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AK+LibSystem+LibMain: Add Error::from_syscall() for syscall failures

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This creates an error that contains the name of the syscall that failed.
This allows error handlers to print out the name of the call if they
want to. :^)
This commit is contained in:
Andreas Kling
2021-11-22 16:00:53 +01:00
parent d3cf68a540
commit 4e530135d5
Notes: sideshowbarker 2024-07-18 00:52:47 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/4e530135d55
3 changed files with 26 additions and 7 deletions
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14
Userland/Libraries/LibSystem/Wrappers.cpp
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@@ -7,6 +7,12 @@
#include <LibSystem/Wrappers.h>
#include <LibSystem/syscall.h>
#define HANDLE_SYSCALL_RETURN_VALUE(syscall_name, rc) \
if ((rc) < 0) { \
return Error::from_syscall(syscall_name, rc); \
} \
return {};
namespace System {
ErrorOr<void> pledge(StringView promises, StringView execpromises)
@@ -16,9 +22,7 @@ ErrorOr<void> pledge(StringView promises, StringView execpromises)
{ execpromises.characters_without_null_termination(), execpromises.length() },
};
int rc = syscall(SC_pledge, &params);
if (rc < 0)
return Error::from_errno(-rc);
return {};
HANDLE_SYSCALL_RETURN_VALUE("pledge"sv, rc);
}
ErrorOr<void> unveil(StringView path, StringView permissions)
@@ -28,9 +32,7 @@ ErrorOr<void> unveil(StringView path, StringView permissions)
{ permissions.characters_without_null_termination(), permissions.length() },
};
int rc = syscall(SC_unveil, &params);
if (rc < 0)
return Error::from_errno(-rc);
return {};
HANDLE_SYSCALL_RETURN_VALUE("unveil"sv, rc);
}
}