From a44631cd68deab2b5cc3316ed94998a44018bcfb Mon Sep 17 00:00:00 2001
From: Tilman Sauerbeck <tilman@code-monkey.de>
Date: Sat, 30 Jan 2016 09:57:39 +0100
Subject: revdep: When mmap()-ing a file, don't keep the fd around.

We can close the file as soon as mmap() succeeded.
---
 revdep/package.c |  9 ++++-----
 revdep/utility.c | 24 +++++++++++++-----------
 revdep/utility.h |  4 ++--
 3 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/revdep/package.c b/revdep/package.c
index 2385040..4acb723 100644
--- a/revdep/package.c
+++ b/revdep/package.c
@@ -26,7 +26,6 @@
 
 extern PackageList *packages_load_from_database(const char *path)
 {
-	int fd;
 	char *text;
 	unsigned int length;
 	char name[1024];
@@ -98,7 +97,7 @@ extern PackageList *packages_load_from_database(const char *path)
 		}
 	}
 
-	if(open_file_in_memory(path, &fd, &text, &length) == -1)
+	if(open_file_in_memory(path, &text, &length) == -1)
 	{
 		return NULL;
 	}
@@ -111,18 +110,18 @@ extern PackageList *packages_load_from_database(const char *path)
 	if(parse_file_in_memory(text, parse_callback) == -1)
 	{
 		packages_free(pkgs);
-		close_file_in_memory(fd, text, length);
+		close_file_in_memory(text, length);
 		return NULL;
 	}
 
 	if(pkgs->length == 0)
 	{
 		packages_free(pkgs);
-		close_file_in_memory(fd, text, length);
+		close_file_in_memory(text, length);
 		return NULL;
 	}
 
-	close_file_in_memory(fd, text, length);
+	close_file_in_memory(text, length);
 
 	return pkgs;
 }
diff --git a/revdep/utility.c b/revdep/utility.c
index fcf6b41..67247e1 100644
--- a/revdep/utility.c
+++ b/revdep/utility.c
@@ -143,46 +143,48 @@ extern unsigned int string_crc32(const char *s)
 	return hash;
 }
 
-extern int open_file_in_memory(const char *path, int *fd, char **text, unsigned int *length)
+extern int open_file_in_memory(const char *path, char **text, unsigned int *length)
 {
 	struct stat st;
+	int fd;
 
-	if(path == NULL || path[0] == '\0' || fd == NULL || text == NULL || length == NULL)
+	if(path == NULL || path[0] == '\0' || text == NULL || length == NULL)
 	{
 		errno = EINVAL;
 		return -1;
 	}
 
-	if((fd[0] = open(path, O_RDONLY)) == -1)
+	if((fd = open(path, O_RDONLY)) == -1)
 	{
 		return -1;
 	}
 
-	if(fstat(fd[0], &st) == -1)
+	if(fstat(fd, &st) == -1)
 	{
-		close(fd[0]);
+		close(fd);
 		return -1;
 	}
 
-	if((text[0] = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd[0], 0)) == NULL)
+	if((text[0] = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0)) == NULL)
 	{
-		close(fd[0]);
+		close(fd);
 		return -1;
 	}
 
+	// We don't need to keep the fd around.
+	close(fd);
+
 	length[0] = st.st_size;
 	
 	return 0;
 }
 
-extern void close_file_in_memory(int fd, char *text, unsigned int length)
+extern void close_file_in_memory(char *text, unsigned int length)
 {
-	if(fd == -1 || text == NULL || length == 0)
+	if(text == NULL || length == 0)
 		return;
 
 	munmap(text, length);
-
-	close(fd);
 }
 
 extern int parse_file_in_memory(char *text, parse_cb_t cb)
diff --git a/revdep/utility.h b/revdep/utility.h
index d98ade1..34c02b1 100644
--- a/revdep/utility.h
+++ b/revdep/utility.h
@@ -37,7 +37,7 @@ extern char *xstrdup(const char *in);
 extern void logger(int level, const char *fmt, ...) __attribute__((format(printf,2,3)));
 extern char *strtrim(char *s);
 extern unsigned int string_crc32(const char *s);
-extern int open_file_in_memory(const char *path, int *fd, char **text, unsigned int *length);
-extern void close_file_in_memory(int fd, char *text, unsigned int length);
+extern int open_file_in_memory(const char *path, char **text, unsigned int *length);
+extern void close_file_in_memory(char *text, unsigned int length);
 extern int parse_file_in_memory(char *text, parse_cb_t cb);
 extern int get_ld_for_file(const char *pkg, const char *path, const char **ld);
-- 
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