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Shell: Add "umask" builtin for reading/writing the shell's umask.

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This commit is contained in:
Andreas Kling 2019-05-10 17:39:30 +02:00
parent c1b025b5a6
commit c838a2e652
1 changed files with 24 additions and 0 deletions
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24
Shell/main.cpp
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@ -121,6 +121,26 @@ static int sh_history(int, char**)
return 0; return 0;
} }
static int sh_umask(int argc, char** argv)
{
if (argc == 1) {
mode_t old_mask = umask(0);
printf("%#o\n", old_mask);
umask(old_mask);
return 0;
}
if (argc == 2) {
unsigned mask;
int matches = sscanf(argv[1], "%o", &mask);
if (matches == 1) {
umask(mask);
return 0;
}
}
printf("usage: umask <octal-mask>\n");
return 0;
}
static bool handle_builtin(int argc, char** argv, int& retval) static bool handle_builtin(int argc, char** argv, int& retval)
{ {
if (argc == 0) if (argc == 0)
@ -145,6 +165,10 @@ static bool handle_builtin(int argc, char** argv, int& retval)
retval = sh_history(argc, argv); retval = sh_history(argc, argv);
return true; return true;
} }
if (!strcmp(argv[0], "umask")) {
retval = sh_umask(argc, argv);
return true;
}
return false; return false;
} }