?? fcntl.c
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/* * linux/fs/fcntl.c * * (C) 1991 Linus Torvalds */#include <string.h>#include <errno.h>#include <linux/sched.h>#include <linux/kernel.h>#include <asm/segment.h>#include <fcntl.h>#include <sys/stat.h>extern int sys_close(int fd);static int dupfd(unsigned int fd, unsigned int arg){ if (fd >= NR_OPEN || !current->filp[fd]) return -EBADF; if (arg >= NR_OPEN) return -EINVAL; while (arg < NR_OPEN) if (current->filp[arg]) arg++; else break; if (arg >= NR_OPEN) return -EMFILE; current->close_on_exec &= ~(1<<arg); (current->filp[arg] = current->filp[fd])->f_count++; return arg;}int sys_dup2(unsigned int oldfd, unsigned int newfd){ sys_close(newfd); return dupfd(oldfd,newfd);}int sys_dup(unsigned int fildes){ return dupfd(fildes,0);}int sys_fcntl(unsigned int fd, unsigned int cmd, unsigned long arg){ struct file * filp; if (fd >= NR_OPEN || !(filp = current->filp[fd])) return -EBADF; switch (cmd) { case F_DUPFD: return dupfd(fd,arg); case F_GETFD: return (current->close_on_exec>>fd)&1; case F_SETFD: if (arg&1) current->close_on_exec |= (1<<fd); else current->close_on_exec &= ~(1<<fd); return 0; case F_GETFL: return filp->f_flags; case F_SETFL: filp->f_flags &= ~(O_APPEND | O_NONBLOCK); filp->f_flags |= arg & (O_APPEND | O_NONBLOCK); return 0; case F_GETLK: case F_SETLK: case F_SETLKW: return -1; default: return -1; }}?? 快捷鍵說明
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