From bd826de2f539f2e48c8c01d2d7f9f34c7e97104a Mon Sep 17 00:00:00 2001
From: Samo Penic <samo.penic@gmail.com>
Date: Fri, 13 May 2016 07:43:27 +0000
Subject: [PATCH] Fix in trisurf output, inhibiting print of successful reconstruction. Multiple fixes and improvements in python module. Added symlinking of tapes into the running directories and dumping tapes from snapshots into tape files.
---
src/general.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 103 insertions(+), 0 deletions(-)
diff --git a/src/general.c b/src/general.c
index a600800..9782e47 100644
--- a/src/general.c
+++ b/src/general.c
@@ -1,3 +1,4 @@
+/* vim: set ts=4 sts=4 sw=4 noet : */
#include<stdio.h>
#include<stdlib.h>
#include "general.h"
@@ -7,6 +8,10 @@
#include <unistd.h>
#include <time.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
ts_uint ts_fprintf(FILE *fd, char *fmt, ...){
if(quiet) return TS_SUCCESS;
@@ -32,3 +37,101 @@
}
+/* Open/create the file named in 'pidFile', lock it, optionally set the
+ close-on-exec flag for the file descriptor, write our PID into the file,
+ and (in case the caller is interested) return the file descriptor
+ referring to the locked file. The caller is responsible for deleting
+ 'pidFile' file (just) before process termination. 'progName' should be the
+ name of the calling program (i.e., argv[0] or similar), and is used only for
+ diagnostic messages. If we can't open 'pidFile', or we encounter some other
+ error, then we print an appropriate diagnostic and terminate. */
+
+/*
+ This is filelock/create_pid_file.c (Listing 55-4, page 1143), an example program file from the book, The Linux Programming Interface.
+
+The source code file is copyright 2010, Michael Kerrisk, and is licensed under the GNU Lesser General Public License, version 3.
+*/
+
+#define BUF_SIZE 100
+int createPidFile(const char *progName, const char *pidFile, int flags)
+{
+ int fd;
+ char buf[BUF_SIZE];
+
+ fd = open(pidFile, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
+ if (fd == -1){
+ ts_fprintf(stderr,"Could not open PID file %s", pidFile);
+ fatal("Cannot continue (1)",1);
+}
+ if (flags & CPF_CLOEXEC) {
+
+ /* Set the close-on-exec file descriptor flag */
+
+ /* Instead of the following steps, we could (on Linux) have opened the
+ file with O_CLOEXEC flag. However, not all systems support open()
+ O_CLOEXEC (which was standardized only in SUSv4), so instead we use
+ fcntl() to set the close-on-exec flag after opening the file */
+
+ flags = fcntl(fd, F_GETFD); /* Fetch flags */
+ if (flags == -1){
+ ts_fprintf(stderr,"Could not get flags for PID file %s", pidFile);
+ fatal("Cannot continue (2)",1);
+}
+ flags |= FD_CLOEXEC; /* Turn on FD_CLOEXEC */
+
+ if (fcntl(fd, F_SETFD, flags) == -1) /* Update flags */
+ ts_fprintf(stderr,"Could not set flags for PID file %s", pidFile);
+ fatal("Cannot continue (3)",1);
+
+ }
+
+ if (lockRegion(fd, F_WRLCK, SEEK_SET, 0, 0) == -1) {
+ if (errno == EAGAIN || errno == EACCES){
+ ts_fprintf(stderr,"PID file '%s' is locked; probably "
+ "'%s' is already running", pidFile, progName);
+ fatal("Cannot continue (4)",1);
+}
+ else{
+ ts_fprintf(stderr,"Unable to lock PID file '%s'", pidFile);
+ fatal("Cannot continue (5)",1);
+}
+ }
+
+ if (ftruncate(fd, 0) == -1){
+ ts_fprintf(stderr,"Could not truncate PID file '%s'", pidFile);
+ fatal("Cannot continue (6)",1);
+}
+
+ snprintf(buf, BUF_SIZE, "%ld\n", (long) getpid());
+ if (write(fd, buf, strlen(buf)) != strlen(buf)){
+
+ ts_fprintf(stderr,"Writing to PID file '%s'", pidFile);
+ fatal("Cannot continue (7)",1);
+}
+ return fd;
+}
+
+
+
+/* Lock a file region (private; public interfaces below) */
+
+static int
+lockReg(int fd, int cmd, int type, int whence, int start, off_t len)
+{
+ struct flock fl;
+
+ fl.l_type = type;
+ fl.l_whence = whence;
+ fl.l_start = start;
+ fl.l_len = len;
+
+ return fcntl(fd, cmd, &fl);
+}
+
+
+int /* Lock a file region using nonblocking F_SETLK */
+lockRegion(int fd, int type, int whence, int start, int len)
+{
+ return lockReg(fd, F_SETLK, type, whence, start, len);
+}
+
--
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