github.com/afumu/libc@v0.0.6/musl/src/stat/fchmod.c (about)

     1  #include <sys/stat.h>
     2  #include <errno.h>
     3  #include <fcntl.h>
     4  #include "syscall.h"
     5  
     6  int fchmod(int fd, mode_t mode)
     7  {
     8  	int ret = __syscall(SYS_fchmod, fd, mode);
     9  	if (ret != -EBADF || __syscall(SYS_fcntl, fd, F_GETFD) < 0)
    10  		return __syscall_ret(ret);
    11  
    12  	char buf[15+3*sizeof(int)];
    13  	__procfdname(buf, fd);
    14  #ifdef SYS_chmod
    15  	return syscall(SYS_chmod, buf, mode);
    16  #else
    17  	return syscall(SYS_fchmodat, AT_FDCWD, buf, mode);
    18  #endif
    19  }