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Additional comments explaining what unixIsSharingShmNode() does. No

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changes to code.

FossilOrigin-Name: 819fc87385fd5be8a847492478f4c4f247f64edf7c7161b641bfbac6b658bec5
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drh
2025-10-28 01:28:20 +00:00
parent db0d47b749
commit 6cc222c3be
3 changed files with 21 additions and 7 deletions
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C Omit\sunnecessary\sbranches\sfrom\sthe\sunixIsSharingShmNode()\simplementation. C Additional\scomments\sexplaining\swhat\sunixIsSharingShmNode()\sdoes.\s\sNo\nchanges\sto\scode.
D 2025-10-27T23:57:57.385 D 2025-10-28T01:28:20.819
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@@ -720,7 +720,7 @@ F src/os.h 1ff5ae51d339d0e30d8a9d814f4b8f8e448169304d83a7ed9db66a65732f3e63
F src/os_common.h 6c0eb8dd40ef3e12fe585a13e709710267a258e2c8dd1c40b1948a1d14582e06 F src/os_common.h 6c0eb8dd40ef3e12fe585a13e709710267a258e2c8dd1c40b1948a1d14582e06
F src/os_kv.c fb7ba8d6204197357f1eb7e1c7450d09c10043bf7e99aba602f4aa46b8fb11a3 F src/os_kv.c fb7ba8d6204197357f1eb7e1c7450d09c10043bf7e99aba602f4aa46b8fb11a3
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F src/os_unix.c 46cf48c94280f44e98a58f366b81e27c736b50965a6b72f1099fdb5510f25059 F src/os_unix.c d4fd1c9bd8948c07071fbf5e4ef827f249b9075f31d3706ecc6481ed4e0ba46d
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@@ -2171,8 +2171,8 @@ F tool/version-info.c 33d0390ef484b3b1cb685d59362be891ea162123cea181cb8e6d2cf6dd
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F tool/warnings.sh 1ad0169b022b280bcaaf94a7fa231591be96b514230ab5c98fbf15cd7df842dd F tool/warnings.sh 1ad0169b022b280bcaaf94a7fa231591be96b514230ab5c98fbf15cd7df842dd
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# Remove this line to create a well-formed Fossil manifest. # Remove this line to create a well-formed Fossil manifest.

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src/os_unix.c
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@@ -4651,6 +4651,20 @@ static int unixFcntlExternalReader(unixFile *pFile, int *piOut){
** then return true. Return false if either pFile does not have a -shm ** then return true. Return false if either pFile does not have a -shm
** file open or if it is the only connection to that -shm file across the ** file open or if it is the only connection to that -shm file across the
** entire system. ** entire system.
**
** This routine is not required for correct operation. It can always return
** false and SQLite will continue to operate according to spec. However,
** when this routine does its job, it adds extra robustness in cases
** where database file locks have been erroneously deleted in a WAL-mode
** database by doing close(open(DATABASE_PATHNAME)) or similar.
**
** With false negatives, SQLite still operates to spec, though with less
** robustness. With false positives, the last database connection on a
** WAL-mode database will fail to unlink the -wal and -shm files, which
** is annoying but harmless. False positives will also prevent a database
** connection from running "PRAGMA journal_mode=DELETE" in order to take
** the database out of WAL mode, which is perhaps more serious, but is
** still not a disaster.
*/ */
static int unixIsSharingShmNode(unixFile *pFile){ static int unixIsSharingShmNode(unixFile *pFile){
int rc; int rc;