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Diffstat (limited to 'include/traceevent/trace-seq.h')
| -rw-r--r-- | include/traceevent/trace-seq.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/include/traceevent/trace-seq.h b/include/traceevent/trace-seq.h new file mode 100644 index 0000000..217492f --- /dev/null +++ b/include/traceevent/trace-seq.h @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: LGPL-2.1 +/* + * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> + * + */ + +#ifndef _TRACE_SEQ_H +#define _TRACE_SEQ_H + +#include <stdarg.h> +#include <stdio.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/* ----------------------- trace_seq ----------------------- */ + +#ifndef TRACE_SEQ_BUF_SIZE +#define TRACE_SEQ_BUF_SIZE 4096 +#endif + +enum trace_seq_fail { + TRACE_SEQ__GOOD, + TRACE_SEQ__BUFFER_POISONED, + TRACE_SEQ__MEM_ALLOC_FAILED, +}; + +/* + * Trace sequences are used to allow a function to call several other functions + * to create a string of data to use (up to a max of PAGE_SIZE). + */ + +struct trace_seq { + char *buffer; + unsigned int buffer_size; + unsigned int len; + unsigned int readpos; + enum trace_seq_fail state; +}; + +void trace_seq_init(struct trace_seq *s); +void trace_seq_reset(struct trace_seq *s); +void trace_seq_destroy(struct trace_seq *s); + +extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...) + __attribute__ ((format (printf, 2, 3))); +extern int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args) + __attribute__ ((format (printf, 2, 0))); + +extern int trace_seq_puts(struct trace_seq *s, const char *str); +extern int trace_seq_putc(struct trace_seq *s, unsigned char c); + +extern void trace_seq_terminate(struct trace_seq *s); + +extern int trace_seq_do_fprintf(struct trace_seq *s, FILE *fp); +extern int trace_seq_do_printf(struct trace_seq *s); + +#ifdef __cplusplus +} +#endif + +#endif /* _TRACE_SEQ_H */ |