130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
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/*
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* gcov-pull - Request gcov data from server and write it to gcda files
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* Author: Anton Kuijsten
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <lib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <minix/gcov.h>
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#define BUFF_SZ (4 * 1024 * 1024) /* 4MB */
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int read_int(void);
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char *buff_p;
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/* helper function to read int from the buffer */
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int read_int(void)
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{
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int res;
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memcpy(&res, buff_p, sizeof(int));
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buff_p += sizeof(int);
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return res;
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}
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int main(int argc, char *argv[])
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{
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FILE *fd = NULL;
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int server_nr, command, size, result;
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char buff[BUFF_SZ]; /* Buffer for all the metadata and file data sent */
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if(argc!=2 || sscanf(argv[1], "%d", &server_nr)!=1) {
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fprintf(stderr, "Usage: %s <pid>\n", argv[0]);
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return 1;
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}
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/*
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When making a GCOV call to a server, the gcov library linked into
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the server will try to write gcov data to disk. This writing is
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normally done with calls to the vfs, using stdio library calls.
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This is not correct behaviour for servers, especially vfs itself.
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Therefore, the server catches those attempts. The messages used for
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this communication are stored in a buffer. When the gcov operation
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is done, the buffer is copied from the server to this user space,
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from where the calls are finally made to the vfs. GCOV calls to the
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various servers are all routed trough vfs. For more information, see
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the <minix/gcov.h> header file.
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*/
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/* visit complete buffer, so vm won't has to
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manage the pages while flushing
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*/
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memset(buff, 'a', sizeof(buff));
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buff_p = buff;
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result = gcov_flush_svr(buff_p, BUFF_SZ, server_nr);
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if(result >= BUFF_SZ) {
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fprintf(stderr, "Too much data to hold in buffer: %d\n", result);
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fprintf(stderr, "Maximum: %d\n", BUFF_SZ);
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return 1;
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}
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if(result < 0) {
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fprintf(stderr, "Call failed\n");
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return 1;
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}
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/* At least GCOVOP_END opcode expected. */
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if(result < sizeof(int)) {
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fprintf(stderr, "Invalid gcov data from pid %d\n", server_nr);
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return 1;
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}
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/* Only GCOVOP_END is valid but empty. */
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if(result == sizeof(int)) {
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fprintf(stderr, "no gcov data.\n");
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return 0;
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}
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/* Iterate through the system calls contained in the buffer,
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* and execute them
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*/
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while((command=read_int()) != GCOVOP_END) {
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char *fn;
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switch(command) {
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case GCOVOP_OPEN:
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size = read_int();
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fn = buff_p;
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if(strchr(fn, '/')) {
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fn = strrchr(fn, '/');
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assert(fn);
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fn++;
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}
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assert(fn);
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if(!(fd = fopen(fn, "w+"))) {
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perror(buff_p);
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exit(1);
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}
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buff_p += size;
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break;
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case GCOVOP_CLOSE:
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if(!fd) {
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fprintf(stderr, "bogus close\n");
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exit(1);
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}
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fclose(fd);
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fd = NULL;
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break;
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case GCOVOP_WRITE:
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size = read_int();
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fwrite(buff_p, size, 1, fd);
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buff_p += size;
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break;
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default:
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fprintf(stderr, "bogus command %d in buffer.\n",
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command);
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exit(1);
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}
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}
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return 0;
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}
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