2ace87b950
Blairsorblade noticed some confusion between our use of a system call's return value and errno. This patch fixes a number of related bugs - using errno instead of a return value using a return value instead of errno forgetting to negate a error return to get a positive error code Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
669 lines
12 KiB
C
669 lines
12 KiB
C
/*
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* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/uio.h>
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#include "os.h"
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#include "user.h"
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#include "kern_util.h"
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static void copy_stat(struct uml_stat *dst, struct stat64 *src)
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{
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*dst = ((struct uml_stat) {
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.ust_dev = src->st_dev, /* device */
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.ust_ino = src->st_ino, /* inode */
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.ust_mode = src->st_mode, /* protection */
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.ust_nlink = src->st_nlink, /* number of hard links */
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.ust_uid = src->st_uid, /* user ID of owner */
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.ust_gid = src->st_gid, /* group ID of owner */
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.ust_size = src->st_size, /* total size, in bytes */
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.ust_blksize = src->st_blksize, /* blocksize for filesys I/O */
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.ust_blocks = src->st_blocks, /* number of blocks allocated */
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.ust_atime = src->st_atime, /* time of last access */
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.ust_mtime = src->st_mtime, /* time of last modification */
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.ust_ctime = src->st_ctime, /* time of last change */
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});
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}
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int os_stat_fd(const int fd, struct uml_stat *ubuf)
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{
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struct stat64 sbuf;
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int err;
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do {
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err = fstat64(fd, &sbuf);
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} while((err < 0) && (errno == EINTR)) ;
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if(err < 0)
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return(-errno);
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if(ubuf != NULL)
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copy_stat(ubuf, &sbuf);
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return(err);
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}
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int os_stat_file(const char *file_name, struct uml_stat *ubuf)
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{
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struct stat64 sbuf;
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int err;
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do {
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err = stat64(file_name, &sbuf);
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} while((err < 0) && (errno == EINTR)) ;
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if(err < 0)
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return(-errno);
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if(ubuf != NULL)
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copy_stat(ubuf, &sbuf);
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return(err);
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}
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int os_access(const char* file, int mode)
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{
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int amode, err;
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amode=(mode&OS_ACC_R_OK ? R_OK : 0) | (mode&OS_ACC_W_OK ? W_OK : 0) |
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(mode&OS_ACC_X_OK ? X_OK : 0) | (mode&OS_ACC_F_OK ? F_OK : 0) ;
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err = access(file, amode);
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if(err < 0)
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return(-errno);
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return(0);
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}
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void os_print_error(int error, const char* str)
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{
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errno = error < 0 ? -error : error;
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perror(str);
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}
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/* FIXME? required only by hostaudio (because it passes ioctls verbatim) */
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int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
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{
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int err;
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err = ioctl(fd, cmd, arg);
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if(err < 0)
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return(-errno);
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return(err);
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}
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int os_window_size(int fd, int *rows, int *cols)
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{
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struct winsize size;
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if(ioctl(fd, TIOCGWINSZ, &size) < 0)
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return(-errno);
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*rows = size.ws_row;
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*cols = size.ws_col;
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return(0);
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}
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int os_new_tty_pgrp(int fd, int pid)
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{
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if(ioctl(fd, TIOCSCTTY, 0) < 0)
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return -errno;
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if(tcsetpgrp(fd, pid) < 0)
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return -errno;
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return(0);
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}
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/* FIXME: ensure namebuf in os_get_if_name is big enough */
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int os_get_ifname(int fd, char* namebuf)
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{
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if(ioctl(fd, SIOCGIFNAME, namebuf) < 0)
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return(-errno);
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return(0);
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}
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int os_set_slip(int fd)
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{
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int disc, sencap;
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disc = N_SLIP;
