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fexecve - execute program specified via file descriptor
int fexecve(int fd, char *const argv, char *const envp);
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
A successful call to fexecve() never returns. On error, the function
returns, with a result value of -1, and errno is set appropriately.
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
ENOSYS The /proc file system could not be accessed.
fexecve() is implemented since glibc 2.3.2.
POSIX.1-2008. This function is not specified in POSIX.1-2001, and is
not widely available on other systems.
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.
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