SYNOPSIS
       #define _GNU_SOURCE
       #include <unistd.h>

       int fexecve(int fd, char *const argv[], char *const envp[]);

DESCRIPTION
       fexecve() performs the same task as execve(2), with the difference that
       the file to be executed is specified via a file descriptor, fd,  rather
       than  via a pathname.  The file descriptor fd must be opened read-only,
       and the caller must have permission to execute the file that it  refers
       to.

RETURN VALUE
       A  successful  call to fexecve() never returns.  On error, the function
       returns, with a result value of -1, and errno is set appropriately.

ERRORS
       errors are as for execve(2), with the following additions:

       EINVAL fd is not a valid file descriptor, or argv is NULL, or  envp  is
              NULL.

       ENOSYS The /proc file system could not be accessed.

VERSIONS
       fexecve() is implemented since glibc 2.3.2.

CONFORMING TO
       POSIX.1-2008.   This  function is not specified in POSIX.1-2001, and is
       not widely available on other systems.

NOTES
       on linux, fexecve() is implemented using the proc(5)  file  system,  so
       /proc needs to be mounted and available at the time of the call.

SEE ALSO
       execve(2)

COLOPHON
       This  page  is  part of release 3.23 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.