerAllOnOneLineOrOnePerLine: false +ConstructorInitializerIndentWidth: 4 +ContinuationIndentWidth: 4 +Cpp11BracedListStyle: false +DerivePointerAlignment: false +DisableFormat: false +ExperimentalAutoDetectBinPacking: false +FixNamespaceComments: false + +IncludeBlocks: Preserve +IncludeCategories: + - Regex: '.*' + Priority: 1 +IncludeIsMainRegex: '(Test)?$' +IndentCaseLabels: false +IndentGotoLabels: false +IndentPPDirectives: None +IndentWidth: 4 +IndentWrappedFunctionNames: false +JavaScriptQuotes: Leave +JavaScriptWrapImports: true +KeepEmptyLinesAtTheStartOfBlocks: false +MacroBlockBegin: '' +MacroBlockEnd: '' +MaxEmptyLinesToKeep: 1 +NamespaceIndentation: None +ObjCBinPackProtocolList: Auto +ObjCBlockIndentWidth: 4 +ObjCSpaceAfterProperty: true +ObjCSpaceBeforeProtocolList: true + +PenaltyBreakAssignment: 10 +PenaltyBreakBeforeFirstCallParameter: 30 +PenaltyBreakComment: 10 +PenaltyBreakFirstLessLess: 0 +PenaltyBreakString: 10 +PenaltyExcessCharacter: 100 +PenaltyReturnTypeOnItsOwnLine: 60 + +PointerAlignment: Right +ReflowComments: false +SortIncludes: false +SortUsingDeclarations: false +SpaceAfterCStyleCast: false +SpaceAfterTemplateKeyword: true +SpaceBeforeAssignmentOperators: true +SpaceBeforeCtorInitializerColon: true +SpaceBeforeInheritanceColon: true +SpaceBeforeParens: ControlStatementsExceptForEachMacros +SpaceBeforeRangeBasedForLoopColon: true +SpaceInEmptyParentheses: false +SpacesBeforeTrailingComments: 1 +SpacesInAngles: false +SpacesInContainerLiterals: false +SpacesInCStyleCastParentheses: false +SpacesInParentheses: false +SpacesInSquareBrackets: false +Standard: Latest +TabWidth: 4 +UseTab: Always +... diff --git a/.editorconfig b/.editorconfig new file mode 100644 index 0000000..e7bd01a --- /dev/null +++ b/.editorconfig @@ -0,0 +1,8 @@ +root = true + +[{*.{c,h,s,S},Makefile,Makefile.*}] +charset = utf-8 +end_of_line = lf +insert_final_newline = true +indent_style = tab +indent_size = 4 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..69f7343 --- /dev/null +++ b/.gitignore @@ -0,0 +1,7 @@ +*.o +init +.cache +disk.img + +# You can generate it with Bear: `$ bear -- make`. +compile_commands.json \ No newline at end of file diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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Limitation of Liability. + + IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS +THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY +GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE +USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF +DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD +PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), +EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF +SUCH DAMAGES. + + 17. Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..387810e --- /dev/null +++ b/Makefile @@ -0,0 +1,113 @@ +## +# By default everything is silent. If you want to change this behavior, simply +# assign V=1 when calling make. + +V = +ifeq ($(strip $(V)),) + E = @echo + Q = @ +else + E = @\# + Q = +endif + +## +# Paths. + +SRC = $(wildcard src/*.S src/*.c) +OBJ = $(patsubst %.c,%.o,$(patsubst %.S,%.o,$(SRC))) +EXE = init +ARCH = riscv +LINUX_SOURCE ?= +KERNEL = $(LINUX_SOURCE)/arch/$(ARCH)/boot/Image + +## +# Compile options. You can use CROSS_COMPILE just like on the Linux Kernel. You +# can also determine the ISA to be used, which defaults to my VisionFive2 board. +# I did not go too much into the rabbit hole of platform-specific flags because +# everything is in assembly anyways and everything is statically linked. Hence +# no `-mcpu`, no `-mtune`, no funny business. + +CC = $(CROSS_COMPILE)gcc +LD = $(CROSS_COMPILE)gcc +ISA ?= rv64imafdc_zicntr_zicsr_zifencei_zihpm_zca_zcd_zba_zbb +INCLUDES = -Iinclude/ +ASFLAGS = -march=$(ISA) -mabi=lp64d $(INCLUDES) +CCFLAGS = $(ASFLAGS) -std=gnu17 +WARNINGS = -Werror -Wall -Wextra -Wcast-align -Wcast-qual -Winit-self \ + -Wmissing-include-dirs -Wredundant-decls -Wshadow -Wsign-conversion \ + -Wswitch-default -Wundef -Wunreachable-code +CCFLAGS += $(WARNINGS) +LDFLAGS = -static $(INCLUDES) + +## +# Optional parameters for QEMU and gdb. + +QEMU_FLAGS ?= +GDB_EXTRA_FLAGS ?= + +# You can pass an optional `DEBUG` variable to manipulate the build type. +DEBUG ?