C语言自己实现linux下cp文件复制命令
发布时间:2020-12-16 07:46:33 所属栏目:百科 来源:网络整理
导读:今天PHP站长网 52php.cn把收集自互联网的代码分享给大家,仅供参考。 #include stdio.h#include stdlib.h#include string.h#include errno.h#include unistd.h#include fcntl.h#include sys/types.h int main(int argc,ch
以下代码由PHP站长网 52php.cn收集自互联网 现在PHP站长网小编把它分享给大家,仅供参考 #include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <unistd.h> #include <fcntl.h> #include <sys/types.h> int main(int argc,char *argv[]) { char *buf = NULL; int fd_src = -1; int fd_dest = -1; int buf_size = 4096; int cnt = 0; struct flock lock; if (argc < 3) { printf("usage: %s <src_file> <dest_file> [buf_size]n",argv[0]); return 0; } if ((fd_src=open(argv[1],O_RDONLY)) == -1) { perror("open src. file"); return 1; } if ((fd_dest=open(argv[2],O_WRONLY|O_CREAT|O_EXCL,0664)) == -1) { perror("open dest. file"); close(fd_src); return 2; } if (argc == 4) { buf_size = atoi(argv[3]); } buf = sbrk(buf_size); if ((void*)-1 == buf) { perror("malloc"); close(fd_src); close(fd_dest); return 3; } lock.l_type = F_RDLCK; lock.l_whence = SEEK_SET; lock.l_start = 0; lock.l_len = 0; lock.l_pid = -1; if (fcntl(fd_src,F_SETLK,&lock) == -1) { fprintf(stderr,"%s has been locked by other processn",argv[1]); close(fd_src); close(fd_dest); return 8; } errno = 0; while ((cnt = read(fd_src,buf,buf_size)) > 0) { if (write(fd_dest,cnt) < cnt) { perror("write"); close(fd_src); close(fd_dest); return 4; } } if (0 != errno) { perror("read"); } close(fd_src); fd_src = -1; close(fd_dest); fd_dest = -1; brk(buf); return 0; } 以上内容由PHP站长网【52php.cn】收集整理供大家参考研究 如果以上内容对您有帮助,欢迎收藏、点赞、推荐、分享。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |