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Implement AT_SYMLINK_FOLLOW and AT_SYMLINK_NOFOLLOW.

This commit is contained in:
Jonas 'Sortie' Termansen 2013-11-16 13:21:44 +01:00
parent 2311d634ac
commit eb831479fb
1 changed files with 25 additions and 17 deletions
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42
sortix/io.cpp
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@ -186,8 +186,8 @@ static int sys_open(const char* path, int flags, mode_t mode)
// TODO: This is a hack! Stat the file in some manner and check permissions.
static int sys_faccessat(int dirfd, const char* path, int /*mode*/, int flags)
{
if ( flags )
return errno = ENOSYS, -1;
if ( flags & (AT_SYMLINK_NOFOLLOW) )
return errno = EINVAL, -1;
char* pathcopy = GetStringFromUser(path);
if ( !pathcopy )
return -1;
@ -195,7 +195,8 @@ static int sys_faccessat(int dirfd, const char* path, int /*mode*/, int flags)
const char* relpath = pathcopy;
Ref<Descriptor> from = PrepareLookup(&relpath, dirfd);
if ( !from ) { delete[] pathcopy; return -1; }
Ref<Descriptor> desc = from->open(&ctx, relpath, O_READ);
int open_flags = O_READ | (flags & AT_SYMLINK_NOFOLLOW ? O_SYMLINK_NOFOLLOW : 0);
Ref<Descriptor> desc = from->open(&ctx, relpath, open_flags);
delete[] pathcopy;
return desc ? 0 : -1;
}
@ -289,8 +290,10 @@ static int sys_ftruncate(int fd, off_t length)
return desc->truncate(&ctx, length);
}
static int sys_fstatat(int dirfd, const char* path, struct stat* st, int /*flags*/)
static int sys_fstatat(int dirfd, const char* path, struct stat* st, int flags)
{
if ( flags & ~(AT_SYMLINK_NOFOLLOW) )
return errno = EINVAL;
char* pathcopy = GetStringFromUser(path);
if ( !pathcopy )
return -1;
@ -298,7 +301,8 @@ static int sys_fstatat(int dirfd, const char* path, struct stat* st, int /*flags
const char* relpath = pathcopy;
Ref<Descriptor> from = PrepareLookup(&relpath, dirfd);
if ( !from ) { delete[] pathcopy; return -1; }
Ref<Descriptor> desc = from->open(&ctx, relpath, O_READ);
int open_flags = O_READ | (flags & AT_SYMLINK_NOFOLLOW ? O_SYMLINK_NOFOLLOW : 0);
Ref<Descriptor> desc = from->open(&ctx, relpath, open_flags);
delete[] pathcopy;
if ( !desc )
return -1;
@ -451,8 +455,8 @@ static int sys_fchown(int fd, uid_t owner, gid_t group)
static int sys_fchownat(int dirfd, const char* path, uid_t owner, gid_t group, int flags)
{
if ( flags )
return errno = ENOTSUP, -1;
if ( flags & ~(AT_SYMLINK_NOFOLLOW) )
return errno = EINVAL, -1;
char* pathcopy = GetStringFromUser(path);
if ( !pathcopy )
return -1;
@ -460,7 +464,8 @@ static int sys_fchownat(int dirfd, const char* path, uid_t owner, gid_t group, i
const char* relpath = pathcopy;
Ref<Descriptor> from = PrepareLookup(&relpath, dirfd);
if ( !from ) { delete[] pathcopy; return -1; }
Ref<Descriptor> desc = from->open(&ctx, relpath, O_WRITE);
int open_flags = O_WRITE | (flags & AT_SYMLINK_NOFOLLOW ? O_SYMLINK_NOFOLLOW : 0);
Ref<Descriptor> desc = from->open(&ctx, relpath, open_flags);
from.Reset();
delete[] pathcopy;
if ( !desc )
@ -485,8 +490,8 @@ static int sys_fchmod(int fd, mode_t mode)
static int sys_fchmodat(int dirfd, const char* path, mode_t mode, int flags)
{
if ( flags )
return errno = ENOTSUP, -1;
if ( flags & ~(AT_SYMLINK_NOFOLLOW) )
return errno = EINVAL, -1;
char* pathcopy = GetStringFromUser(path);
if ( !pathcopy )
return -1;
@ -494,7 +499,8 @@ static int sys_fchmodat(int dirfd, const char* path, mode_t mode, int flags)
const char* relpath = pathcopy;
Ref<Descriptor> from = PrepareLookup(&relpath, dirfd);
if ( !from ) { delete[] pathcopy; return -1; }
Ref<Descriptor> desc = from->open(&ctx, relpath, O_WRITE);
int open_flags = O_WRITE | (flags & AT_SYMLINK_NOFOLLOW ? O_SYMLINK_NOFOLLOW : 0);
Ref<Descriptor> desc = from->open(&ctx, relpath, open_flags);
from.Reset();
delete[] pathcopy;
if ( !desc )
@ -523,8 +529,8 @@ static int sys_futimens(int fd, const struct timespec user_times[2])
static int sys_utimensat(int dirfd, const char* path,
const struct timespec user_times[2], int flags)
{
if ( flags )
return errno = ENOTSUP, -1;
if ( flags & ~(AT_SYMLINK_NOFOLLOW) )
return errno = EINVAL, -1;
struct timespec times[2];
if ( !CopyFromUser(times, user_times, sizeof(times)) )
return -1;
@ -535,7 +541,8 @@ static int sys_utimensat(int dirfd, const char* path,
const char* relpath = pathcopy;
Ref<Descriptor> from = PrepareLookup(&relpath, dirfd);
if ( !from ) { delete[] pathcopy; return -1; }
Ref<Descriptor> desc = from->open(&ctx, relpath, O_WRITE);
int open_flags = O_WRITE | (flags & AT_SYMLINK_NOFOLLOW ? O_SYMLINK_NOFOLLOW : 0);
Ref<Descriptor> desc = from->open(&ctx, relpath, open_flags);
from.Reset();
delete[] pathcopy;
if ( !desc )
@ -547,8 +554,8 @@ static int sys_linkat(int olddirfd, const char* oldpath,
int newdirfd, const char* newpath,
int flags)
{
if ( flags )
return errno = ENOTSUP, -1;
if ( flags & ~(AT_SYMLINK_FOLLOW) )
return errno = EINVAL, -1;
ioctx_t ctx; SetupUserIOCtx(&ctx);
@ -572,7 +579,8 @@ static int sys_linkat(int olddirfd, const char* oldpath,
Ref<Descriptor> oldfrom = PrepareLookup(&oldrelpath, olddirfd);
if ( !oldfrom ) { delete[] oldpathcopy; delete[] final_elem; return -1; }
Ref<Descriptor> file = oldfrom->open(&ctx, oldrelpath, O_READ);
int open_flags = O_READ | (flags & AT_SYMLINK_FOLLOW ? 0 : O_SYMLINK_NOFOLLOW);
Ref<Descriptor> file = oldfrom->open(&ctx, oldrelpath, open_flags);
delete[] oldpathcopy;
if ( !file ) { delete[] final_elem; return -1; }