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#define _GNU_SOURCE
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include "syscall.h"
void __procfdname(char *, unsigned);
int fexecve(int fd, char *const argv[], char *const envp[])
{
int r = __syscall(SYS_execveat, fd, "", argv, envp, AT_EMPTY_PATH);
if (r != -ENOSYS) return __syscall_ret(r);
char buf[15 + 3*sizeof(int)];
__procfdname(buf, fd);
execve(buf, argv, envp);
if (errno == ENOENT) errno = EBADF;
return -1;
}
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