mirror of
https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-18 20:36:31 +00:00
命名管道系统调用以及文件系统兼容特殊文件类型的接口 (#397)
* 修复pipe2在读端或写端关闭后还阻塞问题。 * 实现命名管道机制，增加特殊文件类型兼容普通文件系统的接口。 * 普通文件系统能够适配特殊文件(命名管道等)
This commit is contained in:
GnoCiYeH
GitHub
26
user/apps/test_mkfifo/Makefile
Normal file
26
user/apps/test_mkfifo/Makefile
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@ -0,0 +1,26 @@
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CC=$(DragonOS_GCC)/x86_64-elf-gcc
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LD=ld
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OBJCOPY=objcopy
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# 修改这里，把它改为你的relibc的sysroot路径
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RELIBC_OPT=$(DADK_BUILD_CACHE_DIR_RELIBC_0_1_0)
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CFLAGS=-I $(RELIBC_OPT)/include -D__dragonos__
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tmp_output_dir=$(ROOT_PATH)/bin/tmp/user
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output_dir=$(DADK_BUILD_CACHE_DIR_TEST_MKFIFO_0_1_0)
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LIBC_OBJS:=$(shell find $(RELIBC_OPT)/lib -name "*.o" | sort )
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LIBC_OBJS+=$(RELIBC_OPT)/lib/libc.a
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all: main.o
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mkdir -p $(tmp_output_dir)
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$(LD) -b elf64-x86-64 -z muldefs -o $(tmp_output_dir)/test_mkfifo $(shell find . -name "*.o") $(LIBC_OBJS) -T link.lds
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$(OBJCOPY) -I elf64-x86-64 -R ".eh_frame" -R ".comment" -O elf64-x86-64 $(tmp_output_dir)/test_mkfifo $(output_dir)/test_mkfifo.elf
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mv $(output_dir)/test_mkfifo.elf $(output_dir)/test_mkfifo
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main.o: main.c
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$(CC) $(CFLAGS) -c main.c -o main.o
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clean:
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rm -f *.o
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239
user/apps/test_mkfifo/link.lds
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239
user/apps/test_mkfifo/link.lds
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/* Script for -z combreloc */
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/* Copyright (C) 2014-2020 Free Software Foundation, Inc.
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Copying and distribution of this script, with or without modification,
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are permitted in any medium without royalty provided the copyright
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notice and this notice are preserved. */
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OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64",
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"elf64-x86-64")
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OUTPUT_ARCH(i386:x86-64)
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ENTRY(_start)
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SECTIONS
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{
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/* Read-only sections, merged into text segment: */
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PROVIDE (__executable_start = SEGMENT_START("text-segment", 0x400000)); . = SEGMENT_START("text-segment", 0x20000000) + SIZEOF_HEADERS;
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.interp : { *(.interp) }
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.note.gnu.build-id : { *(.note.gnu.build-id) }
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.hash : { *(.hash) }
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.gnu.hash : { *(.gnu.hash) }
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.dynsym : { *(.dynsym) }
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.dynstr : { *(.dynstr) }
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.gnu.version : { *(.gnu.version) }
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.gnu.version_d : { *(.gnu.version_d) }
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.gnu.version_r : { *(.gnu.version_r) }
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.rela.dyn :
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{
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*(.rela.init)
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*(.rela.text .rela.text.* .rela.gnu.linkonce.t.*)
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*(.rela.fini)
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*(.rela.rodata .rela.rodata.* .rela.gnu.linkonce.r.*)
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*(.rela.data .rela.data.* .rela.gnu.linkonce.d.*)
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*(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*)
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*(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*)
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*(.rela.ctors)
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*(.rela.dtors)
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*(.rela.got)
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*(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*)
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*(.rela.ldata .rela.ldata.* .rela.gnu.linkonce.l.*)
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*(.rela.lbss .rela.lbss.* .rela.gnu.linkonce.lb.*)
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*(.rela.lrodata .rela.lrodata.* .rela.gnu.linkonce.lr.*)
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*(.rela.ifunc)
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}
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.rela.plt :
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{
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*(.rela.plt)
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PROVIDE_HIDDEN (__rela_iplt_start = .);
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*(.rela.iplt)
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PROVIDE_HIDDEN (__rela_iplt_end = .);
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}
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. = ALIGN(CONSTANT (MAXPAGESIZE));
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.init :
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{
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KEEP (*(SORT_NONE(.init)))
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}
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.plt : { *(.plt) *(.iplt) }
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.plt.got : { *(.plt.got) }
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.plt.sec : { *(.plt.sec) }
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.text :
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{
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*(.text.unlikely .text.*_unlikely .text.unlikely.*)
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*(.text.exit .text.exit.*)
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*(.text.startup .text.startup.*)
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*(.text.hot .text.hot.*)
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*(.text .stub .text.* .gnu.linkonce.t.*)
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/* .gnu.warning sections are handled specially by elf.em. */
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*(.gnu.warning)
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}
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.fini :
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{
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KEEP (*(SORT_NONE(.fini)))
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}
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PROVIDE (__etext = .);
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PROVIDE (_etext = .);
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PROVIDE (etext = .);
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. = ALIGN(CONSTANT (MAXPAGESIZE));
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/* Adjust the address for the rodata segment. We want to adjust up to
