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Share file offset across processes

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This change ensures that if a file descriptor for an open disk file gets
shared by multiple processes within a process tree, then lseek() changes
will be visible across processes, and read() / write() are synchronized.
Note this only applies to Windows, because UNIX kernels already do this.
This commit is contained in:
Justine Tunney 2024-08-03 01:24:46 -07:00
parent a80ab3f8fe
commit 761c6ad615
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GPG key ID: BE714B4575D6E328
15 changed files with 256 additions and 63 deletions
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test/libc/intrin/munmap_test.c
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@ -185,8 +185,8 @@ TEST(munmap, tinyFile_preciseUnmapSize) {
TEST(munmap, tinyFile_mapThriceUnmapOnce) {
char *p;
ASSERT_NE(MAP_FAILED, (p = mmap(0, gransz*5, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)));
ASSERT_SYS(0, 0, munmap(p, gransz*5));
ASSERT_SYS(0, 3, open("doge", O_RDWR | O_CREAT | O_TRUNC, 0644));
ASSERT_SYS(0, 0, munmap(p, gransz*5));
ASSERT_SYS (0, 5, write(3, "hello", 5));
ASSERT_EQ(p+gransz*0, mmap(p+gransz*0, gransz, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, -1, 0));
ASSERT_EQ(p+gransz*1, mmap(p+gransz*1, 5, PROT_READ, MAP_PRIVATE|MAP_FIXED, 3, 0));