= +ifeq ($(strip $(DEBUG)),) + CCFLAGS += -O3 +else + CCFLAGS += -g -O0 -D__DEBUG__ +endif + +# Image being mounted for QEMU's consumption. +MOUNT_DEST_DIR ?= /mnt/pudc +MOUNT_DEST_IMG ?= disk.img + +## +# Targets + +.PHONY: all +all: clean $(EXE) + +.PHONY: $(EXE) +$(EXE): $(OBJ) + $(E) " LD " $@ + $(Q) $(LD) $(LDFLAGS) $+ -o $(EXE) + +.c.o: + $(E) " CC " $(basename $@) + $(Q) $(CC) $(CCFLAGS) -c $< -o $@ + +.S.o: + $(E) " CC " $(*F) + $(Q) $(CC) $(ASFLAGS) -c $< -o $@ + +# Ensure that we have LINUX_SOURCE defined. +.PHONY: qemu_env +qemu_env: + $(if $(wildcard $(LINUX_SOURCE)),,$(error The 'LINUX_SOURCE' environment variable must be set to a non-empty value.)) + +# Insert the built $(EXE) into the image to be mounted via QEMU. +.PHONY: qemu_prepare_disk +qemu_prepare_disk: + $(E) " DISK $(MOUNT_DEST_IMG)" + $(Q) sudo mkdir -p $(MOUNT_DEST_DIR) + $(Q) sudo mount -o loop $(MOUNT_DEST_IMG) $(MOUNT_DEST_DIR) + $(Q) sudo mkdir -p $(MOUNT_DEST_DIR)/bin/ $(MOUNT_DEST_DIR)/dev/ \ + $(MOUNT_DEST_DIR)/etc/ $(MOUNT_DEST_DIR)/proc/ $(MOUNT_DEST_DIR)/run/pudc/ \ + $(MOUNT_DEST_DIR)/sbin/ $(MOUNT_DEST_DIR)/sys/ $(MOUNT_DEST_DIR)/tmp/ + $(Q) sudo cp $(EXE) $(MOUNT_DEST_DIR)/sbin/$(EXE) + $(Q) sudo umount $(MOUNT_DEST_DIR) + +# Run QEMU by using the built $(KERNEL) and the $(MOUNT_DEST_IMG), which +# contains the $(EXE) binary as '/sbin/init'. +.PHONY: qemu +qemu: qemu_env $(EXE) qemu_prepare_disk + $(E) " QEMU kernel=$(KERNEL)" + $(Q) qemu-system-riscv64 -machine virt -smp 4 -m 8G -kernel $(KERNEL) \ + -nographic $(QEMU_FLAGS) \ + -drive file=$(MOUNT_DEST_IMG),format=raw,if=virtio \ + -append "root=/dev/vda rw console=ttyS0" + +.PHONY: clean +clean: + $(Q) rm -f $(OBJ) $(EXE) + +.PHONY: lint +lint: + $(Q) git ls-files *.c *.h | xargs clang-format --dry-run --Werror diff --git a/README.md b/README.md new file mode 100644 index 0000000..f1b50d6 --- /dev/null +++ b/README.md @@ -0,0 +1,121 @@ +## Summary + +**pudc**: **P**ID **u** **d**iu **c**oses (which loosely translates to "PID 1 +utters stuff"). + +Yet another blog site, but this time around cooked like this: + +- The backend is written in a mixture of C and RISC-V assembly. +- The backend is actually PID1 (for real, not within a container). +- We poll and parse incoming HTTP requests ourselves. +- The frontend is a mere HTML page with [htmx](https://htmx.org/). + +In the end, this repository is more of an exercise in order to dig deeper into +the Linux kernel, its interfaces, the RISC-V architecture, and all the dragons +in between. + +## Build + +*NOTE*: if you are running on a non-RISCV machine, then you will need to do +cross compilation. This is easily achieved by installing the proper package from +your Linux distribution (e.g. for openSUSE it's `cross-riscv64-`) and +then setting the `CROSS_COMPILE` environment variable. This environment variable +is used pretty much like in the Linux Kernel and many other projects: it just +sets a prefix for `as`, `ld`, etc. + +You can build everything with the default `make` target. After that, you can use +QEMU in order to test the given binary. For that you need QEMU with RISC-V +support (i.e. the `qemu-system-riscv64` command), and you need to pass the +`LINUX_SOURCE` option with the path to the Linux kernel source code. Another +requirement is the file system. This is supposed to be available and, if we are +going to use QEMU, then you need to pass an image with a file system in it. You +can generate this image like so: + +```sh +$ qemu-img create -f raw disk.img 10G +$ sudo mkfs.{btrfs,ext4,whatever} -F disk.img +$ make qemu_prepare_disk +``` + +Note that the `qemu_prepare_disk` target will mount into `/mnt/pudc` this disk +and populate it with a minimal hierarchy and the executable produced by the +earlier `make` default target. If you want your image to be named in another +way, change the commands above and set the `MOUNT_DEST_IMAGE` environment +variable, as that will be used for the `qemu_prepare_disk` target. + +Compiling the Linux Kernel is pretty easy. If you are cross compiling you must +make sure that the `ARCH` environment variable is set to `riscv` and that the +`CROSS_COMPILE` one is also set as the toolchain prefix (just like the +instructions for this project). With