f2d50bbf9c
This change implements a dependency tracking daemon(7) system in init with overridable init(5) configuration, parallel startup, readiness signaling, rotating logs, reliable stopping, and handling of leaked processes. The /etc/init/target file is replaced by the new /etc/init/default per the new init(5) format. The old configuration is migrated upon upgrade using an upgrade hook. extfs(8) now signals readiness using READYFD for fast mounting. Filesystems that fail to be repaired are now mounted read-only. The mounting and filesystem checking code is synchronized with sysinstall. The duplicated array_add utility function now protects against overflows. tix-iso-bootconfig(8) gains the --init-target option. tix-iso-liveconfig(8) gains the --daemons option.
140 lines
3 KiB
C
140 lines
3 KiB
C
/*
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* Copyright (c) 2011, 2012, 2013, 2014, 2015, 2022 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* util.c
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* Utility functions.
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*/
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include "util.h"
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char* strdup_safe(const char* string)
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{
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return string ? strdup(string) : NULL;
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}
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const char* getenv_safe_def(const char* name, const char* def)
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{
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const char* ret = getenv(name);
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return ret ? ret : def;
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}
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const char* getenv_safe(const char* name)
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{
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return getenv_safe_def(name, "");
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}
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bool array_add(void*** array_ptr,
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size_t* used_ptr,
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size_t* length_ptr,
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void* value)
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{
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void** array;
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memcpy(&array, array_ptr, sizeof(array)); // Strict aliasing.
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if ( *used_ptr == *length_ptr )
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{
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size_t length = *length_ptr;
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if ( !length )
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length = 4;
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void** new_array = reallocarray(array, length, 2 * sizeof(void*));
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if ( !new_array )
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return false;
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array = new_array;
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memcpy(array_ptr, &array, sizeof(array)); // Strict aliasing.
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*length_ptr = length * 2;
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}
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memcpy(array + (*used_ptr)++, &value, sizeof(value)); // Strict aliasing.
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return true;
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}
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void stringbuf_begin(struct stringbuf* buf)
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{
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buf->length = 0;
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buf->allocated_size = 32;
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if ( !(buf->string = (char*) malloc(buf->allocated_size)) )
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{
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buf->allocated_size = 0;
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return;
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}
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buf->string[0] = '\0';
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}
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bool might_need_shell_quote(char c)
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{
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switch ( c )
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{
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case '|':
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case '&':
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case ';':
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case '<':
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case '>':
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case '(':
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case ')':
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case '$':
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case '`':
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case '\\':
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case '"':
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case '\'':
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case ' ':
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case '\t':
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case '*':
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case '?':
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case '[':
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case '#':
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case '~':
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case '=':
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case '%':
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return true;
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default:
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return false;
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}
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}
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void stringbuf_append_c(struct stringbuf* buf, char c)
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{
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if ( !buf->string )
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return;
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if ( buf->length + 1 == buf->allocated_size )
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{
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// TODO: Avoid overflow.
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size_t new_allocated_size = 2 * buf->allocated_size;
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char* new_string = (char*) realloc(buf->string, new_allocated_size);
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if ( !new_string )
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{
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buf->string = NULL;
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buf->length = 0;
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buf->allocated_size = 0;
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return;
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}
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buf->string = new_string;
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buf->allocated_size = new_allocated_size;
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}
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buf->string[buf->length++] = c;
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buf->string[buf->length] = '\0';
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}
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char* stringbuf_finish(struct stringbuf* buf)
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{
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if ( !buf->string )
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return NULL;
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return buf->string;
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}
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