[review v2] Use getpwuid_r instead of getpwuid when available

[Tom Tromey (Code Review)]

Tom Tromey has posted comments on this change.

Change URL: https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/485
......................................................................


Patch Set 2:

(1 comment)

Thank you for this and the other "_r" patches.

I think this one can be hugely simplified, see below.

| --- gdb/nat/linux-osdata.c
| +++ gdb/nat/linux-osdata.c
| @@ -204,11 +204,18 @@ /* Finds the user name for the user UID and copies it into USER.  At
|  
|  static void
|  user_from_uid (char *user, int maxlen, uid_t uid)
|  {
| -  struct passwd *pwentry = getpwuid (uid);
| +  struct passwd *pwentry;
| +#ifdef HAVE_GETPWUID_R
| +  char buf[1024];
| +  struct passwd pwd;
| +  getpwuid_r (uid, &pwd, buf, sizeof (buf), &pwentry);

PS2, Line 212:

I think that, because the only use is in a "nat" file,
and because we know this is always available on Linux,
then there's no need for the configury.  We can just call
this unconditionally.

| +#else
| +  pwentry = getpwuid (uid);
| +#endif
|  
|    if (pwentry)
|      {
|        strncpy (user, pwentry->pw_name, maxlen);
|        /* Ensure that the user name is null-terminated.  */
|        user[maxlen - 1] = '\0';

-- 
Gerrit-Project: binutils-gdb
Gerrit-Branch: master
Gerrit-Change-Id: I587359267f8963ef1da6ba0223a1525807a721de
Gerrit-Change-Number: 485
Gerrit-PatchSet: 2
Gerrit-Owner: Christian Biesinger <cbiesinger@google.com>
Gerrit-CC: Tom Tromey <tromey@sourceware.org>
Gerrit-Comment-Date: Mon, 11 Nov 2019 14:57:19 +0000
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