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ssp.c
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ssp.c
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/*
* SSP - Shell Script Profiler - Version 1.0
* Copyright (c) 2005 - Willy Tarreau <willy@w.ods.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Usage: ssp {e(nter) | l(eave)} <funcname> <dir> [ $? ];
* if <$?> is passed, the return code will be transferred.
*
* Stupid example :
*
* foo() {
* ssp enter $FUNCNAME /tmp
* sleep 1
* ssp leave $FUNCNAME /tmp
* return $1
* }
*
* bar() {
* ssp enter $FUNCNAME /tmp
* foo $2
* ssp leave $FUNCNAME /tmp $?
* return $?
* }
*
*
* Sort the stats:
* - by # of calls: grep '' *|tr ':' ' '|sed -e 's/\.sta//'|sort -n -k2.1
* - by total time: grep '' *|tr ':' ' '|sed -e 's/\.sta//'|sort -n -k3.1
* - by time/call : grep '' *|tr ':' ' '|sed -e 's/\.sta//'|sort -n -k4.1
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <sys/fcntl.h>
const char ssta[] = ".sta"; int lsta = sizeof(ssta);
const char sstr[] = ".str"; int lstr = sizeof(sstr);
const char slvl[] = ".lvl"; int llvl = sizeof(slvl);
#define MODE_ENTER 0
#define MODE_LEAVE 1
char *dir, *fct;
char *n_sta, *n_str, *n_lvl;
int mode;
int exit_code = 0;
// primitives
FILE *open_file(char *n) {
int fd;
FILE *f;
if ((fd = open(n, O_RDWR | O_CREAT, 0600)) == -1)
return NULL;
if ((f = fdopen(fd, "w+")) == NULL) {
close(fd);
return NULL;
}
return f;
}
/* if file <f> is NULL, then open file whose name is in <n>, otherwise
* use <f>. Then read <i> from the first line of the file. The file is
* returned in all cases (NULL if any error). <i> is set to 0 if the
* file cannot be read.
*/
FILE *read_int(FILE *f, char *n, int *i) {
int fd;
char s[16];
if (f == NULL) {
if ((f = open_file(n)) == NULL) {
close(fd);
*i = 0;
return NULL;
}
}
else
fseek(f, 0, SEEK_SET);
if (fgets((char *)&s, sizeof(s), f) != NULL && *s)
*i = atoi(s);
else
*i = 0;
return f;
}
/* if file <f> is NULL, then open file whose name is in <n>, otherwise
* use <f>. Then write <i> at the beginning of the file. The file is
* returned in all cases (NULL if any error).
*/
FILE *write_int(FILE *f, char *n, int i) {
int fd;
if (f == NULL) {
if ((f = open_file(n)) == NULL) {
close(fd);
return NULL;
}
}
else
fseek(f, 0, SEEK_SET);
fprintf(f, "%d\n", i);
return f;
}
// main functions
void process_enter() {
FILE *f_lvl, *f_str;
int lvl;
if ((f_lvl = read_int(NULL, n_lvl, &lvl)) == NULL)
return;
lvl++;
write_int(f_lvl, NULL, lvl);
if (lvl == 1) { // no recursion, count only the outer time
struct timeval tv;
f_str = open_file(n_str);
gettimeofday(&tv, NULL);
fprintf(f_str, "%u.%06u\n", tv.tv_sec, tv.tv_usec);
fclose(f_str);
}
fclose(f_lvl);
}
void process_leave() {
FILE *f_lvl, *f_str, *f_sta;
int lvl, cnt;
if ((f_lvl = read_int(NULL, n_lvl, &lvl)) == NULL)
return;
lvl--;
if (lvl > 0)
write_int(f_lvl, NULL, lvl);
else {
struct timeval tv1, tv2;
int fields;
gettimeofday(&tv2, NULL);
f_str = open_file(n_str);
fields = fscanf(f_str, "%u.%06u\n", &tv1.tv_sec, &tv1.tv_usec);
fclose(f_str);
if (fields == 2) { // %u.%u
tv2.tv_usec -= tv1.tv_usec;
tv2.tv_sec -= tv1.tv_sec;
while (tv2.tv_usec < 0 || tv2.tv_usec >= 1000000) {
tv2.tv_sec--;
tv2.tv_usec += 1000000;
}
// read previous elapsed time to add this one
f_sta = open_file(n_sta);
if (f_sta)
fields = fscanf(f_sta, "%u %u.%06u", &cnt, &tv1.tv_sec, &tv1.tv_usec);
else
fields = 0;
if (fields == 3) {
tv2.tv_sec += tv1.tv_sec;
tv2.tv_usec += tv1.tv_usec;
cnt++;
}
else
cnt = 1;
while (tv2.tv_usec >= 1000000) {
tv2.tv_sec++;
tv2.tv_usec -= 1000000;
}
fseek(f_sta, 0, SEEK_SET);
fprintf(f_sta, "%u %u.%06u %f\n", cnt, tv2.tv_sec, tv2.tv_usec,
((double)tv2.tv_sec+((double)tv2.tv_usec/1000000))/cnt);
fclose(f_sta);
unlink(n_str);
}
}
fclose(f_lvl);
if (lvl == 0)
unlink(n_lvl);
}
main(int argc, char **argv) {
int ldir, lfct;
if (argc < 4) {
printf("Usage: ssp {e(nter) | l(eave)} <funcname> <dir> [$?]\n");
exit(1);
}
fct = argv[2]; lfct = strlen(fct);
dir = argv[3]; ldir = strlen(dir);
if (argc > 4)
exit_code = atoi(argv[4]);
// dir "/" fct "." type
n_sta = (char *)malloc(ldir + 1 + lfct + lsta + 1);
sprintf(n_sta, "%s/%s%s", dir, fct, ssta);
n_str = (char *)malloc(ldir + 1 + lfct + lstr + 1);
sprintf(n_str, "%s/%s%s", dir, fct, sstr);
n_lvl = (char *)malloc(ldir + 1 + lfct + llvl + 1);
sprintf(n_lvl, "%s/%s%s", dir, fct, slvl);
if (argv[1][0] == 'e') // "enter"
process_enter();
else
process_leave();
return exit_code;
}