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Linux Programmer's Manual (3)
fexecve - execute program specified via file descriptor
int fexecve(int fd, char *const argv, char *const envp);
Feature Test Macro Requirements for glibc (see
- Since glibc 2.10:
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
- Before glibc 2.10:
performs the same task as
with the difference that the file to be executed
is specified via a file descriptor,
rather than via a pathname.
The file descriptor
must be opened read-only,
and the caller must have permission to execute the file that it refers to.
A successful call to
On error, the function does return, with a result value of -1, and
is set appropriately.
Errors are as for
with the following additions:
is not a valid file descriptor, or
is NULL, or
filesystem could not be accessed.
is implemented since glibc 2.3.2.
This function is not specified in POSIX.1-2001,
and is not widely available on other systems.
It is specified in POSIX.1-2008.
is implemented using the
needs to be mounted and available at the time of the call.
is a file descriptor that refers to an interpreter script
and has been marked as close-on-exec (see the discussion of the
will fail to execute the script, since,
by the time the script interpreter tries to access the script file,
has already been closed.
The idea behind
is to allow the caller to verify (checksum) the contents of
an executable before executing it.
Simply opening the file, checksumming the contents, and then doing an
would not suffice, since, between the two steps, the filename,
or a directory prefix of the pathname, could have been exchanged
(by, for example, modifying the target of a symbolic link).
does not mitigate the problem that the
of a file could be changed between the checksumming and the call to
for that, the solution is to ensure that the permissions on the file
prevent it from being modified by malicious users.
This page is part of release 3.66 of the Linux
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
- RETURN VALUE
- CONFORMING TO
- SEE ALSO
This document was created by
using the manual pages.
Time: 21:43:00 GMT, July 12, 2014