+#define _GNU_SOURCE
#include <unistd.h>
-#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include "syscall.h"
int fexecve(int fd, char *const argv[], char *const envp[])
{
- static const char proc[] = "/proc/self/fd/%d";
- char buf[sizeof proc + 3*sizeof(int)];
- snprintf(buf, sizeof buf, proc, fd);
- return execve(buf, argv, 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;
}