.\" 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
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.\" 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
.\"
.\" Japanese Version Copyright (c) 1998 Masato Taruishi
.\"         all rights reserved.
.\" Translated Mon May 27 16:58:39 JST 1998
.\"         by Masato Taruishi
.\" Modified Sun Aug 08 1998 by Fujiwara Teruyoshi <fujiwara@linux.or.jp>
.\" Modified Fri Oct  6 2000 by Kentaro Shirakata <argrath@ub32.org>
.\"
.\"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
.TH EXEC 3  "29 November 1993" "BSD MANPAGE" "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
.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 
ؿ
.B exec
եߥ꡼ϸߤΥץ᡼򿷤ץ᡼֤
롣Υޥ˥奢Ƥؿ
.BR execve (2)
ΥեȥɤǤ롣
(ߤΥץִˤĤƤξܺ٤
.B execve
Υޥ˥奢򸫤)
.PP
δؿκǽΰϼ¹ԤեΥѥ̾Ǥ롣
.PP
ؿ
.BR execl ,
.BR execlp ,
.BR execle

.I "const char *arg"
Ȥ³
.IR arg0 ,
.IR arg1 ,
\&...,
.IR argn
Ȥƹͤ롣
ˤϼ¹ԤץѲǽʰΥꥹ(Ǹ夬
NULLǽ 1 İʾʸؤΥݥ)Ϳ롣
ǽΰϴˤꡢ¹Ԥե̾
ؤΥݥ󥿤ˤ롣ΥꥹȤɬ
.B NULL
ǽʤФʤʤ
.PP
ؿ
.B execv

.B execvp
ϿץѲǽʰꥹ(Ǹ夬NULLǽ 1 
ʾʸؤΥݥ󥿤)Ϳ롣
ǽΰϴˤ¹Ԥե̾
Υݥ󥿤ˤ롣ݥ󥿤ɬ
.B NULL
ǽʤФʤʤ
.PP
ؿ
.B execle
ǤϥץδĶꤹ롣Ķϰꥹ(ѥ᡼ꥹȤ⤷ɲäΥѥ᡼
äargvؤΥݥ)κǸ
.B NULL
³ƻꤹ롣
ɲäΥѥ᡼Ȥ
NULLǽʸؤΥݥ󥿤
Ǥ
.B NULL
ǽʤФʤʤ¾δؿϸߤΥץ
γѿ
.B environ
鿷ץѤδĶͿ롣

.PP
δؿΤĤ̤ʵˡäƤ롣
.PP
ؿ
.B execlp

.B execvp
Ϥ⤷ꤵ줿ե̾å(/)
ޤǤʤ硢ƱưǼ¹Բǽʥեõ롣
ѥϴĶѿ
.B PATH
ǻꤵ줿ѥǤ롣
⤷ѿꤵƤʤ硢ǥեPATHȤ``:/
bin:/usr/bin''Ȥ롣Υ顼
˰롣
.PP
⤷ե뤬¹ԥեǤʤ(ƤӽФȤ
.B execve

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

.BR EACCES
ꤷäƤ롣
.\" fujiwara: ĿŪˤϡפ(^_^;
.PP
եΥإå¹ԷȤǧǤʤ
(ƤӽФȤ
.B execve

.BR ENOEXEC
֤)δؿϤΥեǽΰȤ
¹Ԥ(λߤԤ硢ʾθϹԤ
)
.SH ֤
⤷
.B exec
եߥ꡼֤äƤ硢顼ȯƤ롣 ֤ͤ\-1
ǡѿ
.I errno
ˤΥ顼ƤåȤ롣
.SH ե
.I /bin/sh
.SH 顼
ƤδؿϼԤ礬롣ξ饤֥ؿ
.BR execve (2)
ˤäƻꤵ줿顼
.I errno
ꤹ롣
.SH Ϣ
.BR sh (1),
.BR execve (2),
.BR fork (2),
.BR environ (5),
.BR ptrace (2)
.SH ߴ
Linux ʳΥƥˤϡ
(Ķѿ \fBPATH\fR ƤʤȤ)
ǥեȤΥѥˤơߤκȥǥ쥯ȥ
(current working directory) 
.I /bin

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

.B execvp
ΤդޤŪʴ뤬Ū˵ܤƤ
餺 POSIX ɸǤƤʤBSD(ޤ餯¾
Υƥ)Ϥ⤷ ETXTBSY 缫ưŪǤ
Ԥ롣 Linux Ϥϡɥ顼ȤƼ갷¨¤֤ä
롣
.PP
Ūˡؿ
.B execlp

.B execvp
Ϥ 2 ĤδؿȤ֤
.B ENOMEM

.BR E2BIG
Ⱦ줿顼ƤΥ顼̵뤷Ƥ
ǤϾƤʤɤΤ褦ʥ顼ȯ
Ǥ֤äƤ褦ѹ줿
.SH 
.BR execl ,
.BR execv ,
.BR execle ,
.BR execlp ,
.B execvp

IEEE Std1003.1-88 (``POSIX.1'')
˽򤹤롣