that, the default configuration from `make +defconfig` will already give you support for virtualized RISC-V environments and +all SoCs. Otherwise, just select with `menuconfig` whatever it is that you need. + +With all of that, just run `make qemu`, which will start QEMU in `-nographic` +mode with the given Linux Kernel and the init program that was built from this +project. You can quit from QEMU in `-nographic` mode by pressing `Ctrl+A` and +then `X`. + +Hence, a complete run down on how to build and run this project (by using QEMU): + +``` sh +# Exporting variables. +$ export ARCH=riscv +$ export LINUX_SOURCE= +$ export CROSS_COMPILE=riscv64-suse-linux- # on openSUSE. Change it for your case. + +# Kernel +$ cd $LINUX_SOURCE +$ make defconfig +$ make -j $(nproc) +# -> your image is now at arch/riscv/boot/Image. + +# pudc +$ cd +## If you don't have an .img disk, then: +## $ qemu-img create -f raw disk.img 10G +## $ sudo mkfs.{btrfs,ext4,whatever} -F disk.img +$ make qemu +# -> this will build everything and launch QEMU in -nographic mode (output from the serial port). +``` + +Some other options from the given Makefile: + +- Everything is set to be quiet. If you want to remove that, just set `V=1` when + calling any make target. +- If you pass `DEBUG=1`, then further debug messages will be shown. +- The value being passed to GCC's `-march` is the one that matches my + VisionFive2 board. If you want to tune this differently, simply set + `ISA=` on any make target. + +## Architecture + +Still in the works but something like: + +- zsbl -> opensbi -> kernel -> init +- init: + - poll and, for each incoming HTTP request (using io_uring): + - clone with proper flags (with control for fork-bombs) + - http parser + - Database with either embedded sqlite or plain dirs/files. + - reply back with htmx + +### Alternatives + +#### Rust + +I actually considered building this with Rust, but since I figured I would be +doing a lot of interfacing with libraries from the Linux kernel, then I'd also +need to work on safe abstractions for all that C code. Since I didn't want to do +any of that for this project, I just sticked with C. + +#### nolibc et. al. + +I tried to work with `nolibc` as integrated from the Linux kernel, but then I +couldn't build the whole thing because of `-Werror` and the fact that `nolibc` +is riddled with a diverse set of warnings. Hence, maybe in the future I add a +way to support this, but for now it's good ol' `glibc`. + +## License + +Released under the [GPLv3+](http://www.gnu.org/licenses/gpl-3.0.txt), Copyright +(C) 2024-Ω Miquel Sabaté Solà. diff --git a/include/pudc/compiler.h b/include/pudc/compiler.h new file mode 100644 index 0000000..c1c3c87 --- /dev/null +++ b/include/pudc/compiler.h @@ -0,0 +1,22 @@ +// SPDX-License-Identifier: GPL-3.0-or-later +/* + * Copyright (C) 2024-Ω Miquel Sabaté Solà + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#pragma once + +#define __noreturn __attribute__((__noreturn__)) +#define __unused(x) (void)x diff --git a/include/pudc/print.h b/include/pudc/print.h new file mode 100644 index 0000000..1a5436c --- /dev/null +++ b/include/pudc/print.h @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-3.0-or-later +/* + * Copyright (C) 2024-Ω Miquel Sabaté Solà + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#pragma once + +#include +#include +#include + +/** + * The type of output being delivered. + * + * NOTE: internal; use the 'pr_*' macros instead. + */ +enum print_type { + info, + error, + debug, +}; + +/** + * Print the given @message into the @stream while prefixing it with the given + * @type. The @should_halt boolean determines whether execution should halt or + * not after printing everything. + * + * NOTE: internal; use the 'pr_*' macros instead. + */ +void pr_out(bool should_halt, FILE *stream, enum print_type type, const char *const message, ...); + +/** + * Print the given @message to the standard output. This @message is formatted + * with stdargs and it will be prefixed with the current local time. + */ +#define pr_info(message, ...) pr_out(false, stdout, info, message, ##__VA_ARGS__) + +/** + * Like 'pr_info', but into the stderr. Moreover, the first argument + * @should_halt determines whether this function