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libposix: drafted chmod/fchmod; TODO: configurable AT_FDCWD

This commit is contained in:
Giacomo Tesio 2017-08-23 01:05:54 +02:00
parent 6a94e587a6
commit 4455658796
1 changed files with 87 additions and 7 deletions
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94
sys/src/lib/posix/files.c
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@ -332,8 +332,7 @@ POSIX_fstat(int *errnop, int file, void *pstat)
}
OnIgnoredSignalInterrupt:
d = dirfstat(file);
if(d == nil)
{
if(d == nil){
if(__libposix_restart_syscall())
goto OnIgnoredSignalInterrupt;
*errnop = __libposix_translate_errstr((uintptr_t)POSIX_fstat);
@ -361,8 +360,7 @@ POSIX_stat(int *errnop, const char *file, void *pstat)
return -1;
}
d = dirstat(file);
if(d == nil)
{
if(d == nil){
*errnop = __libposix_translate_errstr((uintptr_t)POSIX_stat);
return -1;
}
@ -377,21 +375,103 @@ POSIX_stat(int *errnop, const char *file, void *pstat)
int
POSIX_chmod(int *errnop, const char *path, int mode)
{
Dir *dir, ndir;
long cperm = 0;
PosixError e;
e = __libposix_open_translation(0, mode, nil, &cperm);
if(e != 0){
*errnop = __libposix_get_errno(e);
if(path == nil)
e = PosixENOENT;
else
e = __libposix_open_translation(0, mode, nil, &cperm);
if(e != 0)
goto FailWithError;
dir = dirstat(path);
if(dir == nil){
e = PosixENOENT;
goto FailWithError;
}
nulldir(&ndir);
ndir.mode = (dir->mode & ~(0777)) | (cperm & 0777);
free(dir);
if(dirwstat(path, &ndir) < 0){
*errnop = __libposix_translate_errstr((uintptr_t)POSIX_chmod);
return -1;
}
return 0;
FailWithError:
*errnop = __libposix_get_errno(e);
return -1;
}
int
POSIX_fchmodat(int *errnop, int fd, const char *path, long mode, int flag)
{
#define AT_FDCWD -100 /* from NetBSD; TODO: get from configuration */
Dir *dir, ndir;
long cperm = 0;
char fullpath[4096], *p;
int l;
PosixError e;
if(fd == AT_FDCWD){
return POSIX_chmod(errnop, path, mode);
} else if(path == nil){
e = PosixENOENT;
} else if(strlen(path) > sizeof(fullpath)-100){
e = PosixENAMETOOLONG;
} else if(path[0] == '/'){
if(fd < 0)
e = PosixEBADF;
else {
dir = dirfstat(fd);
if(dir == nil){
e = PosixEBADF;
} else {
if((dir->mode & DMDIR) == 0)
e = PosixENOTDIR;
free(dir);
}
}
} else {
e = __libposix_open_translation(0, mode, nil, &cperm);
}
if(e == 0 && fd2path(fd, fullpath, sizeof(fullpath)-2) != 0)
e = PosixEBADF;
if(e != 0)
goto FailWithError;
l = strlen(fullpath);
fullpath[l++] = '/';
p = fullpath + l;
l = strlen(path);
if(l > sizeof(fullpath) - (p - fullpath) - 1){
e = PosixENAMETOOLONG;
goto FailWithError;
}
strncpy(p, path, strlen(path)+1);
cleanname(fullpath);
dir = dirstat(path);
if(dir == nil){
e = PosixENOENT;
goto FailWithError;
}
nulldir(&ndir);
ndir.mode = (dir->mode & ~(0777)) | (cperm & 0777);
free(dir);
if(dirwstat(path, &ndir) < 0){
*errnop = __libposix_translate_errstr((uintptr_t)POSIX_chmod);
return -1;
}
return 0;
FailWithError:
*errnop = __libposix_get_errno(e);
return -1;
}