lib/getprogname.c

   1 /* Program name management.
   2    Copyright (C) 2016-2017 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 Lesser General Public License as published by
   6    the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <https://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 #ifdef __sgi
  47 # include <string.h>
  48 # include <unistd.h>
  49 # include <stdio.h>
  50 # include <fcntl.h>
  51 # include <sys/procfs.h>
  52 #endif
  53
  54 #include "dirname.h"
  55
  56 #ifndef HAVE_GETPROGNAME             /* not Mac OS X, FreeBSD, NetBSD, OpenBSD >= 5.4, Cygwin */
  57 char const *
  58 getprogname (void)
  59 {
  60 # if HAVE_DECL_PROGRAM_INVOCATION_SHORT_NAME                /* glibc, BeOS */
  61   /* https://www.gnu.org/software/libc/manual/html_node/Error-Messages.html */
  62   return program_invocation_short_name;
  63 # elif HAVE_DECL_PROGRAM_INVOCATION_NAME                    /* glibc, BeOS */
  64   /* https://www.gnu.org/software/libc/manual/html_node/Error-Messages.html */
  65   return last_component (program_invocation_name);
  66 # elif HAVE_GETEXECNAME                                     /* Solaris */
  67   /* https://docs.oracle.com/cd/E19253-01/816-5168/6mbb3hrb1/index.html */
  68   const char *p = getexecname ();
  69   if (!p)
  70     p = "?";
  71   return last_component (p);
  72 # elif HAVE_DECL___ARGV                                     /* mingw, MSVC */
  73   /* https://msdn.microsoft.com/en-us/library/dn727674.aspx */
  74   const char *p = __argv && __argv[0] ? __argv[0] : "?";
  75   return last_component (p);
  76 # elif HAVE_VAR___PROGNAME                                  /* OpenBSD, QNX */
  77   /* https://man.openbsd.org/style.9 */
  78   /* http://www.qnx.de/developers/docs/6.5.0/index.jsp?topic=%2Fcom.qnx.doc.neutrino_lib_ref%2Fp%2F__progname.html */
  79   /* Be careful to declare this only when we absolutely need it
  80      (OpenBSD 5.1), rather than when it's available.  Otherwise,
  81      its mere declaration makes program_invocation_short_name
  82      malfunction (have zero length) with Fedora 25's glibc.  */
  83   extern char *__progname;
  84   const char *p = __progname;
  85   return p && p[0] ? p : "?";
  86 # elif _AIX                                                 /* AIX */
  87   /* Idea by Bastien ROUCARIÈS,
  88      https://lists.gnu.org/archive/html/bug-gnulib/2010-12/msg00095.html
  89      Reference: https://www.ibm.com/support/knowledgecenter/en/ssw_aix_61/com.ibm.aix.basetrf1/getprocs.htm
  90   */
  91   static char *p;
  92   static int first = 1;
  93   if (first)
  94     {
  95       first = 0;
  96       pid_t pid = getpid ();
  97       struct procentry64 procs;
  98       p = (0 < getprocs64 (&procs, sizeof procs, NULL, 0, &pid, 1)
  99            ? strdup (procs.pi_comm)
 100            : NULL);
 101       if (!p)
 102         p = "?";
 103     }
 104   return p;
 105 # elif defined __hpux
 106   static char *p;
 107   static int first = 1;
 108   if (first)
 109     {
 110       first = 0;
 111       pid_t pid = getpid ();
 112       struct pst_status status;
 113       p = (0 < pstat_getproc (&status, sizeof status, 0, pid)
 114            ? strdup (status.pst_ucomm)
 115            : NULL);
 116       if (!p)
 117         p = "?";
 118     }
 119   return p;
 120 # elif __MVS__                                              /* z/OS */
 121   /* https://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.bpxbd00/rtwgetp.htm */
 122   static char *p = "?";
 123   static int first = 1;
 124   if (first)
 125     {
 126       pid_t pid = getpid ();
 127       int token;
 128       W_PSPROC buf;
 129       first = 0;
 130       memset (&buf, 0, sizeof(buf));
 131       buf.ps_cmdptr    = (char *) malloc (buf.ps_cmdlen    = PS_CMDBLEN_LONG);
 132       buf.ps_conttyptr = (char *) malloc (buf.ps_conttylen = PS_CONTTYBLEN);
 133       buf.ps_pathptr   = (char *) malloc (buf.ps_pathlen   = PS_PATHBLEN);
 134       if (buf.ps_cmdptr && buf.ps_conttyptr && buf.ps_pathptr)
 135         {
 136           for (token = 0; token >= 0;
 137                token = w_getpsent (token, &buf, sizeof(buf)))
 138             {
 139               if (token > 0 && buf.ps_pid == pid)
 140                 {
 141                   char *s = strdup (last_component (buf.ps_pathptr));
 142                   if (s)
 143                     p = s;
 144                   break;
 145                 }
 146             }
 147         }
 148       free (buf.ps_cmdptr);
 149       free (buf.ps_conttyptr);
 150       free (buf.ps_pathptr);
 151     }
 152   return p;
 153 # elif defined __sgi                                        /* IRIX */
 154   char filename[50];
 155   int fd;
 156
 157   sprintf (filename, "/proc/pinfo/%d", (int) getpid ());
 158   fd = open (filename, O_RDONLY);
 159   if (0 <= fd)
 160     {
 161       prpsinfo_t buf;
 162       int ioctl_ok = 0 <= ioctl (fd, PIOCPSINFO, &buf);
 163       close (fd);
 164       if (ioctl_ok)
 165         {
 166           char *name = buf.pr_fname;
 167           char *namesize = sizeof buf.pr_fname;
 168           char *namenul = memchr (name, '\0', namesize);
 169           size_t namelen = namenul ? namenul - name : namesize;
 170           char *namecopy = malloc (namelen + 1);
 171           if (namecopy)
 172             {
 173               namecopy[namelen] = 0;
 174               return memcpy (namecopy, name, namelen);
 175             }
 176         }
 177     }
 178   return NULL;
 179 # else
 180 #  error "getprogname module not ported to this OS"
 181 # endif
 182 }
 183
 184 #endif