should halt + */ +#define pr_error(should_halt, message, ...) \ + pr_out(should_halt, stderr, error, message, ##__VA_ARGS__) + +/** + * Like 'pr_info' but with "debug" as an @id and it only prints something if + * __DEBUG__ has been defined. + */ +#ifdef __DEBUG__ +#define pr_debug(message, ...) pr_out(false, stdout, debug, message, ##__VA_ARGS__) +#else +#define pr_debug(message, ...) (void)(message) +#endif diff --git a/include/pudc/pudc.h b/include/pudc/pudc.h new file mode 100644 index 0000000..e76b43d --- /dev/null +++ b/include/pudc/pudc.h @@ -0,0 +1,32 @@ +// SPDX-License-Identifier: GPL-3.0-or-later +/* + * Copyright (C) 2024-Ω Miquel Sabaté Solà + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#pragma once + +/** + * Version of pudc. + */ +#define PUDC_VERSION "0.1.0" + +/** + * Halt execution of the program by looping indefinitely. + */ +#define halt() \ + for (;;) { \ + ; \ + } diff --git a/src/main.c b/src/main.c new file mode 100644 index 0000000..631b3c2 --- /dev/null +++ b/src/main.c @@ -0,0 +1,91 @@ +// SPDX-License-Identifier: GPL-3.0-or-later +/* + * Copyright (C) 2024-Ω Miquel Sabaté Solà + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#define _GNU_SOURCE + +#include +#include +#include +#include + +#include +#include +#include + +/** + * Ensure that our current PID and TID are all 1, otherwise halt execution. + */ +void ensure_pid_tid_one(void) +{ + pid_t pid, tid; + + pid = getpid(); + if (pid != 1) { + pr_error(true, "'pudc' is supposed to be PID 1, but it is PID %d", pid); + } + + tid = gettid(); + if (tid != 1) { + pr_error(true, "'pudc' is supposed to be TID 1, but it is TID %d", tid); + } +} + +/** + * Ensure that the given @path is an existing directory. + * + * NOTE: this function will halt execution in case of error. + */ +void ensure_dir(const char *const path) +{ + struct stat st; + int status = stat(path, &st); + + if (!status) { + // Nothing to be done! + if (S_ISDIR(st.st_mode)) { + pr_debug("directory '%s' found", path); + return; + } + + // It exists but it's not a directory, bail out. + pr_error(true, "'%s' exists and it's not a directory", path); + } + + pr_error(true, "failed to stat '%s'", path); +} + +__noreturn int main(void) +{ + pr_info("starting pudc v%s", PUDC_VERSION); + + /* + * Early checks. + */ + ensure_pid_tid_one(); + ensure_dir("/run/pudc"); + + // TODO + halt(); + + /* + * We should never reach this point, and if we do just halt. The second + * 'halt' is just to make the compiler happy. + */ + pr_error(true, "pudc is no longer accepting requests. Halting execution..", "asd"); + halt(); +} diff --git a/src/print.c b/src/print.c new file mode 100644 index 0000000..364a20b --- /dev/null +++ b/src/print.c @@ -0,0 +1,94 @@ +// SPDX-License-Identifier: GPL-3.0-or-later +/* + * Copyright (C) 2024-Ω Miquel Sabaté Solà + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include +#include +#include +#include + +#include +#include + +/** + * Prints the current local time into the given @stream. If fetching the current + * local time fails, then it does nothing. + */ +void pr_time(FILE *stream) +{ + time_t current_time = time(NULL); + struct tm *tm_info = NULL; + char buffer[32]; + + if (current_time != (time_t)-1) { + tm_info = localtime(¤t_time); + strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", tm_info); + fprintf(stream, "[%s] ", buffer); + fflush(stream); + } +} + +void pr_out(bool should_halt, FILE *stream, enum print_type type, const char *const message, ...) +{ + va_list args; + + pr_time(stream); + + fprintf(stream, "pudc ("); + fflush(stream); + + switch (type) { + case debug: + fprintf(stream, "debug"); + break; + case error: + fprintf(stream, "error"); + break; + case info: + default: + fprintf(stream, "info"); + break; + }; + fflush(stream); + + fprintf(stream, "): "); + fflush(stream); + + va_start(args, message); + vfprintf(stream, message, args); + fflush(stream); + va_end(args); + + /* + * 'errno' is quite unreliable, so only deal with it if this was called via + * 'pr_error'. + */ + if (type == error) { + fprintf(stream, ": "); + fflush(stream); + perror(NULL); + fflush(stream); + } else { + fprintf(stream, ".\n"); + fflush(stream); + } + + if (should_halt) { + halt(); + } +} -- cgit v1.2.3