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Add a VMO pointer to VNode.

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This way, if anyone tries to map an already mapped file, we share the VMO.
This commit is contained in:
Andreas Kling 2018-11-08 15:39:26 +01:00
parent 862f108cb5
commit 3b2dcd5929
8 changed files with 59 additions and 10 deletions
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25
Userland/sh.cpp
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@ -139,6 +139,27 @@ close_it:
return 0;
}
static int sh_mp(int, const char**)
{
int rc;
int fd = open("/kernel.map", O_RDONLY);
if (fd < 0) {
perror("open(/kernel.map)");
return 1;
}
printf("opened /kernel.map, calling mmap...\n");
byte* data = (byte*)mmap(nullptr, getpagesize() * 10, PROT_READ, MAP_PRIVATE, fd, 0);
if (data == MAP_FAILED) {
perror("mmap()");
return 1;
}
printf("mapped file @ %p\n", data);
printf("contents: %c%c%c%c%c%c%c...\n", data[0], data[1], data[2], data[3], data[4], data[5], data[6], data[7]);
printf("leaving it open :)\n");
return 0;
}
static int sh_exit(int, const char**)
{
printf("Good-bye!\n");
@ -221,6 +242,10 @@ static bool handle_builtin(int argc, const char** argv, int& retval)
retval = sh_mf(argc, argv);
return true;
}
if (!strcmp(argv[0], "mp")) {
retval = sh_mp(argc, argv);
return true;
}
if (!strcmp(argv[0], "fork")) {
retval = sh_fork(argc, argv);
return true;