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the same address within the page on the next page up. */
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. = SEGMENT_START("rodata-segment", ALIGN(CONSTANT (MAXPAGESIZE)) + (. & (CONSTANT (MAXPAGESIZE) - 1)));
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.rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
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.rodata1 : { *(.rodata1) }
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.eh_frame_hdr : { *(.eh_frame_hdr) *(.eh_frame_entry .eh_frame_entry.*) }
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.eh_frame : ONLY_IF_RO { KEEP (*(.eh_frame)) *(.eh_frame.*) }
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.gcc_except_table : ONLY_IF_RO { *(.gcc_except_table .gcc_except_table.*) }
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.gnu_extab : ONLY_IF_RO { *(.gnu_extab*) }
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/* These sections are generated by the Sun/Oracle C++ compiler. */
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.exception_ranges : ONLY_IF_RO { *(.exception_ranges*) }
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/* Adjust the address for the data segment. We want to adjust up to
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the same address within the page on the next page up. */
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. = DATA_SEGMENT_ALIGN (CONSTANT (MAXPAGESIZE), CONSTANT (COMMONPAGESIZE));
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/* Exception handling */
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.eh_frame : ONLY_IF_RW { KEEP (*(.eh_frame)) *(.eh_frame.*) }
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.gnu_extab : ONLY_IF_RW { *(.gnu_extab) }
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.gcc_except_table : ONLY_IF_RW { *(.gcc_except_table .gcc_except_table.*) }
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.exception_ranges : ONLY_IF_RW { *(.exception_ranges*) }
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/* Thread Local Storage sections */
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.tdata :
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{
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PROVIDE_HIDDEN (__tdata_start = .);
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*(.tdata .tdata.* .gnu.linkonce.td.*)
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}
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.tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
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.preinit_array :
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{
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PROVIDE_HIDDEN (__preinit_array_start = .);
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KEEP (*(.preinit_array))
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PROVIDE_HIDDEN (__preinit_array_end = .);
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}
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.init_array :
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{
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PROVIDE_HIDDEN (__init_array_start = .);
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KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))
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KEEP (*(.init_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .ctors))
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PROVIDE_HIDDEN (__init_array_end = .);
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}
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.fini_array :
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{
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PROVIDE_HIDDEN (__fini_array_start = .);
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KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))
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KEEP (*(.fini_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .dtors))
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PROVIDE_HIDDEN (__fini_array_end = .);
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}
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.ctors :
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{
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/* gcc uses crtbegin.o to find the start of
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the constructors, so we make sure it is
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first. Because this is a wildcard, it
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doesn't matter if the user does not
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actually link against crtbegin.o; the
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linker won't look for a file to match a
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wildcard. The wildcard also means that it
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doesn't matter which directory crtbegin.o
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is in. */
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KEEP (*crtbegin.o(.ctors))
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KEEP (*crtbegin?.o(.ctors))
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/* We don't want to include the .ctor section from
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the crtend.o file until after the sorted ctors.
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The .ctor section from the crtend file contains the
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end of ctors marker and it must be last */
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KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))
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KEEP (*(SORT(.ctors.*)))
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KEEP (*(.ctors))
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}
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.dtors :
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{
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KEEP (*crtbegin.o(.dtors))
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KEEP (*crtbegin?.o(.dtors))
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KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))
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KEEP (*(SORT(.dtors.*)))
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KEEP (*(.dtors))
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}
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.jcr : { KEEP (*(.jcr)) }
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.data.rel.ro : { *(.data.rel.ro.local* .gnu.linkonce.d.rel.ro.local.*) *(.data.rel.ro .data.rel.ro.* .gnu.linkonce.d.rel.ro.*) }
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.dynamic : { *(.dynamic) }
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.got : { *(.got) *(.igot) }
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. = DATA_SEGMENT_RELRO_END (SIZEOF (.got.plt) >= 24 ? 24 : 0, .);
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.got.plt : { *(.got.plt) *(.igot.plt) }
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.data :
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{
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*(.data .data.* .gnu.linkonce.d.*)
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SORT(CONSTRUCTORS)
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}
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.data1 : { *(.data1) }
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_edata = .; PROVIDE (edata = .);
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. = .;
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__bss_start = .;
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.bss :
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{
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*(.dynbss)
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*(.bss .bss.* .gnu.linkonce.b.*)
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*(COMMON)
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/* Align here to ensure that the .bss section occupies space up to
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_end. Align after .bss to ensure correct alignment even if the
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.bss section disappears because there are no input sections.
