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kaf24@firebug.cl.cam.ac.uk
bddd41366d
connection, plus interleaving of transactional and non-transactional accesses. A transaction identifier is added to the xsd_sockmsg header structure (0 means 'not in context of a transaction'). The user and kernel xs interfaces accept a pointer to a transaction handle where appropriate -- currently this is directly cast to an integer identifier in the client library / kernel driver, but will allow for keeping extra dynamic client-side state in future if we need to. The transaction mutex has now gone. It's replaced with a read-write mutex, but this is only acquired for exclusive access during suspend/resume, to ensure there are no in-progress transactions. Signed-off-by: Keir Fraser <keir@xensource.com>
89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
#ifndef _UTILS_H
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#define _UTILS_H
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#include <stdbool.h>
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#include <string.h>
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#include <stdint.h>
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/* Is A == B ? */
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#define streq(a,b) (strcmp((a),(b)) == 0)
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/* Does A start with B ? */
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#define strstarts(a,b) (strncmp((a),(b),strlen(b)) == 0)
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/* Does A end in B ? */
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static inline bool strends(const char *a, const char *b)
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{
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if (strlen(a) < strlen(b))
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return false;
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return streq(a + strlen(a) - strlen(b), b);
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}
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
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#define ___stringify(x) #x
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#define __stringify(x) ___stringify(x)
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/* Convenient wrappers for malloc and realloc. Use them. */
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#define new(type) ((type *)malloc_nofail(sizeof(type)))
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#define new_array(type, num) realloc_array((type *)0, (num))
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#define realloc_array(ptr, num) ((__typeof__(ptr))_realloc_array((ptr), sizeof((*ptr)), (num)))
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void *malloc_nofail(size_t size);
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void *realloc_nofail(void *ptr, size_t size);
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void *_realloc_array(void *ptr, size_t size, size_t num);
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void barf(const char *fmt, ...) __attribute__((noreturn));
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void barf_perror(const char *fmt, ...) __attribute__((noreturn));
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/* This version adds one byte (for nul term) */
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void *grab_file(const char *filename, unsigned long *size);
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void release_file(void *data, unsigned long size);
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/* Signal handling: returns fd to listen on. */
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int signal_to_fd(int signal);
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void close_signal(int fd);
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void xprintf(const char *fmt, ...);
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#define eprintf(_fmt, _args...) xprintf("[ERR] %s" _fmt, __FUNCTION__, ##_args)
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#define iprintf(_fmt, _args...) xprintf("[INF] %s" _fmt, __FUNCTION__, ##_args)
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#ifdef DEBUG
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#define dprintf(_fmt, _args...) xprintf("[DBG] %s" _fmt, __FUNCTION__, ##_args)
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#else
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#define dprintf(_fmt, _args...) ((void)0)
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#endif
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/*
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* Mux errno values onto returned pointers.
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*/
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static inline void *ERR_PTR(long error)
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{
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return (void *)error;
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}
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static inline long PTR_ERR(const void *ptr)
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{
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return (long)ptr;
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}
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static inline long IS_ERR(const void *ptr)
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{
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return ((unsigned long)ptr > (unsigned long)-1000L);
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}
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#endif /* _UTILS_H */
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/*
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* Local variables:
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* c-file-style: "linux"
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* indent-tabs-mode: t
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* c-indent-level: 8
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* c-basic-offset: 8
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* tab-width: 8
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* End:
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*/
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