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Add change_attr_fd()

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Add change_attr_fd() function to modify the file/directory attribute.
This commit is contained in:
Goffredo Baroncelli 2015-03-16 20:33:49 +01:00 committed by Zbigniew Jędrzejewski-Szmek
parent 0ea37920e7
commit 5b9fbd354e
2 changed files with 23 additions and 0 deletions
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22
src/shared/util.c
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@ -7843,6 +7843,28 @@ int chattr_path(const char *p, bool b, unsigned mask) {
return chattr_fd(fd, b, mask);
}
int change_attr_fd(int fd, unsigned value, unsigned mask) {
unsigned old_attr, new_attr;
assert(fd >= 0);
if (mask == 0)
return 0;
if (ioctl(fd, FS_IOC_GETFLAGS, &old_attr) < 0)
return -errno;
new_attr = (old_attr & ~mask) |(value & mask);
if (new_attr == old_attr)
return 0;
if (ioctl(fd, FS_IOC_SETFLAGS, &new_attr) < 0)
return -errno;
return 0;
}
int read_attr_fd(int fd, unsigned *ret) {
assert(fd >= 0);

1
src/shared/util.h
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@ -1053,6 +1053,7 @@ int same_fd(int a, int b);
int chattr_fd(int fd, bool b, unsigned mask);
int chattr_path(const char *p, bool b, unsigned mask);
int change_attr_fd(int fd, unsigned value, unsigned mask);
int read_attr_fd(int fd, unsigned *ret);
int read_attr_path(const char *p, unsigned *ret);