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Diffstat (limited to 'arch/um/os-Linux/file.c')
-rw-r--r--arch/um/os-Linux/file.c288
1 files changed, 138 insertions, 150 deletions
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index b542a3a021b..b5afcfd0f86 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
@@ -8,18 +8,16 @@
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/socket.h>
-#include <sys/un.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
-#include <sys/uio.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/un.h>
+#include "kern_constants.h"
#include "os.h"
#include "user.h"
-#include "kern_util.h"
-static void copy_stat(struct uml_stat *dst, struct stat64 *src)
+static void copy_stat(struct uml_stat *dst, const struct stat64 *src)
{
*dst = ((struct uml_stat) {
.ust_dev = src->st_dev, /* device */
@@ -43,10 +41,10 @@ int os_stat_fd(const int fd, struct uml_stat *ubuf)
int err;
CATCH_EINTR(err = fstat64(fd, &sbuf));
- if(err < 0)
+ if (err < 0)
return -errno;
- if(ubuf != NULL)
+ if (ubuf != NULL)
copy_stat(ubuf, &sbuf);
return err;
}
@@ -56,27 +54,26 @@ int os_stat_file(const char *file_name, struct uml_stat *ubuf)
struct stat64 sbuf;
int err;
- do {
- err = stat64(file_name, &sbuf);
- } while((err < 0) && (errno == EINTR)) ;
-
- if(err < 0)
+ CATCH_EINTR(err = stat64(file_name, &sbuf));
+ if (err < 0)
return -errno;
- if(ubuf != NULL)
+ if (ubuf != NULL)
copy_stat(ubuf, &sbuf);
return err;
}
-int os_access(const char* file, int mode)
+int os_access(const char *file, int mode)
{
int amode, err;
- amode=(mode&OS_ACC_R_OK ? R_OK : 0) | (mode&OS_ACC_W_OK ? W_OK : 0) |
- (mode&OS_ACC_X_OK ? X_OK : 0) | (mode&OS_ACC_F_OK ? F_OK : 0) ;
+ amode = (mode & OS_ACC_R_OK ? R_OK : 0) |
+ (mode & OS_ACC_W_OK ? W_OK : 0) |
+ (mode & OS_ACC_X_OK ? X_OK : 0) |
+ (mode & OS_ACC_F_OK ? F_OK : 0);
err = access(file, amode);
- if(err < 0)
+ if (err < 0)
return -errno;
return 0;
@@ -88,7 +85,7 @@ int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
int err;
err = ioctl(fd, cmd, arg);
- if(err < 0)
+ if (err < 0)
return -errno;
return err;
@@ -97,7 +94,7 @@ int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
/* FIXME: ensure namebuf in os_get_if_name is big enough */
int os_get_ifname(int fd, char* namebuf)
{
- if(ioctl(fd, SIOCGIFNAME, namebuf) < 0)
+ if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
return -errno;
return 0;
@@ -108,37 +105,22 @@ int os_set_slip(int fd)
int disc, sencap;
disc = N_SLIP;
- if(ioctl(fd, TIOCSETD, &disc) < 0)
+ if (ioctl(fd, TIOCSETD, &disc) < 0)
return -errno;
sencap = 0;
- if(ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
+ if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
return -errno;
return 0;
}
-int os_set_owner(int fd, int pid)
-{
- if(fcntl(fd, F_SETOWN, pid) < 0){
- int save_errno = errno;
-
- if(fcntl(fd, F_GETOWN, 0) != pid)
- return -save_errno;
- }
-
- return 0;
-}
-
int os_mode_fd(int fd, int mode)
{
int err;
- do {
- err = fchmod(fd, mode);
- } while((err < 0) && (errno==EINTR)) ;
-
- if(err < 0)
+ CATCH_EINTR(err = fchmod(fd, mode));
+ if (err < 0)
return -errno;
return 0;
@@ -150,64 +132,73 @@ int os_file_type(char *file)
int err;
