我的学习之旅(7) build工具

来源：互联网发布：mac pro测评编辑：程序博客网时间：2024/06/05 07:45

build_boot.c源代码

#include <stdio.h>#include <string.h>#include <stdlib.h> #include <sys/types.h> #include <sys/stat.h>#include <linux/fs.h>#include <unistd.h>#include <fcntl.h>#define MINIX_HEADER_LEN 32#define BOOT_LENGTH 512int main(int argc, char *argv[] ){ char buf[1024]; int fd; int len; if( argc != 3 ) {  printf("no input file\n");  return 0; } sprintf(buf,"rm -f %s", argv[2]); system(buf); sprintf(buf,"touch %s", argv[2]); system(buf); fd = open(argv[1], O_RDONLY, 0 ); if( fd < 0 ){  printf("open file:%s failed\n", argv[1]);  return 0; } if( read(fd, buf, MINIX_HEADER_LEN)!= MINIX_HEADER_LEN) {  close(fd);  printf("Invalid mini header len:%d\n", MINIX_HEADER_LEN);  return 0; } memset(buf, 0x0, sizeof(buf)); len = read(fd, buf, sizeof(buf)); if( len != BOOT_LENGTH ) {  printf("wrong boot length:%d, should be %d\n", len, BOOT_LENGTH);  return 0; }  close(fd);        fd = open(argv[2], O_WRONLY, O_CREAT | O_EXCL | O_SYNC );        if( fd < 0 ){                printf("open file:%s failed\n", argv[2]);                return 0;        } len = write(fd, buf, BOOT_LENGTH); if( len != BOOT_LENGTH ){  printf("write failed with len:%d, should be:%d\n", len, BOOT_LENGTH);  return 0; } close(fd); return 0;}

build_setup.c和build_boot.c类似。

编译： gcc -Wall -O2 -fomit-frame-pointer -o build_boot build_boot.c

gcc -Wall -O2 -fomit-frame-pointer -o build_boot build_setup.c

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