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Implement the <pwd.h> API properly.

This commit is contained in:
Jonas 'Sortie' Termansen 2013-10-01 20:21:50 +02:00
parent 69f2a3ef91
commit a7e1207e0f
15 changed files with 644 additions and 127 deletions
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1
Makefile
View File

@ -57,6 +57,7 @@ sysroot-fsh:
mkdir -p "$(SYSROOT)/share"
mkdir -p "$(SYSROOT)/src"
mkdir -p "$(SYSROOT)/tmp"
echo "root::0:0:root:/root:sh" > "$(SYSROOT)/etc/passwd"
.PHONY: sysroot-base-headers
sysroot-base-headers: sysroot-fsh

12
libc/Makefile
View File

@ -273,7 +273,17 @@ netdb/setprotoent.o \
netdb/setservent.o \
poll/poll.o \
poll/ppoll.o \
pwd/pwent.o \
pwd/endpwent.o \
pwd/fgetpwent.o \
pwd/fgetpwent_r.o \
pwd/getpwent.o \
pwd/getpwent_r.o \
pwd/getpwnam.o \
pwd/getpwnam_r.o \
pwd/getpwuid.o \
pwd/getpwuid_r.o \
pwd/openpw.o \
pwd/setpwent.o \
signal/kill.o \
signal/killpg.o \
signal/psignal.o \

30
libc/include/pwd.h
View File

@ -31,28 +31,40 @@
__BEGIN_DECLS
@include(FILE.h)
@include(gid_t.h)
@include(uid_t.h)
@include(size_t.h)
#define _PASSWD_BUFFER_SIZE 64
@include(uid_t.h)
struct passwd
{
char pw_name[_PASSWD_BUFFER_SIZE];
char pw_dir[_PASSWD_BUFFER_SIZE];
char pw_shell[_PASSWD_BUFFER_SIZE];
char pw_gecos[_PASSWD_BUFFER_SIZE];
uid_t pw_uid;
gid_t pw_gid;
char* pw_dir;
char* pw_gecos;
char* pw_name;
char* pw_passwd;
char* pw_shell;
};
#if __is_sortix_libc
extern FILE* __pwd_file;
#endif
void endpwent(void);
struct passwd* fgetpwent(FILE*);
int fgetpwent_r(FILE* __restrict, struct passwd* __restrict, char* __restrict,
size_t, struct passwd** __restrict);
struct passwd* getpwent(void);
int getpwent_r(struct passwd* __restrict, char* __restrict, size_t,
struct passwd** __restrict);
struct passwd* getpwnam(const char*);
int getpwnam_r(const char*, struct passwd*, char*, size_t, struct passwd**);
int getpwnam_r(const char* __restrict, struct passwd* __restrict,
char* __restrict, size_t, struct passwd** __restrict);
struct passwd* getpwuid(uid_t);
int getpwuid_r(uid_t, struct passwd *, char*, size_t, struct passwd**);
int getpwuid_r(uid_t, struct passwd* __restrict, char* __restrict, size_t,
struct passwd** __restrict);
FILE* openpw(void);
void setpwent(void);
__END_DECLS

34
libc/pwd/endpwent.cpp Normal file
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@ -0,0 +1,34 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
pwd/endpwent.cpp
Closes the passwd database.
*******************************************************************************/
#include <pwd.h>
#include <stdio.h>
extern "C" void endpwent(void)
{
if ( !__pwd_file )
return;
fclose(__pwd_file);
__pwd_file = NULL;
}

57
libc/pwd/fgetpwent.cpp Normal file
View File

@ -0,0 +1,57 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
pwd/fgetpwent.cpp
Reads a passwd entry from a FILE in a thread-insecure manner.
*******************************************************************************/
#include <errno.h>
#include <pwd.h>
#include <stdlib.h>
extern "C" struct passwd* fgetpwent(FILE* fp)
{
static struct passwd result_object;
static char* buf = NULL;
static size_t buflen = 0;
if ( !buf )
{
size_t new_buflen = 64;
if ( !(buf = (char*) malloc(new_buflen)) )
return NULL;
buflen = new_buflen;
}
struct passwd* result;
retry:
int errnum = fgetpwent_r(fp, &result_object, buf, buflen, &result);
if ( errnum == ERANGE )
{
size_t new_buflen = 2 * buflen;
char* new_buf = (char*) realloc(buf, new_buflen);
if ( !new_buf )
return NULL;
buf = new_buf;
buflen = new_buflen;
goto retry;
}
if ( errnum < 0 )
return errno = errnum, (struct passwd*) NULL;
return result;
}

