execve
Hurricane Electric Internet Services
NAME
execve - execute program
SYNOPSIS
#include <unistd.h>
int execve (const char *filename, const char *argv [],
const char *envp[]);
DESCRIPTION
execve() executes the program pointed to by filename.
filename must be either a binary executable, or a shell
script starting with a line of the form "#! interpreter
[arg]".
execve() does not return on success, and the text, data,
bss, and stack of the calling process are overwritten by
that of the program loaded. The program invoked inherits
the calling process's PID, and any open file descriptors
that are not set to close on exec. Signals pending on the
parent process are cleared.
If the current program is being ptraced, a SIGTRAP is sent
to it after a successful execve().
RETURN VALUE
On success, execve() does not return, on error -1 is
returned, and errno is set appropriately.
ERRORS
EACCES The file is not a regular file.
EACCES Execute permission is denied for the file.
EPERM The file system is mounted noexec.
EPERM The file system is mounted nosuid and the file has
an SUID or SGID bit set.
E2BIG The argument list is too big.
ENOEXEC
The magic number in the file is incorrect.
EFAULT filename points outside your accessible address
space.
ENAMETOOLONG
filename is too long.
ENOENT The file does not exist.
ENOMEM Insufficient kernel memory was available.
ENOTDIR
A component of the path prefix is not a directory.
EACCES Search permission is denied on a component of the
path prefix.
ELOOP filename contains a circular reference (i.e., via a
symbolic link)
CONFORMING TO
SVID, AT&T, POSIX, X/OPEN, BSD 4.3
NOTES
SUID and SGID processes can not be ptrace()'d SUID or
SGID.
A maximum line length of 127 characters is allowed for the
first line in a #! executable shell script. This may be
circumvented by changing the max size of buf, in which
case you will become bound by the 1024 byte size of a
buffer, which is not easily worked around.
SEE ALSO
execl(3), fork(2)
Hurricane Electric Internet Services
Copyright (C) 1998
Hurricane Electric.
All Rights Reserved.