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Member "dpkg-1.19.7/lib/dpkg/progname.c" (28 Mar 2019, 2106 Bytes) of package /linux/misc/dpkg_1.19.7.tar.xz:


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    1 /*
    2  * libdpkg - Debian packaging suite library routines
    3  * progname.c - program name handling functions
    4  *
    5  * Copyright © 2011 Guillem Jover <guillem@debian.org>
    6  *
    7  * This is free software; you can redistribute it and/or modify
    8  * it under the terms of the GNU General Public License as published by
    9  * the Free Software Foundation; either version 2 of the License, or
   10  * (at your option) any later version.
   11  *
   12  * This is distributed in the hope that it will be useful,
   13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15  * GNU General Public License for more details.
   16  *
   17  * You should have received a copy of the GNU General Public License
   18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
   19  */
   20 
   21 #include <config.h>
   22 #include <compat.h>
   23 
   24 #include <errno.h>
   25 #include <stdlib.h>
   26 
   27 #include <dpkg/path.h>
   28 #include <dpkg/progname.h>
   29 
   30 static const char *progname;
   31 
   32 /**
   33  * Set the program name.
   34  *
   35  * This function will set the program name which will be used by error
   36  * reporting functions, among others.
   37  *
   38  * @param name The new program name.
   39  */
   40 void
   41 dpkg_set_progname(const char *name)
   42 {
   43     progname = path_basename(name);
   44 }
   45 
   46 #if defined(HAVE___PROGNAME)
   47 extern const char *__progname;
   48 #endif
   49 
   50 /**
   51  * Get the program name.
   52  *
   53  * The program name might have been set previously by dpkg_set_progname(),
   54  * but if not this function will try to initialize it by system dependent
   55  * means, so it's half safe to not call dpkg_set_progname() at all. At worst
   56  * the function might return NULL in that case.
   57  *
   58  * @return A pointer to a static buffer with the program name.
   59  */
   60 const char *
   61 dpkg_get_progname(void)
   62 {
   63     if (progname == NULL) {
   64 #if defined(HAVE_PROGRAM_INVOCATION_SHORT_NAME)
   65         progname = program_invocation_short_name;
   66 #elif defined(HAVE___PROGNAME)
   67         progname = __progname;
   68 #elif defined(HAVE_GETPROGNAME)
   69         progname = getprogname();
   70 #elif defined(HAVE_GETEXECNAME)
   71         /* getexecname(3) returns an absolute path, normalize it. */
   72         dpkg_set_progname(getexecname());
   73 #endif
   74     }
   75 
   76     return progname;
   77 }