github.com/rigado/snapd@v2.42.5-go-mod+incompatible/cmd/snap-gdb-shim/snap-gdb-shim.c (about)

     1  /*
     2   * Copyright (C) 2018 Canonical Ltd
     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 version 3 as
     6   * published by the Free Software Foundation.
     7   *
     8   * This program is distributed in the hope that it will be useful,
     9   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    10   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    11   * GNU General Public License for more details.
    12   *
    13   * You should have received a copy of the GNU General Public License
    14   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    15   *
    16   */
    17  
    18  #include <signal.h>
    19  #include <stdio.h>
    20  #include <stdlib.h>
    21  #include <unistd.h>
    22  
    23  #include "../libsnap-confine-private/utils.h"
    24  
    25  int main(int argc, char **argv)
    26  {
    27  	if (sc_is_debug_enabled()) {
    28  		for (int i = 0; i < argc; i++) {
    29  			printf("-%s-\n", argv[i]);
    30  		}
    31  	}
    32  	// signal gdb to stop here
    33  	printf("\n\n");
    34  	printf("Welcome to `snap run --gdb`.\n");
    35  	printf("You are right before your application is execed():\n");
    36  	printf("- set any options you may need\n");
    37  	printf("- use 'cont' to start\n");
    38  	printf("\n\n");
    39  	raise(SIGTRAP);
    40  
    41  	const char *executable = argv[1];
    42  	execv(executable, (char *const *)&argv[1]);
    43  	perror("execv failed");
    44  	// very different exit code to make an execve failure easy to distinguish
    45  	return 101;
    46  }