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[zstd] Fix rare bug with signal handler

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This commit is contained in:
Nick Terrell 2017-11-17 16:38:56 -08:00
parent c8b3e08535
commit a6052af0e8
1 changed files with 35 additions and 17 deletions
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52
programs/fileio.c
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@ -141,6 +141,21 @@ static void INThandler(int sig)
DISPLAY("\n");
exit(2);
}
static void addHandler(char const* dstFileName)
{
if (UTIL_isRegularFile(dstFileName)) {
g_artefact = dstFileName;
signal(SIGINT, INThandler);
} else {
g_artefact = NULL;
}
}
/* Idempotent */
static void clearHandler(void)
{
if (g_artefact) signal(SIGINT, SIG_DFL);
g_artefact = NULL;
}
/* ************************************************************
@ -841,6 +856,10 @@ static int FIO_compressFilename_srcFile(cRess_t ress,
fclose(ress.srcFile);
if (g_removeSrcFile /* --rm */ && !result && strcmp(srcFileName, stdinmark)) {
/* We must clear the handler, since after this point calling it would
* delete both the source and destination files.
*/
clearHandler();
if (remove(srcFileName))
EXM_THROW(1, "zstd: %s: %s", srcFileName, strerror(errno));
}
@ -863,18 +882,16 @@ static int FIO_compressFilename_dstFile(cRess_t ress,
ress.dstFile = FIO_openDstFile(dstFileName);
if (ress.dstFile==NULL) return 1; /* could not open dstFileName */
if (UTIL_isRegularFile(dstFileName)) {
g_artefact = dstFileName;
signal(SIGINT, INThandler);
} else {
g_artefact = NULL;
}
/* Must ony be added after FIO_openDstFile() succeeds.
* Otherwise we may delete the destination file if at already exists, and
* the user presses Ctrl-C when asked if they wish to overwrite.
*/
addHandler(dstFileName);
if (strcmp (srcFileName, stdinmark) && UTIL_getFileStat(srcFileName, &statbuf))
stat_result = 1;
result = FIO_compressFilename_srcFile(ress, dstFileName, srcFileName, compressionLevel);
clearHandler();
if (fclose(ress.dstFile)) { /* error closing dstFile */
DISPLAYLEVEL(1, "zstd: %s: %s \n", dstFileName, strerror(errno));
@ -887,8 +904,6 @@ static int FIO_compressFilename_dstFile(cRess_t ress,
else if (strcmp (dstFileName, stdoutmark) && stat_result)
UTIL_setFileStat(dstFileName, &statbuf);
signal(SIGINT, SIG_DFL);
return result;
}
@ -1552,6 +1567,10 @@ static int FIO_decompressSrcFile(dRess_t ress, const char* dstFileName, const ch
if ( g_removeSrcFile /* --rm */
&& (result==0) /* decompression successful */
&& strcmp(srcFileName, stdinmark) ) /* not stdin */ {
/* We must clear the handler, since after this point calling it would
* delete both the source and destination files.
*/
clearHandler();
if (remove(srcFileName)) {
/* failed to remove src file */
DISPLAYLEVEL(1, "zstd: %s: %s \n", srcFileName, strerror(errno));
@ -1575,18 +1594,17 @@ static int FIO_decompressDstFile(dRess_t ress,
ress.dstFile = FIO_openDstFile(dstFileName);
if (ress.dstFile==0) return 1;
if (UTIL_isRegularFile(dstFileName)) {
g_artefact = dstFileName;
signal(SIGINT, INThandler);
} else {
g_artefact = NULL;
}
/* Must ony be added after FIO_openDstFile() succeeds.
* Otherwise we may delete the destination file if at already exists, and
* the user presses Ctrl-C when asked if they wish to overwrite.
*/
addHandler(dstFileName);
if ( strcmp(srcFileName, stdinmark)
&& UTIL_getFileStat(srcFileName, &statbuf) )
stat_result = 1;
result = FIO_decompressSrcFile(ress, dstFileName, srcFileName);
clearHandler();
if (fclose(ress.dstFile)) {
DISPLAYLEVEL(1, "zstd: %s: %s \n", dstFileName, strerror(errno));