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shared: rewrite fail_on_null() as abort_oom_if_null()

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Recently I learnt that fprintf() is not async-signal-safe. Maybe it also
attempts to allocate memory sometimes. Hence, using it when we
presumably are out of memory is wishful thinking.

Therefore replace that with async-signal-safe code. If you have to check
pointers from traditional signal handlers, now you could do that too!

While doing this, we also lose the string formatting for line number. I
would argue that printing file and line number is not that useful, if
the system really is out of memory. If not out of memory, a core dump
would give us much more detailed information about what went wrong.

clients/window.c had some calls to fail_on_null() and these are simply
replaced. They were used for checking that creating new wl_proxy by
issuing a protocol request worked, and IIRC that only fails on
out-of-memory, so the same rationale applies here.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Pekka Paalanen
2022-07-20 12:29:56 +03:00
parent cbbf0e59a5
commit 9229a45116
2 changed files with 23 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files
shared/xalloc.h
+17 -19
View File
@@ -1,5 +1,6 @@
/*
* Copyright © 2008 Kristian Høgsberg
* Copyright 2022 Collabora, Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
@@ -31,35 +32,32 @@ extern "C" {
#endif
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <libweston/zalloc.h>
static inline void *
fail_on_null(void *p, size_t size, char *file, int32_t line)
abort_oom_if_null(void *p)
{
if (p == NULL) {
fprintf(stderr, "[%s] ", program_invocation_short_name);
if (file)
fprintf(stderr, "%s:%d: ", file, line);
fprintf(stderr, "out of memory");
if (size)
fprintf(stderr, " (%zd)", size);
fprintf(stderr, "\n");
exit(EXIT_FAILURE);
}
static const char oommsg[] = ": out of memory\n";
return p;
if (p)
return p;
write(STDERR_FILENO, program_invocation_short_name,
strlen(program_invocation_short_name));
write(STDERR_FILENO, oommsg, strlen(oommsg));
abort();
}
#define xmalloc(s) (fail_on_null(malloc(s), (s), __FILE__, __LINE__))
#define xzalloc(s) (fail_on_null(zalloc(s), (s), __FILE__, __LINE__))
#define xcalloc(n, s) (fail_on_null(calloc(n, s), (n) * (s), __FILE__, __LINE__))
#define xstrdup(s) (fail_on_null(strdup(s), 0, __FILE__, __LINE__))
#define xrealloc(p, s) (fail_on_null(realloc(p, s), (s), __FILE__, __LINE__))
#define xmalloc(s) (abort_oom_if_null(malloc(s)))
#define xzalloc(s) (abort_oom_if_null(zalloc(s)))
#define xcalloc(n, s) (abort_oom_if_null(calloc(n, s)))
#define xstrdup(s) (abort_oom_if_null(strdup(s)))
#define xrealloc(p, s) (abort_oom_if_null(realloc(p, s)))
#ifdef __cplusplus
}