101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
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/* Copyright (C) 2010 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <pwd.h>
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#include <unistd.h>
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#include <not-cancel.h>
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#define STATIC static
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static int getlogin_r_fd0 (char *name, size_t namesize);
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#define getlogin_r getlogin_r_fd0
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#include <sysdeps/unix/getlogin_r.c>
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#undef getlogin_r
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int
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attribute_hidden
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__getlogin_r_loginuid (name, namesize)
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char *name;
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size_t namesize;
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{
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int fd = open_not_cancel_2 ("/proc/self/loginuid", O_RDONLY);
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if (fd == -1)
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return 1;
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ssize_t n = TEMP_FAILURE_RETRY (read_not_cancel (fd, name, namesize));
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close_not_cancel_no_status (fd);
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uid_t uid;
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char *endp;
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if (n <= 0
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|| (uid = strtoul (name, &endp, 10), endp == name || *endp != '\0'))
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return 1;
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size_t buflen = 1024;
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char *buf = alloca (buflen);
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bool use_malloc = false;
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struct passwd pwd;
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struct passwd *tpwd;
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int res;
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while ((res = __getpwuid_r (uid, &pwd, buf, buflen, &tpwd)) != 0)
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if (__libc_use_alloca (2 * buflen))
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extend_alloca (buf, buflen, 2 * buflen);
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else
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{
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buflen *= 2;
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char *newp = realloc (use_malloc ? buf : NULL, buflen);
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if (newp == NULL)
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{
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fail:
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if (use_malloc)
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free (buf);
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return 1;
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}
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buf = newp;
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use_malloc = true;
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}
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if (tpwd == NULL)
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goto fail;
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strncpy (name, pwd.pw_name, namesize - 1);
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name[namesize - 1] = '\0';
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if (use_malloc)
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free (buf);
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return 0;
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}
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/* Return the login name of the user, or NULL if it can't be determined.
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The returned pointer, if not NULL, is good only until the next call. */
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int
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getlogin_r (name, namesize)
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char *name;
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size_t namesize;
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{
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if (__getlogin_r_loginuid (name, namesize) == 0)
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return 0;
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return getlogin_r_fd0 (name, namesize);
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}
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libc_hidden_def (getlogin_r)
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