156
libc/pwd/fgetpwent_r.cpp Normal file
View File

@ -0,0 +1,156 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
pwd/fgetpwent_r.cpp
Reads a passwd entry from a FILE.
*******************************************************************************/
#include <sys/types.h>
#include <errno.h>
#include <inttypes.h>
#include <pwd.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static char* next_field(char** current)
{
char* result = *current;
if ( result )
{
char* next = result;
while ( *next && *next != ':' )
next++;
if ( !*next )
next = NULL;
else
*next++ = '\0';
*current = next;
}
return result;
}
static id_t next_field_id(char** current)
{
char* id_str = next_field(current);
if ( !id_str )
return -1;
char* id_endptr;
intmax_t id_imax = strtoimax(id_str, &id_endptr, 10);
if ( id_imax < 0 || *id_endptr )
return -1;
id_t id = (id_t) id_imax;
if ( id != id_imax )
return -1;
return id;
}
extern "C"
int fgetpwent_r(FILE* restrict fp,
struct passwd* restrict result,
char* restrict buf,
size_t buf_len,
struct passwd** restrict result_pointer)
{
if ( !result_pointer )
return errno = EINVAL;
if ( !fp || !result || !buf )
return *result_pointer = NULL, errno = EINVAL;
int original_errno = errno;
flockfile(fp);
off_t original_offset = ftello(fp);
if ( original_offset < 0 )
{
funlockfile(fp);
return *result_pointer = NULL, errno;
}
size_t buf_used = 0;
int ic;
while ( (ic = fgetc(fp)) != EOF )
{
if ( ic == '\n' )
break;
if ( buf_used == buf_len )
{
fseeko(fp, original_offset, SEEK_SET);
funlockfile(fp);
return *result_pointer = NULL, errno = ERANGE;
}
buf[buf_used++] = (char) ic;
}
if ( ferror(fp) )
{
int original_error = errno;
fseeko(fp, original_offset, SEEK_SET);
funlockfile(fp);
return *result_pointer = NULL, original_error;
}
if ( !buf_used && feof(fp) )
{
funlockfile(fp);
return *result_pointer = NULL, errno = original_errno, NULL;
}
if ( buf_used == buf_len )
{
fseeko(fp, original_offset, SEEK_SET);
funlockfile(fp);
return *result_pointer = NULL, errno = ERANGE;
}
buf[buf_used] = '\0';
char* parse_str = buf;
if ( !(result->pw_name = next_field(&parse_str)) )
goto parse_failure;
if ( !(result->pw_passwd = next_field(&parse_str)) )
goto parse_failure;
if ( (result->pw_uid = next_field_id(&parse_str)) < 0 )
goto parse_failure;
if ( !(result->pw_gid = next_field_id(&parse_str)) < 0 )
goto parse_failure;
if ( !(result->pw_gecos = next_field(&parse_str)) )
goto parse_failure;
if ( !(result->pw_dir = next_field(&parse_str)) )
goto parse_failure;
if ( !(result->pw_shell = next_field(&parse_str)) )
goto parse_failure;
if ( parse_str )
goto parse_failure;
funlockfile(fp);
return *result_pointer = result, 0;
parse_failure:
fseeko(fp, original_offset, SEEK_SET);
funlockfile(fp);
return errno = EINVAL;
}

35
libc/pwd/getpwent.cpp Normal file
View File

@ -0,0 +1,35 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
pwd/getpwent.cpp
Reads a passwd entry in a thread-insecure manner.
*******************************************************************************/
#include <stddef.h>
#include <pwd.h>
extern "C" { FILE* __pwd_file = NULL; }
extern "C" struct passwd* getpwent(void)
{
if ( !__pwd_file && !(__pwd_file = openpw()) )
return NULL;
return fgetpwent(__pwd_file);
}