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if(ioctl(fd, TIOCSETD, &disc) < 0)
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return -errno;
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sencap = 0;
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if(ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
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return -errno;
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return(0);
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}
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int os_set_owner(int fd, int pid)
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{
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if(fcntl(fd, F_SETOWN, pid) < 0){
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int save_errno = errno;
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if(fcntl(fd, F_GETOWN, 0) != pid)
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return(-save_errno);
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}
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return(0);
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}
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/* FIXME? moved wholesale from sigio_user.c to get fcntls out of that file */
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int os_sigio_async(int master, int slave)
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{
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int flags;
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flags = fcntl(master, F_GETFL);
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if(flags < 0)
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return -errno;
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if((fcntl(master, F_SETFL, flags | O_NONBLOCK | O_ASYNC) < 0) ||
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(fcntl(master, F_SETOWN, os_getpid()) < 0))
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return -errno;
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if((fcntl(slave, F_SETFL, flags | O_NONBLOCK) < 0))
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return -errno;
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return(0);
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}
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int os_mode_fd(int fd, int mode)
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{
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int err;
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do {
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err = fchmod(fd, mode);
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} while((err < 0) && (errno==EINTR)) ;
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if(err < 0)
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return(-errno);
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return(0);
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}
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int os_file_type(char *file)
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{
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struct uml_stat buf;
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int err;
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err = os_stat_file(file, &buf);
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if(err < 0)
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return(err);
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if(S_ISDIR(buf.ust_mode)) return(OS_TYPE_DIR);
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else if(S_ISLNK(buf.ust_mode)) return(OS_TYPE_SYMLINK);
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else if(S_ISCHR(buf.ust_mode)) return(OS_TYPE_CHARDEV);
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else if(S_ISBLK(buf.ust_mode)) return(OS_TYPE_BLOCKDEV);
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else if(S_ISFIFO(buf.ust_mode)) return(OS_TYPE_FIFO);
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else if(S_ISSOCK(buf.ust_mode)) return(OS_TYPE_SOCK);
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else return(OS_TYPE_FILE);
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}
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int os_file_mode(char *file, struct openflags *mode_out)
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{
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int err;
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*mode_out = OPENFLAGS();
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err = os_access(file, OS_ACC_W_OK);
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if((err < 0) && (err != -EACCES))
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return(err);
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*mode_out = of_write(*mode_out);
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err = os_access(file, OS_ACC_R_OK);
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if((err < 0) && (err != -EACCES))
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return(err);
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*mode_out = of_read(*mode_out);
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return(0);
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}
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int os_open_file(char *file, struct openflags flags, int mode)
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{
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int fd, err, f = 0;
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if(flags.r && flags.w) f = O_RDWR;
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else if(flags.r) f = O_RDONLY;
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else if(flags.w) f = O_WRONLY;
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else f = 0;
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if(flags.s) f |= O_SYNC;
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if(flags.c) f |= O_CREAT;
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if(flags.t) f |= O_TRUNC;
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if(flags.e) f |= O_EXCL;
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fd = open64(file, f, mode);
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if(fd < 0)
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return(-errno);
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if(flags.cl && fcntl(fd, F_SETFD, 1)){
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err = -errno;
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os_close_file(fd);
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return err;
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}
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return(fd);
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}
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int os_connect_socket(char *name)
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{
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struct sockaddr_un sock;
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int fd, err;
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sock.sun_family = AF_UNIX;
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snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
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fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if(fd < 0) {
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err = -errno;
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goto out;
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}
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err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
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if(err) {
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err = -errno;
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goto out_close;
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}
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return fd;
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out_close:
