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exec.3: Rewrite description of PATH and mention _CS_PATH 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2010-09-23 17:23:59 +02:00
parent c54ed37e0a
commit 76e2566b03
1 changed files with 14 additions and 7 deletions
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man3/exec.3
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@ -36,7 +36,7 @@
.\" Modified, 24 Jun 2004, Michael Kerrisk <mtk.manpages@gmail.com> .\" Modified, 24 Jun 2004, Michael Kerrisk <mtk.manpages@gmail.com>
.\" Added note on casting NULL .\" Added note on casting NULL
.\" .\"
.TH EXEC 3 2009-02-22 "GNU" "Linux Programmer's Manual" .TH EXEC 3 2010-09-23 "GNU" "Linux Programmer's Manual"
.SH NAME .SH NAME
execl, execlp, execle, execv, execvp \- execute a file execl, execlp, execle, execv, execvp \- execute a file
.SH SYNOPSIS .SH SYNOPSIS
@ -121,17 +121,24 @@ image from the external variable
in the current process. in the current process.
.SS Special semantics for execlp() and execvp() .SS Special semantics for execlp() and execvp()
.PP .PP
The functions The
.BR execlp () .BR execlp ()
and and
.BR execvp () .BR execvp ()
will duplicate the actions of the shell in searching for an executable file functions duplicate the actions of the shell in
searching for an executable file
if the specified filename does not contain a slash (/) character. if the specified filename does not contain a slash (/) character.
The search path is the path specified in the environment by the The file is sought in the colon-separated list of directory pathnames
specified in the
.B PATH .B PATH
variable. environment variable.
If this variable isn't specified, the default path If this variable isn't defined, the path list defaults to
":/bin:/usr/bin" is used. the current directory followed by the list of directories returned by
.IR confstr(_CS_PATH) .
(This
.BR confstr (3)
call typically returns the value "/bin:/usr/bin".)
In addition, certain In addition, certain
errors are treated specially. errors are treated specially.
.PP .PP