39
libc/pwd/getpwent_r.cpp Normal file
View File

@ -0,0 +1,39 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
pwd/getpwent_r.cpp
Reads a passwd entry (but not fully thread-securely).
*******************************************************************************/
#include <errno.h>
#include <pwd.h>
extern "C"
int getpwent_r(struct passwd* restrict result,
char* restrict buf,
size_t buflen,
struct passwd** restrict result_pointer)
{
if ( !result_pointer )
return errno = EINVAL;
if ( !__pwd_file && !(__pwd_file = openpw()) )
return errno;
return fgetpwent_r(__pwd_file, result, buf, buflen, result_pointer);
}

58
libc/pwd/getpwnam.cpp Normal file
View File

@ -0,0 +1,58 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
pwd/getpwnam.cpp
Searchs the passwd database for a user with the given username in a
thread-insecure manner.
*******************************************************************************/
#include <errno.h>
#include <pwd.h>
#include <stdlib.h>
extern "C" struct passwd* getpwnam(const char* username)
{
static struct passwd result_object;
static char* buf = NULL;
static size_t buflen = 0;
if ( !buf )
{
size_t new_buflen = 64;
if ( !(buf = (char*) malloc(new_buflen)) )
return NULL;
buflen = new_buflen;
}
struct passwd* result;
retry:
int errnum = getpwnam_r(username, &result_object, buf, buflen, &result);
if ( errnum == ERANGE )
{
size_t new_buflen = 2 * buflen;
char* new_buf = (char*) realloc(buf, new_buflen);
if ( !new_buf )
return NULL;
buf = new_buf;
buflen = new_buflen;
goto retry;
}
if ( errnum < 0 )
return errno = errnum, (struct passwd*) NULL;
return result;
}

55
libc/pwd/getpwnam_r.cpp Normal file
View File

@ -0,0 +1,55 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
pwd/getpwnam_r.cpp
Searchs the passwd database for a user with the given username.
*******************************************************************************/
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
extern "C"
int getpwnam_r(const char* restrict username,
struct passwd* restrict ret,
char* restrict buf,
size_t buflen,
struct passwd** restrict ret_ptr)
{
if ( !ret_ptr )
return errno = EINVAL;
if ( !username || !ret || !buf )
return *ret_ptr = NULL, errno = EINVAL;
FILE* fpasswd = openpw();
if ( !fpasswd )
return *ret_ptr = NULL, errno;
int errnum;
while ( (errnum = fgetpwent_r(fpasswd, ret, buf, buflen, ret_ptr)) == 0 &&
*ret_ptr )
{
if ( strcmp((*ret_ptr)->pw_name, username) != 0 )
continue;
fclose(fpasswd);
return *ret_ptr = *ret_ptr, 0;
}
fclose(fpasswd);
return *ret_ptr = NULL, errnum ? errnum : errno = ENOUSER;
}

58
libc/pwd/getpwuid.cpp Normal file
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@ -0,0 +1,58 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
pwd/getpwuid.cpp
Searchs the passwd database for a user with the given numeric user id in a
thread-insecure manner.
*******************************************************************************/
#include <errno.h>
#include <pwd.h>
#include <stdlib.h>
extern "C" struct passwd* getpwuid(uid_t uid)
{
static struct passwd result_object;
static char* buf = NULL;
static size_t buflen = 0;
if ( !buf )
{
size_t new_buflen = 64;
if ( !(buf = (char*) malloc(new_buflen)) )
return NULL;
buflen = new_buflen;
}
struct passwd* result;
retry:
int errnum = getpwuid_r(uid, &result_object, buf, buflen, &result);
if ( errnum == ERANGE )
{
size_t new_buflen = 2 * buflen;
char* new_buf = (char*) realloc(buf, new_buflen);
if ( !new_buf )
return NULL;
buf = new_buf;
buflen = new_buflen;
goto retry;
}
if ( errnum < 0 )
return errno = errnum, (struct passwd*) NULL;
return result;
}