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close(fd);
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out:
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return err;
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}
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void os_close_file(int fd)
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{
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close(fd);
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}
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int os_seek_file(int fd, __u64 offset)
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{
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__u64 actual;
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actual = lseek64(fd, offset, SEEK_SET);
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if(actual != offset)
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return(-errno);
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return(0);
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}
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static int fault_buffer(void *start, int len,
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int (*copy_proc)(void *addr, void *buf, int len))
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{
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int page = getpagesize(), i;
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char c;
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for(i = 0; i < len; i += page){
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if((*copy_proc)(start + i, &c, sizeof(c)))
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return(-EFAULT);
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}
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if((len % page) != 0){
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if((*copy_proc)(start + len - 1, &c, sizeof(c)))
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return(-EFAULT);
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}
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return(0);
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}
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static int file_io(int fd, void *buf, int len,
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int (*io_proc)(int fd, void *buf, int len),
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int (*copy_user_proc)(void *addr, void *buf, int len))
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{
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int n, err;
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do {
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n = (*io_proc)(fd, buf, len);
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if((n < 0) && (errno == EFAULT)){
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err = fault_buffer(buf, len, copy_user_proc);
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if(err)
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return(err);
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n = (*io_proc)(fd, buf, len);
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}
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} while((n < 0) && (errno == EINTR));
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if(n < 0)
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return(-errno);
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return(n);
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}
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int os_read_file(int fd, void *buf, int len)
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{
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return(file_io(fd, buf, len, (int (*)(int, void *, int)) read,
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copy_from_user_proc));
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}
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int os_write_file(int fd, const void *buf, int len)
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{
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return(file_io(fd, (void *) buf, len,
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(int (*)(int, void *, int)) write, copy_to_user_proc));
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}
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int os_file_size(char *file, unsigned long long *size_out)
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{
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struct uml_stat buf;
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int err;
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err = os_stat_file(file, &buf);
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if(err < 0){
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printk("Couldn't stat \"%s\" : err = %d\n", file, -err);
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return(err);
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}
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if(S_ISBLK(buf.ust_mode)){
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int fd, blocks;
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fd = os_open_file(file, of_read(OPENFLAGS()), 0);
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if(fd < 0){
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printk("Couldn't open \"%s\", errno = %d\n", file, -fd);
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return(fd);
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}
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if(ioctl(fd, BLKGETSIZE, &blocks) < 0){
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err = -errno;
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printk("Couldn't get the block size of \"%s\", "
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"errno = %d\n", file, errno);
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os_close_file(fd);
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return(err);
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}
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*size_out = ((long long) blocks) * 512;
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os_close_file(fd);
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return(0);
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}
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*size_out = buf.ust_size;
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return(0);
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}
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int os_file_modtime(char *file, unsigned long *modtime)
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{
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struct uml_stat buf;
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int err;
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err = os_stat_file(file, &buf);
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if(err < 0){
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printk("Couldn't stat \"%s\" : err = %d\n", file, -err);
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return(err);
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}
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*modtime = buf.ust_mtime;
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return(0);
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}
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int os_get_exec_close(int fd, int* close_on_exec)
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{
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int ret;
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do {
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ret = fcntl(fd, F_GETFD);
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} while((ret < 0) && (errno == EINTR)) ;
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if(ret < 0)
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return(-errno);
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*close_on_exec = (ret&FD_CLOEXEC) ? 1 : 0;