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FIXME: Why do we need it? When there is no .bss section, we do not
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pad the .data section. */
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. = ALIGN(. != 0 ? 64 / 8 : 1);
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}
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.lbss :
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{
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*(.dynlbss)
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*(.lbss .lbss.* .gnu.linkonce.lb.*)
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*(LARGE_COMMON)
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}
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. = ALIGN(64 / 8);
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. = SEGMENT_START("ldata-segment", .);
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.lrodata ALIGN(CONSTANT (MAXPAGESIZE)) + (. & (CONSTANT (MAXPAGESIZE) - 1)) :
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{
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*(.lrodata .lrodata.* .gnu.linkonce.lr.*)
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}
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.ldata ALIGN(CONSTANT (MAXPAGESIZE)) + (. & (CONSTANT (MAXPAGESIZE) - 1)) :
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{
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*(.ldata .ldata.* .gnu.linkonce.l.*)
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. = ALIGN(. != 0 ? 64 / 8 : 1);
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}
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. = ALIGN(64 / 8);
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_end = .; PROVIDE (end = .);
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. = DATA_SEGMENT_END (.);
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/* Stabs debugging sections. */
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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.stab.excl 0 : { *(.stab.excl) }
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.stab.exclstr 0 : { *(.stab.exclstr) }
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.stab.index 0 : { *(.stab.index) }
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.stab.indexstr 0 : { *(.stab.indexstr) }
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.comment 0 : { *(.comment) }
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.gnu.build.attributes : { *(.gnu.build.attributes .gnu.build.attributes.*) }
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/* DWARF debug sections.
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Symbols in the DWARF debugging sections are relative to the beginning
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of the section so we begin them at 0. */
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/* DWARF 1 */
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.debug 0 : { *(.debug) }
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.line 0 : { *(.line) }
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/* GNU DWARF 1 extensions */
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.debug_srcinfo 0 : { *(.debug_srcinfo) }
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.debug_sfnames 0 : { *(.debug_sfnames) }
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/* DWARF 1.1 and DWARF 2 */
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.debug_aranges 0 : { *(.debug_aranges) }
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.debug_pubnames 0 : { *(.debug_pubnames) }
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/* DWARF 2 */
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.debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
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.debug_abbrev 0 : { *(.debug_abbrev) }
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.debug_line 0 : { *(.debug_line .debug_line.* .debug_line_end) }
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.debug_frame 0 : { *(.debug_frame) }
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.debug_str 0 : { *(.debug_str) }
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.debug_loc 0 : { *(.debug_loc) }
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.debug_macinfo 0 : { *(.debug_macinfo) }
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/* SGI/MIPS DWARF 2 extensions */
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.debug_weaknames 0 : { *(.debug_weaknames) }
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.debug_funcnames 0 : { *(.debug_funcnames) }
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.debug_typenames 0 : { *(.debug_typenames) }
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.debug_varnames 0 : { *(.debug_varnames) }
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/* DWARF 3 */
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.debug_pubtypes 0 : { *(.debug_pubtypes) }
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.debug_ranges 0 : { *(.debug_ranges) }
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/* DWARF Extension. */
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.debug_macro 0 : { *(.debug_macro) }
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.debug_addr 0 : { *(.debug_addr) }
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.gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }
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/DISCARD/ : { *(.note.GNU-stack) *(.gnu_debuglink) *(.gnu.lto_*) }
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}
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78
user/apps/test_mkfifo/main.c
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78
user/apps/test_mkfifo/main.c
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/wait.h>
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#define BUFFER_SIZE 256
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#define PIPE_NAME "/bin/fifo"
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int main()
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{
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pid_t pid;
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int pipe_fd;
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char buffer[BUFFER_SIZE];
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int bytes_read;
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int status;
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// 创建命名管道
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mkfifo(PIPE_NAME, 0666);
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// 创建子进程
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pid = fork();
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if (pid < 0)
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{
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fprintf(stderr, "Fork failed\n");
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return 1;
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}
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else if (pid == 0)
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{
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// 子进程
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// 打开管道以供读取
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pipe_fd = open(PIPE_NAME, O_RDONLY);
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// 从管道中读取数据
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bytes_read = read(pipe_fd, buffer, BUFFER_SIZE);
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if (bytes_read > 0)
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{
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printf("Child process received message: %s\n", buffer);
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}
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// 关闭管道文件描述符
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close(pipe_fd);
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// 删除命名管道
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unlink(PIPE_NAME);
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exit(0);
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}
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else
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{
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// 父进程
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// 打开管道以供写入
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pipe_fd = open(PIPE_NAME, O_WRONLY);
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// 向管道写入数据
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const char *message = "Hello from parent process";
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write(pipe_fd, message, strlen(message) + 1);
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// 关闭管道文件描述符
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close(pipe_fd);
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// 等待子进程结束
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waitpid(pid, &status, 0);
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if (WIFEXITED(status))
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{
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printf("Child process exited with status: %d\n", WEXITSTATUS(status));
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}
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}
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return 0;
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}
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