54
libc/pwd/getpwuid_r.cpp Normal file
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@ -0,0 +1,54 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
pwd/getpwuid_r.cpp
Searchs the passwd database for a user with the given numeric user id.
*******************************************************************************/
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
extern "C"
int getpwuid_r(uid_t uid,
struct passwd* restrict ret,
char* restrict buf,
size_t buflen,
struct passwd** restrict ret_ptr)
{
if ( !ret_ptr )
return errno = EINVAL;
if ( !ret || !buf )
return *ret_ptr = NULL, errno = EINVAL;
FILE* fpasswd = openpw();
if ( !fpasswd )
return *ret_ptr = NULL, errno;
int errnum;
while ( (errnum = fgetpwent_r(fpasswd, ret, buf, buflen, ret_ptr)) == 0 &&
*ret_ptr )
{
if ( (*ret_ptr)->pw_uid != uid )
continue;
fclose(fpasswd);
return *ret_ptr = *ret_ptr, 0;
}
fclose(fpasswd);
return *ret_ptr = NULL, errnum ? errnum : errno = ENOUSER;
}

31
libc/pwd/openpw.cpp Normal file
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@ -0,0 +1,31 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
pwd/openpw.cpp
Opens the passwd database and returns a FILE to it.
*******************************************************************************/
#include <pwd.h>
#include <stdio.h>
extern "C" FILE* openpw(void)
{
return fopen("/etc/passwd", "r");
}

117
libc/pwd/pwent.cpp
View File

@ -1,117 +0,0 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
pwd/pwent.cpp
User database.
*******************************************************************************/
#include <sys/types.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
// TODO: This implementation of pwent is very hacky and insecure.
const char* const ROOT_UID = "0";
const char* const ROOT_GID = "0";
const char* const ROOT_NAME = "root";
const char* const ROOT_HOME = "/root";
const char* const ROOT_SHELL = "sh";
const char* const ROOT_FULLNAME = "root";
static struct passwd global_passwd;
static size_t global_user_offset = 0;
extern "C" void setpwent(void)
{
global_user_offset = 0;
}
extern "C" void endpwent(void)
{
}
static const char* getenv_def(const char* key, const char* def)
{
const char* value = getenv(key);
return value ? value : def;
}
static struct passwd* fill_passwd(struct passwd* pw)
{
// TODO: Potential buffer overflow.
strcpy(pw->pw_name, getenv_def("USERNAME", ROOT_NAME));
strcpy(pw->pw_dir, getenv_def("HOME", ROOT_HOME));
strcpy(pw->pw_shell, getenv_def("SHELL", ROOT_SHELL));
strcpy(pw->pw_gecos, getenv_def("USERFULLNAME", ROOT_FULLNAME));
pw->pw_uid = atoi(getenv_def("USERID", ROOT_UID));
pw->pw_gid = atoi(getenv_def("GROUPID", ROOT_GID));
return pw;
}
static uid_t lookup_username(const char* name)
{
const char* my_username = getenv("USERNAME") ? getenv("USERNAME") : "root";
if ( !strcmp(my_username, name) )
if ( getenv("USERID") )
return atoi(getenv("USERID"));
return atoi(ROOT_UID);
}
extern "C" struct passwd* getpwent(void)
{
if ( global_user_offset == 1 )
return NULL;
global_user_offset++;
return fill_passwd(&global_passwd);
}
extern "C" struct passwd* getpwnam(const char* name)
{
return getpwuid(lookup_username(name));
}
extern "C" int getpwnam_r(const char* name, struct passwd* pw, char* buf,
size_t buflen, struct passwd** ret)
{
return getpwuid_r(lookup_username(name), pw, buf, buflen, ret);
}
extern "C" struct passwd* getpwuid(uid_t uid)
{
struct passwd* ret;
if ( getpwuid_r(uid, &global_passwd, NULL, 0, &ret) )
return NULL;
return ret;
}
extern "C" int getpwuid_r(uid_t uid, struct passwd* pw, char* buf,
size_t buflen, struct passwd** ret)
{
(void) buf;
(void) buflen;
fill_passwd(pw);
pw->pw_uid = uid;
*ret = pw;
return 0;
}

34
libc/pwd/setpwent.cpp Normal file
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@ -0,0 +1,34 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
pwd/setpwent.cpp
Rewinds the passwd database.
*******************************************************************************/
#include <pwd.h>
#include <stdio.h>
extern "C" void setpwent(void)
{
if ( __pwd_file )
fseeko(__pwd_file, 0, SEEK_SET);
else
__pwd_file = openpw();
}