lib/getprogname.c

   1 /* Program name management.
   2    Copyright (C) 2016-2020 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 "basename-lgpl.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://docs.microsoft.com/en-us/cpp/c-runtime-library/argc-argv-wargv */
  74   const char *p = __argv && __argv[0] ? __argv[0] : "?";
  75   return last_component (p);
  76 # elif HAVE_VAR___PROGNAME                                  /* OpenBSD, Android, 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 #  if defined __ANDROID__
  86   return last_component (p);
  87 #  else
  88   return p && p[0] ? p : "?";
  89 #  endif
  90 # elif _AIX                                                 /* AIX */
  91   /* Idea by Bastien ROUCARIÈS,
  92      https://lists.gnu.org/r/bug-gnulib/2010-12/msg00095.html
  93      Reference: https://www.ibm.com/support/knowledgecenter/en/ssw_aix_61/com.ibm.aix.basetrf1/getprocs.htm
  94   */
  95   static char *p;
  96   static int first = 1;
  97   if (first)
  98     {
  99       first = 0;
 100       pid_t pid = getpid ();
 101       struct procentry64 procs;
 102       p = (0 < getprocs64 (&procs, sizeof procs, NULL, 0, &pid, 1)
 103            ? strdup (procs.pi_comm)
 104            : NULL);
 105       if (!p)
 106         p = "?";
 107     }
 108   return p;
 109 # elif defined __hpux
 110   static char *p;
 111   static int first = 1;
 112   if (first)
 113     {
 114       first = 0;
 115       pid_t pid = getpid ();
 116       struct pst_status status;
 117       if (pstat_getproc (&status, sizeof status, 0, pid) > 0)
 118         {
 119           char *ucomm = status.pst_ucomm;
 120           char *cmd = status.pst_cmd;
 121           if (strlen (ucomm) < PST_UCOMMLEN - 1)
 122             p = ucomm;
 123           else
 124             {
 125               /* ucomm is truncated to length PST_UCOMMLEN - 1.
 126                  Look at cmd instead.  */
 127               char *space = strchr (cmd, ' ');
 128               if (space != NULL)
 129                 *space = '\0';
 130               p = strrchr (cmd, '/');
 131               if (p != NULL)
 132                 p++;
 133               else
 134                 p = cmd;
 135               if (strlen (p) > PST_UCOMMLEN - 1
 136                   && memcmp (p, ucomm, PST_UCOMMLEN - 1) == 0)
 137                 /* p is less truncated than ucomm.  */
 138                 ;
 139               else
 140                 p = ucomm;
 141             }
 142           p = strdup (p);
 143         }
 144       else
 145         {
 146 #  if !defined __LP64__
 147           /* Support for 32-bit programs running in 64-bit HP-UX.
 148              The documented way to do this is to use the same source code
 149              as above, but in a compilation unit where '#define _PSTAT64 1'
 150              is in effect.  I prefer a single compilation unit; the struct
 151              size and the offsets are not going to change.  */
 152           char status64[1216];
 153           if (__pstat_getproc64 (status64, sizeof status64, 0, pid) > 0)
 154             {
 155               char *ucomm = status64 + 288;
 156               char *cmd = status64 + 168;
 157               if (strlen (ucomm) < PST_UCOMMLEN - 1)
 158                 p = ucomm;
 159               else
 160                 {
 161                   /* ucomm is truncated to length PST_UCOMMLEN - 1.
 162                      Look at cmd instead.  */
 163                   char *space = strchr (cmd, ' ');
 164                   if (space != NULL)
 165                     *space = '\0';
 166                   p = strrchr (cmd, '/');
 167                   if (p != NULL)
 168                     p++;
 169                   else
 170                     p = cmd;
 171                   if (strlen (p) > PST_UCOMMLEN - 1
 172                       && memcmp (p, ucomm, PST_UCOMMLEN - 1) == 0)
 173                     /* p is less truncated than ucomm.  */
 174                     ;
 175                   else
 176                     p = ucomm;
 177                 }
 178               p = strdup (p);
 179             }
 180           else
 181 #  endif
 182             p = NULL;
 183         }
 184       if (!p)
 185         p = "?";
 186     }
 187   return p;
 188 # elif __MVS__                                              /* z/OS */
 189   /* https://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.bpxbd00/rtwgetp.htm */
 190   static char *p = "?";
 191   static int first = 1;
 192   if (first)
 193     {
 194       pid_t pid = getpid ();
 195       int token;
 196       W_PSPROC buf;
 197       first = 0;
 198       memset (&buf, 0, sizeof(buf));
 199       buf.ps_cmdptr    = (char *) malloc (buf.ps_cmdlen    = PS_CMDBLEN_LONG);
 200       buf.ps_conttyptr = (char *) malloc (buf.ps_conttylen = PS_CONTTYBLEN);
 201       buf.ps_pathptr   = (char *) malloc (buf.ps_pathlen   = PS_PATHBLEN);
 202       if (buf.ps_cmdptr && buf.ps_conttyptr && buf.ps_pathptr)
 203         {
 204           for (token = 0; token >= 0;
 205                token = w_getpsent (token, &buf, sizeof(buf)))
 206             {
 207               if (token > 0 && buf.ps_pid == pid)
 208                 {
 209                   char *s = strdup (last_component (buf.ps_pathptr));
 210                   if (s)
 211                     p = s;
 212                   break;
 213                 }
 214             }
 215         }
 216       free (buf.ps_cmdptr);
 217       free (buf.ps_conttyptr);
 218       free (buf.ps_pathptr);
 219     }
 220   return p;
 221 # elif defined __sgi                                        /* IRIX */
 222   char filename[50];
 223   int fd;
 224
 225   sprintf (filename, "/proc/pinfo/%d", (int) getpid ());
 226   fd = open (filename, O_RDONLY | O_CLOEXEC);
 227   if (0 <= fd)
 228     {
 229       prpsinfo_t buf;
 230       int ioctl_ok = 0 <= ioctl (fd, PIOCPSINFO, &buf);
 231       close (fd);
 232       if (ioctl_ok)
 233         {
 234           char *name = buf.pr_fname;
 235           size_t namesize = sizeof buf.pr_fname;
 236           /* It may not be NUL-terminated.  */
 237           char *namenul = memchr (name, '\0', namesize);
 238           size_t namelen = namenul ? namenul - name : namesize;
 239           char *namecopy = malloc (namelen + 1);
 240           if (namecopy)
 241             {
 242               namecopy[namelen] = '\0';
 243               return memcpy (namecopy, name, namelen);
 244             }
 245         }
 246     }
 247   return NULL;
 248 # else
 249 #  error "getprogname module not ported to this OS"
 250 # endif
 251 }
 252
 253 #endif
 254
 255 /*
 256  * Hey Emacs!
 257  * Local Variables:
 258  * coding: utf-8
 259  * End:
 260  */