err = os_stat_file(file, &buf);
- if(err < 0)
+ if (err < 0)
return err;
- if(S_ISDIR(buf.ust_mode))
+ if (S_ISDIR(buf.ust_mode))
return OS_TYPE_DIR;
- else if(S_ISLNK(buf.ust_mode))
+ else if (S_ISLNK(buf.ust_mode))
return OS_TYPE_SYMLINK;
- else if(S_ISCHR(buf.ust_mode))
+ else if (S_ISCHR(buf.ust_mode))
return OS_TYPE_CHARDEV;
- else if(S_ISBLK(buf.ust_mode))
+ else if (S_ISBLK(buf.ust_mode))
return OS_TYPE_BLOCKDEV;
- else if(S_ISFIFO(buf.ust_mode))
+ else if (S_ISFIFO(buf.ust_mode))
return OS_TYPE_FIFO;
- else if(S_ISSOCK(buf.ust_mode))
+ else if (S_ISSOCK(buf.ust_mode))
return OS_TYPE_SOCK;
else return OS_TYPE_FILE;
}
-int os_file_mode(char *file, struct openflags *mode_out)
+int os_file_mode(const char *file, struct openflags *mode_out)
{
int err;
*mode_out = OPENFLAGS();
err = access(file, W_OK);
- if(err && (errno != EACCES))
+ if (err && (errno != EACCES))
return -errno;
- else if(!err)
+ else if (!err)
*mode_out = of_write(*mode_out);
err = access(file, R_OK);
- if(err && (errno != EACCES))
+ if (err && (errno != EACCES))
return -errno;
- else if(!err)
+ else if (!err)
*mode_out = of_read(*mode_out);
return err;
}
-int os_open_file(char *file, struct openflags flags, int mode)
+int os_open_file(const char *file, struct openflags flags, int mode)
{
int fd, err, f = 0;
- if(flags.r && flags.w) f = O_RDWR;
- else if(flags.r) f = O_RDONLY;
- else if(flags.w) f = O_WRONLY;
+ if (flags.r && flags.w)
+ f = O_RDWR;
+ else if (flags.r)
+ f = O_RDONLY;
+ else if (flags.w)
+ f = O_WRONLY;
else f = 0;
- if(flags.s) f |= O_SYNC;
- if(flags.c) f |= O_CREAT;
- if(flags.t) f |= O_TRUNC;
- if(flags.e) f |= O_EXCL;
+ if (flags.s)
+ f |= O_SYNC;
+ if (flags.c)
+ f |= O_CREAT;
+ if (flags.t)
+ f |= O_TRUNC;
+ if (flags.e)
+ f |= O_EXCL;
+ if (flags.a)
+ f |= O_APPEND;
fd = open64(file, f, mode);
- if(fd < 0)
+ if (fd < 0)
return -errno;
- if(flags.cl && fcntl(fd, F_SETFD, 1)){
+ if (flags.cl && fcntl(fd, F_SETFD, 1)) {
err = -errno;
close(fd);
return err;
@@ -216,7 +207,7 @@ int os_open_file(char *file, struct openflags flags, int mode)
return fd;
}
-int os_connect_socket(char *name)
+int os_connect_socket(const char *name)
{
struct sockaddr_un sock;
int fd, err;
@@ -225,13 +216,13 @@ int os_connect_socket(char *name)
snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
fd = socket(AF_UNIX, SOCK_STREAM, 0);
- if(fd < 0) {
+ if (fd < 0) {
err = -errno;
goto out;
}
err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
- if(err) {
+ if (err) {
err = -errno;
goto out_close;
}
@@ -254,7 +245,7 @@ int os_seek_file(int fd, unsigned long long offset)
unsigned long long actual;
actual = lseek64(fd, offset, SEEK_SET);
- if(actual != offset)
+ if (actual != offset)
return -errno;
return 0;
}
@@ -263,7 +254,7 @@ int os_read_file(int fd, void *buf, int len)
{
int n = read(fd, buf, len);
- if(n < 0)
+ if (n < 0)
return -errno;
return n;
}
@@ -272,37 +263,38 @@ int os_write_file(int fd, const void *buf, int len)
{
int n = write(fd, (void *) buf, len);
- if(n < 0)
+ if (n < 0)
return -errno;
return n;
}
-int os_file_size(char *file, unsigned long long *size_out)
+int os_file_size(const char *file, unsigned long long *size_out)
{