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return(ret);
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}
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int os_set_exec_close(int fd, int close_on_exec)
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{
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int flag, err;
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if(close_on_exec) flag = FD_CLOEXEC;
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else flag = 0;
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do {
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err = fcntl(fd, F_SETFD, flag);
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} while((err < 0) && (errno == EINTR)) ;
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|
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if(err < 0)
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return(-errno);
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return(err);
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}
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|
|
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int os_pipe(int *fds, int stream, int close_on_exec)
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{
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int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
|
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|
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err = socketpair(AF_UNIX, type, 0, fds);
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if(err < 0)
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return(-errno);
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|
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if(!close_on_exec)
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return(0);
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|
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err = os_set_exec_close(fds[0], 1);
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|
if(err < 0)
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goto error;
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|
|
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err = os_set_exec_close(fds[1], 1);
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|
if(err < 0)
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goto error;
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|
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return(0);
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|
|
|
error:
|
|
printk("os_pipe : Setting FD_CLOEXEC failed, err = %d\n", -err);
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os_close_file(fds[1]);
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os_close_file(fds[0]);
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return(err);
|
|
}
|
|
|
|
int os_set_fd_async(int fd, int owner)
|
|
{
|
|
int err;
|
|
|
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/* XXX This should do F_GETFL first */
|
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if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){
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err = -errno;
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printk("os_set_fd_async : failed to set O_ASYNC and "
|
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"O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
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return err;
|
|
}
|
|
#ifdef notdef
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if(fcntl(fd, F_SETFD, 1) < 0){
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printk("os_set_fd_async : Setting FD_CLOEXEC failed, "
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"errno = %d\n", errno);
|
|
}
|
|
#endif
|
|
|
|
if((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
|
|
(fcntl(fd, F_SETOWN, owner) < 0)){
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|
err = -errno;
|
|
printk("os_set_fd_async : Failed to fcntl F_SETOWN "
|
|
"(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd,
|
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owner, errno);
|
|
return err;
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
int os_clear_fd_async(int fd)
|
|
{
|
|
int flags = fcntl(fd, F_GETFL);
|
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|
|
flags &= ~(O_ASYNC | O_NONBLOCK);
|
|
if(fcntl(fd, F_SETFL, flags) < 0)
|
|
return(-errno);
|
|
return(0);
|
|
}
|
|
|
|
int os_set_fd_block(int fd, int blocking)
|
|
{
|
|
int flags;
|
|
|
|
flags = fcntl(fd, F_GETFL);
|
|
|
|
if(blocking) flags &= ~O_NONBLOCK;
|
|
else flags |= O_NONBLOCK;
|
|
|
|
if(fcntl(fd, F_SETFL, flags) < 0)
|
|
return -errno;
|
|
|
|
return(0);
|
|
}
|
|
|
|
int os_accept_connection(int fd)
|
|
{
|
|
int new;
|
|
|
|
new = accept(fd, NULL, 0);
|
|
if(new < 0)
|
|
return(-errno);
|
|
return(new);
|
|
}
|
|
|
|
#ifndef SHUT_RD
|
|
#define SHUT_RD 0
|
|
#endif
|
|
|
|
#ifndef SHUT_WR
|
|
#define SHUT_WR 1
|
|
#endif
|
|
|
|
#ifndef SHUT_RDWR
|
|
#define SHUT_RDWR 2
|
|
#endif
|
|
|
|
int os_shutdown_socket(int fd, int r, int w)
|
|
{
|
|
int what, err;
|
|
|
|
if(r && w) what = SHUT_RDWR;
|
|
else if(r) what = SHUT_RD;
|
|
else if(w) what = SHUT_WR;
|
|
else {
|
|
printk("os_shutdown_socket : neither r or w was set\n");
|
|
return(-EINVAL);
|
|
}
|
|
err = shutdown(fd, what);
|
|
if(err < 0)
|
|
return(-errno);
|
|
return(0);
|
|
}
|
|
|
|
int os_rcv_fd(int fd, int *helper_pid_out)
|
|
{
|
|
int new, n;
|
|
char buf[CMSG_SPACE(sizeof(new))];
|
|
struct msghdr msg;
|
|
struct cmsghdr *cmsg;
|
|
struct iovec iov;
|
|
|
|
msg.msg_name = NULL;
|
|
msg.msg_namelen = 0;
|
|
iov = ((struct iovec) { .iov_base = helper_pid_out,
|
|
.iov_len = sizeof(*helper_pid_out) });
|
|
msg.msg_iov = &iov;
|
|
msg.msg_iovlen = 1;
|
|
msg.msg_control = buf;
|
|
msg.msg_controllen = sizeof(buf);
|
|
msg.msg_flags = 0;
|
|
|
|
n = recvmsg(fd, &msg, 0);
|
|
if(n < 0)
|
|
return(-errno);
|
|
|
|
else if(n != sizeof(iov.iov_len))
|
|
*helper_pid_out = -1;
|
|
|
|
cmsg = CMSG_FIRSTHDR(&msg);
|
|
if(cmsg == NULL){
|
|
printk("rcv_fd didn't receive anything, error = %d\n", errno);
|
|
return(-1);
|
|
}
|
|
if((cmsg->cmsg_level != SOL_SOCKET) ||
|
|
(cmsg->cmsg_type != SCM_RIGHTS)){
|
|
printk("rcv_fd didn't receive a descriptor\n");
|
|
return(-1);
|
|
}
|
|
|
|
new = ((int *) CMSG_DATA(cmsg))[0];
|
|
return(new);
|
|
}
|
|
|
|
int os_create_unix_socket(char *file, int len, int close_on_exec)
|
|
{
|
|
struct sockaddr_un addr;
|
|
int sock, err;
|
|
|
|
sock = socket(PF_UNIX, SOCK_DGRAM, 0);
|
|
if(sock < 0)
|
|
return -errno;
|
|
|
|
if(close_on_exec) {
|
|
err = os_set_exec_close(sock, 1);
|
|
if(err < 0)
|
|
printk("create_unix_socket : close_on_exec failed, "
|
|
"err = %d", -err);
|
|
}
|
|
|
|
addr.sun_family = AF_UNIX;
|
|
|
|
/* XXX Be more careful about overflow */
|
|
snprintf(addr.sun_path, len, "%s", file);
|
|
|
|
err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
|
|
if(err < 0)
|
|
return -errno;
|
|
|
|
return(sock);
|
|
}
|
|
|
|
void os_flush_stdout(void)
|
|
{
|
|
fflush(stdout);
|
|
}
|
|
|
|
int os_lock_file(int fd, int excl)
|
|
{
|
|
int type = excl ? F_WRLCK : F_RDLCK;
|
|
struct flock lock = ((struct flock) { .l_type = type,
|
|
.l_whence = SEEK_SET,
|
|
.l_start = 0,
|
|
.l_len = 0 } );
|
|
int err, save;
|
|
|
|
err = fcntl(fd, F_SETLK, &lock);
|
|
if(!err)
|
|
goto out;
|
|
|
|
save = -errno;
|
|
err = fcntl(fd, F_GETLK, &lock);
|
|
if(err){
|
|
err = -errno;
|
|
goto out;
|
|
}
|
|
|
|
printk("F_SETLK failed, file already locked by pid %d\n", lock.l_pid);
|
|
err = save;
|
|
out:
|
|
return(err);
|
|
}
|
|
|
|
/*
|
|
* Overrides for Emacs so that we follow Linus's tabbing style.
|
|
* Emacs will notice this stuff at the end of the file and automatically
|
|
* adjust the settings for this buffer only. This must remain at the end
|
|
* of the file.
|
|
* ---------------------------------------------------------------------------
|
|
* Local variables:
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|