.\" Copyright (c) 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\"     @(#)exec.3	6.4 (Berkeley) 4/19/91
.\"
.\" Converted for Linux, Mon Nov 29 11:12:48 1993, faith@cs.unc.edu
.\" Updated more for Linux, Tue Jul 15 11:54:18 1997, pacman@cqc.com
.\" Modified, 24 Jun 2004, Michael Kerrisk <mtk.manpages@gmail.com>
.\"     Added note on casting NULL
.\"
.\" Japanese Version Copyright (c) 1998 Masato Taruishi
.\"         all rights reserved.
.\" Translated 1998-05-27, Masato Taruishi
.\" Modified 1998-08-08, Fujiwara Teruyoshi <fujiwara@linux.or.jp>
.\" Modified 2000-10-06, Kentaro Shirakata <argrath@ub32.org>
.\" Modified 2005-02-26, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.\"WORD:        null-terminated strings    NULLǽʸ
.\"WORD:        anti-Trojan-horse measure  ȥк
.\"WORD:	external variable          ѿ
.\"WORD:        current  directory first   ȥǥ쥯ȥ꤬ǽ
.\"WORD:        the attempted execve       ƤӽФȤexecve
.\"WORD:        variadic function          Ĺؿ
.\"WORD:        semantics                  (ץ)ư
.\"
.TH EXEC 3  1993-11-29 "GNU" "Linux Programmer's Manual"
.SH ̾
execl, execlp, execle, execv, execvp \- ե¹Ԥ
.SH 
.B #include <unistd.h>
.sp
.B extern char **environ;
.sp
.BI "int execl(const char *" path ", const char *" arg ", ...);"
.br
.BI "int execlp(const char *" file ", const char *" arg ", ...);"
.br
.BI "int execle(const char *" path ", const char *" arg ,
.br
.BI "           ..., char * const " envp "[]);"
.br
.BI "int execv(const char *" path ", char *const " argv "[]);"
.br
.BI "int execvp(const char *" file ", char *const " argv "[]);"
.SH 
.BR exec ()
եߥ꡼δؿϸߤΥץ᡼򿷤ץ᡼֤
롣Υޥ˥奢Ƥؿ
.BR execve (2)
ΥեȥɤǤ롣
(ߤΥץ֤ˤĤƤξܺ٤
.BR execve (2)
Υޥ˥奢򻲾)
.PP
δؿκǽΰϡ¹ԤեΥѥ̾Ǥ롣
.PP
ؿ
.BR execl (),
.BR execlp (),
.BR execle ()

.I "const char *arg"
Ȥ³άʬ
.IR arg0 ,
.IR arg1 ,
\&...,
.I argn
Ȥߤʤ롣
ˤϡ¹ԤץѲǽʰΥꥹȤꤹ
(ΥꥹȤ NULL ǽü줿ʸؤΥݥ󥿤鹽)
Ȥơǽΰϡ¹Ԥե̾
ؤΥݥ󥿤ˤ롣ΥꥹȤɬ NULL
ǽʤФʤ餺δؿϲĹؿʤΤǡ
Υݥ󥿤
.B "(char *) NULL"
ȥ㥹ȤʤФʤʤ
.PP
ؿ
.BR execv ()

.BR execvp ()
ϡѲǽʰꥹ (NULL ǽü줿ʸؤ
ݥ󥿤) 򿷤ץϤ
Ȥơǽΰϼ¹Ԥե̾
Υݥ󥿤ˤ롣ݥ󥿤ɬ
NULL ǽʤФʤʤ
.PP
ؿ
.BR execle ()
ǤϿץδĶꤹ롣
Ķϰꥹ (ѥ᡼ꥹȤ⤷ɲäΥѥ᡼
ä argv ؤΥݥ) κǸ
NULL ݥ󥿤³ƻꤹ롣
ɲäΥѥ᡼ϡ
NULL ǽü줿ʸؤΥݥ󥿤Ǥꡢ
NULL ݥ󥿤ǽʤФʤʤ
¾δؿǤϡߤΥץγѿ
.B environ
鿷ץѤδĶͿ롣
.SS execlp()  execvp() ̤ư
.PP
ؿ
.BR execlp ()

.BR execvp ()
ϡꤵ줿ե̾å (/) ޤǤʤ硢
ƱưǼ¹Բǽʥեõ롣
ѥϴĶѿ
.B PATH
ǻꤵ줿ѥǤ롣
ѿꤵƤʤ硢ǥեPATHȤ
":/bin:/usr/bin" Ѥ롣
ޤĤΥ顼ȯΰüǤ롣
.PP
⤷ե뤬¹ԥեǤʤ (ΤȤƤӽФȤ
.BR execve (2)

.B EACCES
֤)δؿϻĤθѥθ³롣
¾˥ե뤬Ĥʤʤä祰Хѿ
.I errno

.B EACCES
ꤷ롣
.\" fujiwara: ĿŪˤϡפ(^_^;
.PP
եΥإå¹ԷȤǧǤʤ
(ΤȤƤӽФȤ
.BR execve (2)

.B ENOEXEC
֤)δؿϤΥեǽΰȤ
.RI ( /bin/sh )
¹Ԥ (ˤ⼺Ԥ硢ʾθϹԤʤ)
.SH ֤
⤷
.BR exec ()
եߥ꡼Ƥ硢顼ȯƤ롣
֤ͤ \-1 ǡѿ
.I errno
ˤΥ顼ƤåȤ롣
.SH 顼
ƤδؿϼԤ礬롣ξ饤֥ؿ
.BR execve (2)
ˤäƻꤵ줿顼
.I errno
ꤹ롣
.SH 
POSIX.1-2001.
.SH 
Linux ʳΥƥˤϡ
(Ķѿ \fBPATH\fR ƤʤȤ)
ǥեȤΥѥˤơȡǥ쥯ȥ꤬
.I /bin

.I /usr/bin
θ֤Τ⤢롣
ϥȥкΤǤ롣
Linux ǤϡǥեȤΥѥˡΤʤΡָߤΥǥ쥯ȥ
õפȤ롼ȤäƤ롣
.PP
ե¹Ԥ褦ȤƤ֤˥顼ȯ
.BR execlp ()

.BR execvp ()
ΤդޤˤĤŪʴϤ뤬ŪʸȤƵܤƤ餺
POSIX ɸǤ⵬ꤵƤʤBSD (ޤ餯¾Υƥ) Ǥϡ
.B ETXTBSY
ȯ硢ưŪ (sleep) ƻԤԤ
Linux Ϥϡɥ顼ȤƼ갷¨¤롣
.PP
Ūˡؿ
.BR execlp ()

.BR execvp ()
ϡ顼ȡ 2 ĤδؿȤ֤
.B ENOMEM

.B E2BIG
ʳƤΥ顼̵뤷Ƥ
ǤϡʳΥ顼ȯǤ⡢
֤äƤ褦ѹ줿
.SH Ϣ
.BR sh (1),
.BR execve (2),
.BR fork (2),
.BR ptrace (2),
.BR fexecve (3),
.BR environ (7)