/* * Copyright (C) 2009 Red Hat Inc, Steven Rostedt * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License (not later!) * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program; if not, see * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include #include #include #include #include #include "event-parse.h" #include "event-utils.h" /* * The TRACE_SEQ_POISON is to catch the use of using * a trace_seq structure after it was destroyed. */ #define TRACE_SEQ_POISON ((void *)0xdeadbeef) #define TRACE_SEQ_CHECK(s) \ do { \ if (WARN_ONCE((s)->buffer == TRACE_SEQ_POISON, \ "Usage of trace_seq after it was destroyed")) \ (s)->state = TRACE_SEQ__BUFFER_POISONED; \ } while (0) #define TRACE_SEQ_CHECK_RET_N(s, n) \ do { \ TRACE_SEQ_CHECK(s); \ if ((s)->state != TRACE_SEQ__GOOD) \ return n; \ } while (0) #define TRACE_SEQ_CHECK_RET(s) TRACE_SEQ_CHECK_RET_N(s, ) #define TRACE_SEQ_CHECK_RET0(s) TRACE_SEQ_CHECK_RET_N(s, 0) /** * trace_seq_init - initialize the trace_seq structure * @s: a pointer to the trace_seq structure to initialize */ void trace_seq_init(struct trace_seq *s) { s->len = 0; s->readpos = 0; s->buffer_size = TRACE_SEQ_BUF_SIZE; s->buffer = malloc(s->buffer_size); if (s->buffer != NULL) s->state = TRACE_SEQ__GOOD; else s->state = TRACE_SEQ__MEM_ALLOC_FAILED; } /** * trace_seq_reset - re-initialize the trace_seq structure * @s: a pointer to the trace_seq structure to reset */ void trace_seq_reset(struct trace_seq *s) { if (!s) return; TRACE_SEQ_CHECK(s); s->len = 0; s->readpos = 0; } /** * trace_seq_destroy - free up memory of a trace_seq * @s: a pointer to the trace_seq to free the buffer * * Only frees the buffer, not the trace_seq struct itself. */ void trace_seq_destroy(struct trace_seq *s) { if (!s) return; TRACE_SEQ_CHECK_RET(s); free(s->buffer); s->buffer = TRACE_SEQ_POISON; } static void expand_buffer(struct trace_seq *s) { char *buf; buf = realloc(s->buffer, s->buffer_size + TRACE_SEQ_BUF_SIZE); if (WARN_ONCE(!buf, "Can't allocate trace_seq buffer memory")) { s->state = TRACE_SEQ__MEM_ALLOC_FAILED; return; } s->buffer = buf; s->buffer_size += TRACE_SEQ_BUF_SIZE; } /** * trace_seq_printf - sequence printing of trace information * @s: trace sequence descriptor * @fmt: printf format string * * It returns 0 if the trace oversizes the buffer's free * space, 1 otherwise. * * The tracer may use either sequence operations or its own * copy to user routines. To simplify formating of a trace * trace_seq_printf is used to store strings into a special * buffer (@s). Then the output may be either used by * the sequencer or pulled into another buffer. */ int trace_seq_printf(struct trace_seq *s, const char *fmt, ...) { va_list ap; int len; int ret; try_again: TRACE_SEQ_CHECK_RET0(s); len = (s->buffer_size - 1) - s->len; va_start(ap, fmt); ret = vsnprintf(s->buffer + s->len, len, fmt, ap); va_end(ap); if (ret >= len) { expand_buffer(s); goto try_again; } s->len += ret; return 1; } /** * trace_seq_vprintf - sequence printing of trace information * @s: trace sequence descriptor * @fmt: printf format string * * The tracer may use either sequence operations or its own * copy to user routines. To simplify formating of a trace * trace_seq_printf is used to store strings into a special * buffer (@s). Then the output may be either used by * the sequencer or pulled into another buffer. */ int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args) { int len; int ret; try_again: TRACE_SEQ_CHECK_RET0(s); len = (s->buffer_size - 1) - s->len; ret = vsnprintf(s->buffer + s->len, len, fmt, args); if (ret >= len) { expand_buffer(s); goto try_again; } s->len += ret; return len; } /** * trace_seq_puts - trace sequence printing of simple string * @s: trace sequence descriptor * @str: simple string to record * * The tracer may use either the sequence operations or its own * copy to user routines. This function records a simple string * into a special buffer (@s) for later retrieval by a sequencer * or other mechanism. */ int trace_seq_puts(struct trace_seq *s, const char *str) { int len; TRACE_SEQ_CHECK_RET0(s); len = strlen(str); while (len > ((s->buffer_size - 1) - s->len)) expand_buffer(s); TRACE_SEQ_CHECK_RET0(s); memcpy(s->buffer + s->len, str, len); s->len += len; return len; } int trace_seq_putc(struct trace_seq *s, unsigned char c) { TRACE_SEQ_CHECK_RET0(s); while (s->len >= (s->buffer_size - 1)) expand_buffer(s); TRACE_SEQ_CHECK_RET0(s); s->buffer[s->len++] = c; return 1; } void trace_seq_terminate(struct trace_seq *s) { TRACE_SEQ_CHECK_RET(s); /* There's always one character left on the buffer */ s->buffer[s->len] = 0; } int trace_seq_do_fprintf(struct trace_seq *s, FILE *fp) { TRACE_SEQ_CHECK(s); switch (s->state) { case TRACE_SEQ__GOOD: return fprintf(fp, "%.*s", s->len, s->buffer); case TRACE_SEQ__BUFFER_POISONED: fprintf(fp, "%s\n", "Usage of trace_seq after it was destroyed"); break; case TRACE_SEQ__MEM_ALLOC_FAILED: fprintf(fp, "%s\n", "Can't allocate trace_seq buffer memory"); break; } return -1; } int trace_seq_do_printf(struct trace_seq *s) { return trace_seq_do_fprintf(s, stdout); } c8da359a0347d75'>c8a6a09c1c617402cc9254b2bc8da359a0347d75 (diff)
Merge tag 'char-misc-4.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver fixes from Greg KH: "Here are some small char/misc driver fixes for 4.10-rc4 that resolve some reported issues. The MEI driver issue resolves a lot of problems that people have been having, as does the mem driver fix. The other minor fixes resolve other reported issues. All of these have been in linux-next for a while" * tag 'char-misc-4.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: vme: Fix wrong pointer utilization in ca91cx42_slave_get auxdisplay: fix new ht16k33 build errors ppdev: don't print a free'd string extcon: return error code on failure drivers: char: mem: Fix thinkos in kmem address checks mei: bus: enable OS version only for SPT and newer
Diffstat (limited to 'include/trace/events')