Amazing no one else has written this... Someone with an intel mac
should test this to check the uint32_t works there too (I have a
powerpc).
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/attr.h> /* !!! */
#include <sys/stat.h>
#include <unistd.h>
int my_lchmod(const char *path, mode_t mode) {
struct attrlist attrList;
uint32_t m;
/* manpage is wrong! not mode_t, but uint32_t is required */
memset(&attrList, 0, sizeof(attrList));
attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
attrList.commonattr = ATTR_CMN_ACCESSMASK;
m = mode;
return setattrlist(path, &attrList, &m, sizeof(m),
FSOPT_NOFOLLOW);
}
int main(int argc, const char **argv) {
struct stat st;
const char *file;
int perms;
file = argv[1];
perms = strtol(argv[2], 0, 0);
if (lstat(file, &st) != 0) {
perror("stat");
return 1;
}
st.st_mode = (st.st_mode & ~0777) | perms;
if (my_lchmod(file, st.st_mode) != 0) {
perror("lchmod");
return 1;
}
return 0;
}