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git://git.musl-libc.org/musl
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7edbcbeb76
instead, use the fstatat/stat functions, so that the logic for which syscalls are present and usable is all in fstatat. this results in a slight increase in cost for old kernels on 32-bit archs: now statx will be attempted first rather than just using the legacy time32 syscalls, despite us not caring about timestamps. however, it's not even clear that the legacy syscalls *should* succeed if the timestamps are out of range; arguably they should fail with EOVERFLOW. as such, paying a small cost here on old kernels seems well-motivated. with this change, fchmodat itself is no longer blocking ports to new archs that lack the legacy syscalls.
37 lines
874 B
C
37 lines
874 B
C
#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "syscall.h"
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int fchmodat(int fd, const char *path, mode_t mode, int flag)
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{
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if (!flag) return syscall(SYS_fchmodat, fd, path, mode, flag);
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if (flag != AT_SYMLINK_NOFOLLOW)
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return __syscall_ret(-EINVAL);
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struct stat st;
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int ret, fd2;
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char proc[15+3*sizeof(int)];
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if (fstatat(fd, path, &st, flag))
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return -1;
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if (S_ISLNK(st.st_mode))
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return __syscall_ret(-EOPNOTSUPP);
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if ((fd2 = __syscall(SYS_openat, fd, path, O_RDONLY|O_PATH|O_NOFOLLOW|O_NOCTTY|O_CLOEXEC)) < 0) {
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if (fd2 == -ELOOP)
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return __syscall_ret(-EOPNOTSUPP);
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return __syscall_ret(fd2);
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}
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__procfdname(proc, fd2);
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ret = stat(proc, &st);
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if (!ret) {
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if (S_ISLNK(st.st_mode)) ret = __syscall_ret(-EOPNOTSUPP);
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else ret = syscall(SYS_fchmodat, AT_FDCWD, proc, mode);
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}
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__syscall(SYS_close, fd2);
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return ret;
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}
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