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sortix--sortix/utils/pstree.cpp
Jonas 'Sortie' Termansen 6dce46c081 Add pstree(1).
2015-12-12 19:28:07 +01:00

197 lines
5 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2015.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
pstree.cpp
Lists processes in a nice tree.
*******************************************************************************/
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <locale.h>
#include <psctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
const char* last_basename(const char* path)
{
const char* result = path;
for ( size_t i = 0; path[i]; i++ )
if ( path[i] == '/' && path[i + 1] != '/' && path[i + 1] )
result = path + i + 1;
return result;
}
static char* get_program_path_of_pid(pid_t pid)
{
struct psctl_program_path ctl;
memset(&ctl, 0, sizeof(ctl));
ctl.buffer = NULL;
ctl.size = 0;
if ( psctl(pid, PSCTL_PROGRAM_PATH, &ctl) < 0 )
return NULL;
while ( true )
{
char* new_buffer = (char*) realloc(ctl.buffer, ctl.size);
if ( !new_buffer )
return free(ctl.buffer), (char*) NULL;
ctl.buffer = new_buffer;
if ( psctl(pid, PSCTL_PROGRAM_PATH, &ctl) == 0 )
return ctl.buffer;
if ( errno != ERANGE )
return free(ctl.buffer), (char*) NULL;
}
}
static void pstree(pid_t pid, const char* prefix, bool continuation)
{
while ( pid != -1 )
{
struct psctl_stat psst;
if ( psctl(pid, PSCTL_STAT, &psst) < 0 )
{
if ( errno != ESRCH )
warn("psctl: PSCTL_STAT: [%" PRIiPID "]", pid);
return;
}
char* path_string = get_program_path_of_pid(pid);
const char* path = last_basename(path_string ? path_string : "<unknown>");
if ( !continuation )
fputs(prefix, stdout);
if ( prefix[0] )
{
if ( continuation )
fputs("", stdout);
else
fputs(" ", stdout);
if ( continuation )
fputs(psst.ppid_next == -1 ? "" : "", stdout);
else
fputs(psst.ppid_next == -1 ? "" : "", stdout);
fputs("", stdout);
}
printf("%s", path);
if ( psst.ppid_first != -1 )
{
size_t path_length = strlen(path);
char* new_prefix;
if ( prefix[0] )
{
size_t prefix_length = strlen(prefix);
size_t new_prefix_length = prefix_length + 3 + path_length;
if ( !(new_prefix = (char*) malloc(new_prefix_length + 1)) )
err(1, "malloc");
memcpy(new_prefix, prefix, prefix_length);
memcpy(new_prefix + prefix_length,
psst.ppid_next != -1 ? " | " : " ", 3);
for ( size_t i = 0; i < path_length; i++ )
new_prefix[prefix_length + 3 + i] = ' ';
new_prefix[prefix_length + 3 + path_length] = '\0';
}
else
{
if ( !(new_prefix = (char*) malloc(path_length + 1)) )
err(1, "malloc");
for ( size_t i = 0; i < path_length; i++ )
new_prefix[i] = ' ';
new_prefix[path_length] = '\0';
}
pstree(psst.ppid_first, new_prefix, true);
free(new_prefix);
}
else
printf("\n");
free(path_string);
continuation = false;
pid = psst.ppid_next;
}
}
static void compact_arguments(int* argc, char*** argv)
{
for ( int i = 0; i < *argc; i++ )
{
while ( i < *argc && !(*argv)[i] )
{
for ( int n = i; n < *argc; n++ )
(*argv)[n] = (*argv)[n+1];
(*argc)--;
}
}
}
static void help(FILE* fp, const char* argv0)
{
fprintf(fp, "Usage: %s [OPTION]...\n", argv0);
fprintf(fp, "List processes.\n");
}
static void version(FILE* fp, const char* argv0)
{
fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
fprintf(fp, "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n");
fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
}
int main(int argc, char* argv[])
{
setlocale(LC_ALL, "");
const char* argv0 = argv[0];
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( arg[0] != '-' || !arg[1] )
continue;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[1] != '-' )
{
while ( char c = *++arg ) switch ( c )
{
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
help(stderr, argv0);
exit(1);
}
}
else if ( !strcmp(arg, "--help") )
help(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--version") )
version(stdout, argv0), exit(0);
else
{
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
help(stderr, argv0);
exit(1);
}
}
compact_arguments(&argc, &argv);
if ( 1 < argc )
err(1, "extra operand: %s", argv[1]);
pstree(1, "", true);
return ferror(stdout) || fflush(stdout) == EOF ? 1 : 0;
}