devspec.en_US/project/recutils/lib/getprogname.c

   1 /* Program name management.
   2    Copyright (C) 2016-2019 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 <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/r/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       if (pstat_getproc (&status, sizeof status, 0, pid) > 0)
 114         {
 115           char *ucomm = status.pst_ucomm;
 116           char *cmd = status.pst_cmd;
 117           if (strlen (ucomm) < PST_UCOMMLEN - 1)
 118             p = ucomm;
 119           else
 120             {
 121               /* ucomm is truncated to length PST_UCOMMLEN - 1.
 122                  Look at cmd instead.  */
 123               char *space = strchr (cmd, ' ');
 124               if (space != NULL)
 125                 *space = '\0';
 126               p = strrchr (cmd, '/');
 127               if (p != NULL)
 128                 p++;
 129               else
 130                 p = cmd;
 131               if (strlen (p) > PST_UCOMMLEN - 1
 132                   && memcmp (p, ucomm, PST_UCOMMLEN - 1) == 0)
 133                 /* p is less truncated than ucomm.  */
 134                 ;
 135               else
 136                 p = ucomm;
 137             }
 138           p = strdup (p);
 139         }
 140       else
 141         {
 142 #  if !defined __LP64__
 143           /* Support for 32-bit programs running in 64-bit HP-UX.
 144              The documented way to do this is to use the same source code
 145              as above, but in a compilation unit where '#define _PSTAT64 1'
 146              is in effect.  I prefer a single compilation unit; the struct
 147              size and the offsets are not going to change.  */
 148           char status64[1216];
 149           if (__pstat_getproc64 (status64, sizeof status64, 0, pid) > 0)
 150             {
 151               char *ucomm = status64 + 288;
 152               char *cmd = status64 + 168;
 153               if (strlen (ucomm) < PST_UCOMMLEN - 1)
 154                 p = ucomm;
 155               else
 156                 {
 157                   /* ucomm is truncated to length PST_UCOMMLEN - 1.
 158                      Look at cmd instead.  */
 159                   char *space = strchr (cmd, ' ');
 160                   if (space != NULL)
 161                     *space = '\0';
 162                   p = strrchr (cmd, '/');
 163                   if (p != NULL)
 164                     p++;
 165                   else
 166                     p = cmd;
 167                   if (strlen (p) > PST_UCOMMLEN - 1
 168                       && memcmp (p, ucomm, PST_UCOMMLEN - 1) == 0)
 169                     /* p is less truncated than ucomm.  */
 170                     ;
 171                   else
 172                     p = ucomm;
 173                 }
 174               p = strdup (p);
 175             }
 176           else
 177 #  endif
 178             p = NULL;
 179         }
 180       if (!p)
 181         p = "?";
 182     }
 183   return p;
 184 # elif __MVS__                                              /* z/OS */
 185   /* https://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.bpxbd00/rtwgetp.htm */
 186   static char *p = "?";
 187   static int first = 1;
 188   if (first)
 189     {
 190       pid_t pid = getpid ();
 191       int token;
 192       W_PSPROC buf;
 193       first = 0;
 194       memset (&buf, 0, sizeof(buf));
 195       buf.ps_cmdptr    = (char *) malloc (buf.ps_cmdlen    = PS_CMDBLEN_LONG);
 196       buf.ps_conttyptr = (char *) malloc (buf.ps_conttylen = PS_CONTTYBLEN);
 197       buf.ps_pathptr   = (char *) malloc (buf.ps_pathlen   = PS_PATHBLEN);
 198       if (buf.ps_cmdptr && buf.ps_conttyptr && buf.ps_pathptr)
 199         {
 200           for (token = 0; token >= 0;
 201                token = w_getpsent (token, &buf, sizeof(buf)))
 202             {
 203               if (token > 0 && buf.ps_pid == pid)
 204                 {
 205                   char *s = strdup (last_component (buf.ps_pathptr));
 206                   if (s)
 207                     p = s;
 208                   break;
 209                 }
 210             }
 211         }
 212       free (buf.ps_cmdptr);
 213       free (buf.ps_conttyptr);
 214       free (buf.ps_pathptr);
 215     }
 216   return p;
 217 # elif defined __sgi                                        /* IRIX */
 218   char filename[50];
 219   int fd;
 220
 221   sprintf (filename, "/proc/pinfo/%d", (int) getpid ());
 222   fd = open (filename, O_RDONLY);
 223   if (0 <= fd)
 224     {
 225       prpsinfo_t buf;
 226       int ioctl_ok = 0 <= ioctl (fd, PIOCPSINFO, &buf);
 227       close (fd);
 228       if (ioctl_ok)
 229         {
 230           char *name = buf.pr_fname;
 231           size_t namesize = sizeof buf.pr_fname;
 232           char *namenul = memchr (name, '\0', namesize);
 233           size_t namelen = namenul ? namenul - name : namesize;
 234           char *namecopy = malloc (namelen + 1);
 235           if (namecopy)
 236             {
 237               namecopy[namelen] = 0;
 238               return memcpy (namecopy, name, namelen);
 239             }
 240         }
 241     }
 242   return NULL;
 243 # else
 244 #  error "getprogname module not ported to this OS"
 245 # endif
 246 }
 247
 248 #endif
 249
 250 /*
 251  * Hey Emacs!
 252  * Local Variables:
 253  * coding: utf-8
 254  * End:
 255  */