136 lines
2.9 KiB
C++
136 lines
2.9 KiB
C++
/*
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* Mr. 4th Dimention - Allen Webster
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*
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* 30.06.2017
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*
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* General unix functions
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*
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*/
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// TOP
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#if defined(USE_LOG)
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# include <stdio.h>
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#endif
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struct Unix_Vars{
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b32 do_logging;
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};
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static Unix_Vars unixvars;
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//
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// Logging
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//
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internal
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Sys_Log_Sig(system_log){
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if (unixvars.do_logging){
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i32 fd = open("4coder_log.txt", O_WRONLY | O_CREAT, 00640);
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if (fd >= 0){
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do{
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ssize_t written = write(fd, message, length);
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if (written != -1){
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length -= written;
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message += written;
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}
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} while(length > 0);
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close(fd);
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}
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}
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}
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//
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// Shared system functions (system_shared.h)
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//
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internal
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Sys_File_Can_Be_Made_Sig(system_file_can_be_made){
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b32 result = access((char*)filename, W_OK) == 0;
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LOGF("%s = %d", filename, result);
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return(result);
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}
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internal
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Sys_Get_Binary_Path_Sig(system_get_binary_path){
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ssize_t size = readlink("/proc/self/exe", out->str, out->memory_size - 1);
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if(size != -1 && size < out->memory_size - 1){
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out->size = size;
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remove_last_folder(out);
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terminate_with_null(out);
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size = out->size;
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} else {
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size = 0;
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}
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return size;
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}
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//
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// Memory
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//
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internal
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Sys_Memory_Allocate_Sig(system_memory_allocate){
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// NOTE(allen): This must return the exact base of the vpage.
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// We will count on the user to keep track of size themselves.
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void *result = mmap(0, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if(result == MAP_FAILED){
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LOG("mmap failed\n");
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result = NULL;
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}
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return(result);
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}
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internal
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Sys_Memory_Set_Protection_Sig(system_memory_set_protection){
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bool32 result = true;
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int protect = 0;
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switch (flags & 0x7){
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case 0: protect = PROT_NONE; break;
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case MemProtect_Read:
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protect = PROT_READ; break;
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case MemProtect_Write:
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case MemProtect_Read|MemProtect_Write:
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protect = PROT_READ | PROT_WRITE; break;
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case MemProtect_Execute:
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protect = PROT_EXEC; break;
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case MemProtect_Execute|MemProtect_Read:
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protect = PROT_READ | PROT_EXEC; break;
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// NOTE(inso): some W^X protection things might be unhappy about this one
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case MemProtect_Execute|MemProtect_Write:
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case MemProtect_Execute|MemProtect_Write|MemProtect_Read:
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protect = PROT_READ | PROT_WRITE | PROT_EXEC; break;
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}
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if(mprotect(ptr, size, protect) == -1){
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result = 0;
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LOG("mprotect");
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}
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return(result);
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}
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internal
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Sys_Memory_Free_Sig(system_memory_free){
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// NOTE(allen): This must take the exact base of the vpage.
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munmap(ptr, size);
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}
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// BOTTOM
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