struct uml_stat buf;
int err;
err = os_stat_file(file, &buf);
- if(err < 0){
- printk("Couldn't stat \"%s\" : err = %d\n", file, -err);
+ if (err < 0) {
+ printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
+ -err);
return err;
}
- if(S_ISBLK(buf.ust_mode)){
+ if (S_ISBLK(buf.ust_mode)) {
int fd;
long blocks;
fd = open(file, O_RDONLY, 0);
- if(fd < 0) {
+ if (fd < 0) {
err = -errno;
- printk("Couldn't open \"%s\", errno = %d\n", file,
- errno);
+ printk(UM_KERN_ERR "Couldn't open \"%s\", "
+ "errno = %d\n", file, errno);
return err;
}
- if(ioctl(fd, BLKGETSIZE, &blocks) < 0){
+ if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
err = -errno;
- printk("Couldn't get the block size of \"%s\", "
- "errno = %d\n", file, errno);
+ printk(UM_KERN_ERR "Couldn't get the block size of "
+ "\"%s\", errno = %d\n", file, errno);
close(fd);
return err;
}
@@ -314,14 +306,15 @@ int os_file_size(char *file, unsigned long long *size_out)
return 0;
}
-int os_file_modtime(char *file, unsigned long *modtime)
+int os_file_modtime(const char *file, unsigned long *modtime)
{
struct uml_stat buf;
int err;
err = os_stat_file(file, &buf);
- if(err < 0){
- printk("Couldn't stat \"%s\" : err = %d\n", file, -err);
+ if (err < 0) {
+ printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
+ -err);
return err;
}
@@ -329,26 +322,13 @@ int os_file_modtime(char *file, unsigned long *modtime)
return 0;
}
-int os_get_exec_close(int fd, int *close_on_exec)
-{
- int ret;
-
- CATCH_EINTR(ret = fcntl(fd, F_GETFD));
-
- if(ret < 0)
- return -errno;
-
- *close_on_exec = (ret & FD_CLOEXEC) ? 1 : 0;
- return ret;
-}
-
int os_set_exec_close(int fd)
{
int err;
CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC));
- if(err < 0)
+ if (err < 0)
return -errno;
return err;
}
@@ -358,53 +338,51 @@ int os_pipe(int *fds, int stream, int close_on_exec)
int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
err = socketpair(AF_UNIX, type, 0, fds);
- if(err < 0)
+ if (err < 0)
return -errno;
- if(!close_on_exec)
+ if (!close_on_exec)
return 0;
err = os_set_exec_close(fds[0]);
- if(err < 0)
+ if (err < 0)
goto error;
err = os_set_exec_close(fds[1]);
- if(err < 0)
+ if (err < 0)
goto error;
return 0;
error:
- printk("os_pipe : Setting FD_CLOEXEC failed, err = %d\n", -err);
+ printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n",
+ -err);
close(fds[1]);
close(fds[0]);
return err;
}
-int os_set_fd_async(int fd, int owner)
+int os_set_fd_async(int fd)
{
- int err;
+ int err, flags;
- /* XXX This should do F_GETFL first */
- if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){
+ flags = fcntl(fd, F_GETFL);
+ if (flags < 0)
+ return -errno;
+
+ flags |= O_ASYNC | O_NONBLOCK;
+ if (fcntl(fd, F_SETFL, flags) < 0) {
err = -errno;
- printk("os_set_fd_async : failed to set O_ASYNC and "
- "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
+ printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC "
+ "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
return err;
}
-#ifdef notdef
- if(fcntl(fd, F_SETFD, 1) < 0){
- printk("os_set_fd_async : Setting FD_CLOEXEC failed, "
- "errno = %d\n", errno);
- }
-#endif
- if((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
