'\" t
.\" Title: shadow
.\" Author: Julianne Frances Haugh
.\" Generator: DocBook XSL Stylesheets vsnapshot
.\" Date: 01/04/2024
.\" Manual: Library Calls
.\" Source: shadow-utils 4.15.1
.\" Language: French
.\"
.TH "SHADOW" "3" "01/04/2024" "shadow\-utils 4\&.15\&.1" "Library Calls"
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.\" * Define some portability stuff
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
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.\" * set default formatting
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.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
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.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NOM"
shadow, getspnam \- routines d\*(Aqutilisation des mots de passe cach\('es
.SH "SYNTAX"
.PP
\fI#include \fR
.PP
\fIstruct spwd *getspent();\fR
.PP
\fIstruct spwd *getspnam(char\fR
\fI*name\fR\fI);\fR
.PP
\fIvoid setspent();\fR
.PP
\fIvoid endspent();\fR
.PP
\fIstruct spwd *fgetspent(FILE\fR
\fI*fp\fR\fI);\fR
.PP
\fIstruct spwd *sgetspent(char\fR
\fI*cp\fR\fI);\fR
.PP
\fIint putspent(struct spwd\fR
\fI*p,\fR
\fIFILE\fR
\fI*fp\fR\fI);\fR
.PP
\fIint lckpwdf();\fR
.PP
\fIint ulckpwdf();\fR
.SH "DESCRIPTION"
.PP
\fIshadow\fR
manipulates the contents of the shadow password file,
/etc/shadow\&. The structure in the
\fI#include\fR
file is:
.sp
.if n \{\
.RS 4
.\}
.nf
struct spwd {
char *sp_namp; /* user login name */
char *sp_pwdp; /* encrypted password */
long int sp_lstchg; /* last password change */
long int sp_min; /* days until change allowed\&. */
long int sp_max; /* days before change required */
long int sp_warn; /* days warning for expiration */
long int sp_inact; /* days before account inactive */
long int sp_expire; /* date when account expires */
unsigned long int sp_flag; /* reserved for future use */
}
.fi
.if n \{\
.RE
.\}
.PP
La signification de chaque champ est la suivante\ \&:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
sp_namp \- pointeur vers le nom d\*(Aqutilisateur termin\('e par un z\('ero binaire (\(Fo\ \&null\-terminated\ \&\(Fc)
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
sp_pwdp \- pointeur vers le mot de passe termin\('e par un z\('ero binaire (\(Fo\ \&null\-terminated\ \&\(Fc)
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
sp_lstchg \- nombre de jours, compt\('es \(`a partir du 1er\ \&janvier\ \&1970, depuis la derni\(`ere modification du mot de passe
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
sp_min \- nombre de jours pendant lesquels le mot de passe ne peut pas \(^etre chang\('e
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
sp_max \- nombre maximal de jours avant que le mot de passe doive \(^etre chang\('e
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
sp_warn \- nombre de jours avant que le mot de passe n\*(Aqarrive en fin de validit\('e pendant lesquels l\*(Aqutilisateur est averti de la fin prochaine de la validit\('e de son mot de passe
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
sp_inact \- nombre de jours apr\(`es la fin de validit\('e du mot de passe avant de consid\('erer que le compte est inactif et soit d\('esactiv\('e
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
sp_expire \- nombre de jours, compt\('es \(`a partir du 1er\ \&janvier\ \&1970, apr\(`es lesquels le compte sera d\('esactiv\('e
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
sp_flag \- r\('eserv\('e pour une utilisation future
.RE
.SH "DESCRIPTION"
.PP
\fIgetspent\fR,
\fIgetspname\fR,
\fIfgetspent\fR, and
\fIsgetspent\fR
each return a pointer to a
\fIstruct spwd\fR\&.
\fIgetspent\fR
returns the next entry from the file, and
\fIfgetspent\fR
returns the next entry from the given stream, which is assumed to be a file of the proper format\&.
\fIsgetspent\fR
returns a pointer to a
\fIstruct spwd\fR
using the provided string as input\&.
\fIgetspnam\fR
searches from the current position in the file for an entry matching
\fIname\fR\&.
.PP
\fIsetspent\fR
and
\fIendspent\fR
may be used to begin and end, respectively, access to the shadow password file\&.
.PP
The
\fIlckpwdf\fR
and
\fIulckpwdf\fR
routines should be used to insure exclusive access to the
/etc/shadow
file\&.
\fIlckpwdf\fR
attempts to acquire a lock using
\fIpw_lock\fR
for up to 15 seconds\&. It continues by attempting to acquire a second lock using
\fIspw_lock\fR
for the remainder of the initial 15 seconds\&. Should either attempt fail after a total of 15 seconds,
\fIlckpwdf\fR
returns \-1\&. When both locks are acquired 0 is returned\&.
.SH "DIAGNOSTICS"
.PP
Routines return NULL if no more entries are available or if an error occurs during processing\&. Routines which have
\fIint\fR
as the return value return 0 for success and \-1 for failure\&.
.SH "AVERTISSEMENTS"
.PP
Ces fonctions peuvent n\*(Aq\(^etre utilis\('ees que par le superutilisateur car l\*(Aqacc\(`es au fichier de mots de passe cach\('es est restreint\&.
.SH "FICHIERS"
.PP
/etc/shadow
.RS 4
Informations s\('ecuris\('ees sur les comptes utilisateurs\&.
.RE
.SH "VOIR AUSSI"
.PP
\fBgetpwent\fR(3),
\fBshadow\fR(5)\&.