man3/fgetpwent.3

   1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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  24 .\"
  25 .\" References consulted:
  26 .\"     Linux libc source code
  27 .\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
  28 .\"     386BSD man pages
  29 .\"
  30 .\" Modified Sat Jul 24 19:37:37 1993 by Rik Faith (faith@cs.unc.edu)
  31 .\" Modified Mon May 27 22:40:48 1996 by Martin Schulze (joey@linux.de)
  32 .\"
  33 .TH FGETPWENT 3  2016-03-15 "GNU" "Linux Programmer's Manual"
  34 .SH NAME
  35 fgetpwent \- get password file entry
  36 .SH SYNOPSIS
  37 .nf
  38 .B #include <stdio.h>
  39 .B #include <sys/types.h>
  40 .B #include <pwd.h>
  41 .PP
  42 .BI "struct passwd *fgetpwent(FILE *" stream );
  43 .fi
  44 .PP
  45 .in -4n
  46 Feature Test Macro Requirements for glibc (see
  47 .BR feature_test_macros (7)):
  48 .in
  49 .PP
  50 .BR fgetpwent ():
  51     Since glibc 2.19:
  52         _DEFAULT_SOURCE
  53     Glibc 2.19 and earlier:
  54         _SVID_SOURCE
  55 .SH DESCRIPTION
  56 The
  57 .BR fgetpwent ()
  58 function returns a pointer to a structure containing
  59 the broken out fields of a line in the file \fIstream\fP.
  60 The first time it is called it returns the first entry;
  61 thereafter, it returns successive entries.
  62 The file referred to by
  63 .I stream
  64 must have the same format as
  65 .I /etc/passwd
  66 (see
  67 .BR passwd (5)).
  68 .PP
  69 The \fIpasswd\fP structure is defined in \fI<pwd.h>\fP as follows:
  70 .sp
  71 .in +4n
  72 .nf
  73 struct passwd {
  74     char   *pw_name;       /* username */
  75     char   *pw_passwd;     /* user password */
  76     uid_t   pw_uid;        /* user ID */
  77     gid_t   pw_gid;        /* group ID */
  78     char   *pw_gecos;      /* real name */
  79     char   *pw_dir;        /* home directory */
  80     char   *pw_shell;      /* shell program */
  81 };
  82 .fi
  83 .in
  84 .SH RETURN VALUE
  85 The
  86 .BR fgetpwent ()
  87 function returns a pointer to a
  88 .I passwd
  89 structure, or NULL if
  90 there are no more entries or an error occurs.
  91 In the event of an error,
  92 .I errno
  93 is set to indicate the cause.
  94 .SH ERRORS
  95 .TP
  96 .B ENOMEM
  97 Insufficient memory to allocate
  98 .I passwd
  99 structure.
 100 .SH FILES
 101 .TP
 102 .I /etc/passwd
 103 password database file
 104 .TS
 105 allbox;
 106 lb lb lb
 107 l l l.
 108 Interface       Attribute       Value
 109 T{
 110 .BR fgetpwent ()
 111 T}      Thread safety   MT-Unsafe race:fgetpwent
 112 .TE
 113 .\" FIXME: The marking is different from that in the glibc manual,
 114 .\" which has:
 115 .\"
 116 .\"    fgetpwent: MT-Unsafe race:fpwent
 117 .\"
 118 .\" We think race:fpwent in glibc maybe hard for users to understand,
 119 .\" and have sent a patch to the GNU libc community for changing it to
 120 .\" race:fgetpwent, however, something about the copyright impeded the
 121 .\" progress.
 122 .SH CONFORMING TO
 123 SVr4.
 124 .SH SEE ALSO
 125 .BR endpwent (3),
 126 .BR fgetpwent_r (3),
 127 .BR fopen (3),
 128 .BR getpw (3),
 129 .BR getpwent (3),
 130 .BR getpwnam (3),
 131 .BR getpwuid (3),
 132 .BR putpwent (3),
 133 .BR setpwent (3),
 134 .BR passwd (5)