gnulib/import/getprogname.c

   1 /* Program name management.
   2    Copyright (C) 2016 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 /* Specification.  */
  20 #include "getprogname.h"
  21
  22 #include <errno.h> /* get program_invocation_name declaration */
  23 #include <stdlib.h> /* get __argv declaration */
  24
  25 #ifdef _AIX
  26 # include <unistd.h>
  27 # include <procinfo.h>
  28 # include <string.h>
  29 #endif
  30
  31 #ifdef __MVS__
  32 # ifndef _OPEN_SYS
  33 #  define _OPEN_SYS
  34 # endif
  35 # include <string.h>
  36 # include <sys/ps.h>
  37 #endif
  38
  39 #ifdef __hpux
  40 # include <unistd.h>
  41 # include <sys/param.h>
  42 # include <sys/pstat.h>
  43 # include <string.h>
  44 #endif
  45
  46 #include "dirname.h"
  47
  48 #ifndef HAVE_GETPROGNAME             /* not Mac OS X, FreeBSD, NetBSD, OpenBSD >= 5.4, Cygwin */
  49 char const *
  50 getprogname (void)
  51 {
  52 # if HAVE_DECL_PROGRAM_INVOCATION_SHORT_NAME                /* glibc, BeOS */
  53   /* https://www.gnu.org/software/libc/manual/html_node/Error-Messages.html */
  54   return program_invocation_short_name;
  55 # elif HAVE_DECL_PROGRAM_INVOCATION_NAME                    /* glibc, BeOS */
  56   /* https://www.gnu.org/software/libc/manual/html_node/Error-Messages.html */
  57   return last_component (program_invocation_name);
  58 # elif HAVE_GETEXECNAME                                     /* Solaris */
  59   /* http://docs.oracle.com/cd/E19253-01/816-5168/6mbb3hrb1/index.html */
  60   const char *p = getexecname ();
  61   if (!p)
  62     p = "?";
  63   return last_component (p);
  64 # elif HAVE_DECL___ARGV                                     /* mingw, MSVC */
  65   /* https://msdn.microsoft.com/en-us/library/dn727674.aspx */
  66   const char *p = __argv && __argv[0] ? __argv[0] : "?";
  67   return last_component (p);
  68 # elif HAVE_VAR___PROGNAME                                  /* OpenBSD, QNX */
  69   /* http://man.openbsd.org/style.9 */
  70   /* http://www.qnx.de/developers/docs/6.5.0/index.jsp?topic=%2Fcom.qnx.doc.neutrino_lib_ref%2Fp%2F__progname.html */
  71   /* Be careful to declare this only when we absolutely need it
  72      (OpenBSD 5.1), rather than when it's available.  Otherwise,
  73      its mere declaration makes program_invocation_short_name
  74      malfunction (have zero length) with Fedora 25's glibc.  */
  75   extern char *__progname;
  76   const char *p = __progname;
  77   return p && p[0] ? p : "?";
  78 # elif _AIX                                                 /* AIX */
  79   /* Idea by Bastien ROUCARIÈS,
  80      http://lists.gnu.org/archive/html/bug-gnulib/2010-12/msg00095.html
  81      Reference: http://
  82    ibm.biz/knowctr#ssw_aix_53/com.ibm.aix.basetechref/doc/basetrf1/getprocs.htm
  83   */
  84   static char *p;
  85   static int first = 1;
  86   if (first)
  87     {
  88       first = 0;
  89       pid_t pid = getpid ();
  90       struct procentry64 procs;
  91       p = (0 < getprocs64 (&procs, sizeof procs, NULL, 0, &pid, 1)
  92            ? strdup (procs.pi_comm)
  93            : NULL);
  94       if (!p)
  95         p = "?";
  96     }
  97   return p;
  98 # elif defined __hpux
  99   static char *p;
 100   static int first = 1;
 101   if (first)
 102     {
 103       first = 0;
 104       pid_t pid = getpid ();
 105       struct pst_status status;
 106       p = (0 < pstat_getproc (&status, sizeof status, 0, pid)
 107            ? strdup (status.pst_ucomm)
 108            : NULL);
 109       if (!p)
 110         p = "?";
 111     }
 112   return p;
 113 # elif __MVS__                                              /* z/OS */
 114   /* https://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.bpxbd00/rtwgetp.htm */
 115   static char *p = "?";
 116   static int first = 1;
 117   if (first)
 118     {
 119       pid_t pid = getpid ();
 120       int token;
 121       W_PSPROC buf;
 122       first = 0;
 123       memset (&buf, 0, sizeof(buf));
 124       buf.ps_cmdptr    = (char *) malloc (buf.ps_cmdlen    = PS_CMDBLEN_LONG);
 125       buf.ps_conttyptr = (char *) malloc (buf.ps_conttylen = PS_CONTTYBLEN);
 126       buf.ps_pathptr   = (char *) malloc (buf.ps_pathlen   = PS_PATHBLEN);
 127       if (buf.ps_cmdptr && buf.ps_conttyptr && buf.ps_pathptr)
 128         {
 129           for (token = 0; token >= 0;
 130                token = w_getpsent (token, &buf, sizeof(buf)))
 131             {
 132               if (token > 0 && buf.ps_pid == pid)
 133                 {
 134                   char *s = strdup (last_component (buf.ps_pathptr));
 135                   if (s)
 136                     p = s;
 137                   break;
 138                 }
 139             }
 140         }
 141       free (buf.ps_cmdptr);
 142       free (buf.ps_conttyptr);
 143       free (buf.ps_pathptr);
 144     }
 145   return p;
 146 # else
 147 #  error "getprogname module not ported to this OS"
 148 # endif
 149 }
 150
 151 #endif