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