- (fcntl(fd, F_SETOWN, owner) < 0)){
+ if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
+ (fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
err = -errno;
- printk("os_set_fd_async : Failed to fcntl F_SETOWN "
- "(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd,
- owner, errno);
+ printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN "
+ "(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
return err;
}
@@ -413,10 +391,14 @@ int os_set_fd_async(int fd, int owner)
int os_clear_fd_async(int fd)
{
- int flags = fcntl(fd, F_GETFL);
+ int flags;
+
+ flags = fcntl(fd, F_GETFL);
+ if (flags < 0)
+ return -errno;
flags &= ~(O_ASYNC | O_NONBLOCK);
- if(fcntl(fd, F_SETFL, flags) < 0)
+ if (fcntl(fd, F_SETFL, flags) < 0)
return -errno;
return 0;
}
@@ -426,11 +408,15 @@ int os_set_fd_block(int fd, int blocking)
int flags;
flags = fcntl(fd, F_GETFL);
+ if (flags < 0)
+ return -errno;
- if(blocking) flags &= ~O_NONBLOCK;
- else flags |= O_NONBLOCK;
+ if (blocking)
+ flags &= ~O_NONBLOCK;
+ else
+ flags |= O_NONBLOCK;
- if(fcntl(fd, F_SETFL, flags) < 0)
+ if (fcntl(fd, F_SETFL, flags) < 0)
return -errno;
return 0;
@@ -441,7 +427,7 @@ int os_accept_connection(int fd)
int new;
new = accept(fd, NULL, 0);
- if(new < 0)
+ if (new < 0)
return -errno;
return new;
}
@@ -462,15 +448,17 @@ 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");
+ if (r && w)
+ what = SHUT_RDWR;
+ else if (r)
+ what = SHUT_RD;
+ else if (w)
+ what = SHUT_WR;
+ else
return -EINVAL;
- }
+
err = shutdown(fd, what);
- if(err < 0)
+ if (err < 0)
return -errno;
return 0;
}
@@ -494,20 +482,20 @@ int os_rcv_fd(int fd, int *helper_pid_out)
msg.msg_flags = 0;
n = recvmsg(fd, &msg, 0);
- if(n < 0)
+ if (n < 0)
return -errno;
-
- else if(n != sizeof(iov.iov_len))
+ else if (n != 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);
+ if (cmsg == NULL) {
+ printk(UM_KERN_ERR "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");
+ if ((cmsg->cmsg_level != SOL_SOCKET) ||
+ (cmsg->cmsg_type != SCM_RIGHTS)) {
+ printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n");
return -1;
}
@@ -515,29 +503,28 @@ int os_rcv_fd(int fd, int *helper_pid_out)
return new;
}
-int os_create_unix_socket(char *file, int len, int close_on_exec)
+int os_create_unix_socket(const 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)
+ if (sock < 0)
return -errno;
- if(close_on_exec) {
+ if (close_on_exec) {
err = os_set_exec_close(sock);
- if(err < 0)
- printk("create_unix_socket : close_on_exec failed, "
- "err = %d", -err);
+ if (err < 0)
+ printk(UM_KERN_ERR "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)
+ if (err < 0)
return -errno;
return sock;
@@ -558,17 +545,18 @@ int os_lock_file(int fd, int excl)
int err, save;
err = fcntl(fd, F_SETLK, &lock);
- if(!err)
+ if (!err)
goto out;
save = -errno;
err = fcntl(fd, F_GETLK, &lock);
- if(err){
+ if (err) {
err = -errno;
goto out;
}
- printk("F_SETLK failed, file already locked by pid %d\n", lock.l_pid);
+ printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n",
+ lock.l_pid);
err = save;
out:
return err;
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-16 03:12:56 +0000