execve to execute a program

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Filesystem 1024-blocks Free %Used Iused %Iused Mounted on /dev/hd4 32768 16016 52% 2271 14% / /dev/hd2 4587520 1889420 59% 37791 4% /usr /dev/hd9var 65536 12032 82% 518 4% /var /dev/hd3 819200 637832 ...

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fexecve

FEXECVE(3)						     Linux Programmer's Manual							FEXECVE(3)

NAME

       fexecve - execute program specified via file descriptor

SYNOPSIS

       #include <unistd.h>

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

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       fexecve():
	   Since glibc 2.10:
	       _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
	   Before glibc 2.10:
	       _GNU_SOURCE

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 3.44 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/.

Linux								    2010-09-15								FEXECVE(3)

Programming