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Fix writev() on the New Technology (#117)

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Justine Tunney 2021-03-09 11:21:08 -08:00
parent 6cd1037692
commit 83d0c3b870
8 changed files with 113 additions and 31 deletions
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70
test/libc/calls/writev_test.c Normal file
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@ -0,0 +1,70 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/struct/iovec.h"
#include "libc/errno.h"
#include "libc/macros.internal.h"
#include "libc/sock/sock.h"
#include "libc/sysv/consts/o.h"
#include "libc/testlib/testlib.h"
char testlib_enable_tmp_setup_teardown;
TEST(writev, test) {
int fd;
char ba[1] = "a";
char bb[1] = "b";
char bc[2] = "cd";
struct iovec iov[] = {{"", 0}, {ba, 1}, {NULL, 0}, {bb, 1}, {bc, 2}};
ASSERT_NE(-1, (fd = open("file", O_RDWR | O_CREAT | O_TRUNC, 0644)));
EXPECT_EQ(4, writev(fd, iov, ARRAYLEN(iov)));
EXPECT_EQ(1, lseek(fd, 1, SEEK_SET));
EXPECT_EQ(3, readv(fd, iov, ARRAYLEN(iov)));
EXPECT_EQ('b', ba[0]);
EXPECT_EQ('c', bb[0]);
EXPECT_EQ('d', bc[0]);
EXPECT_NE(-1, close(fd));
}
TEST(writev, big_fullCompletion) {
int fd;
char *ba = malloc(2 * 1024 * 1024);
char *bb = malloc(2 * 1024 * 1024);
char *bc = malloc(2 * 1024 * 1024);
struct iovec iov[] = {
{"", 0}, //
{ba, 2 * 1024 * 1024}, //
{NULL, 0}, //
{bb, 2 * 1024 * 1024}, //
{bc, 2 * 1024 * 1024}, //
};
ASSERT_NE(-1, (fd = open("file", O_RDWR | O_CREAT | O_TRUNC, 0644)));
EXPECT_EQ(6 * 1024 * 1024, writev(fd, iov, ARRAYLEN(iov)));
EXPECT_NE(-1, close(fd));
}
TEST(writev, empty_stillPerformsIoOperation) {
int fd;
struct iovec iov[] = {{"", 0}, {NULL, 0}};
ASSERT_NE(-1, touch("file", 0644));
ASSERT_NE(-1, (fd = open("file", O_RDONLY)));
EXPECT_EQ(-1, writev(fd, iov, ARRAYLEN(iov)));
EXPECT_EQ(-1, writev(fd, NULL, 0));
EXPECT_NE(-1, close(fd));
}

2
test/libc/stdio/spawn_test.c
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@ -61,7 +61,7 @@ const char kTinyLinuxExit[128] = {
0x7f, 0x45, 0x4c, 0x46, 0x02, 0x01, 0x01, 0x00, // ⌂ELF☻☺☺ 
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //         
0x02, 0x00, 0x3e, 0x00, 0x01, 0x00, 0x00, 0x00, // ☻ > ☺   
0x78, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, // x @     
0x78, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, // x @     
0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // @       
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //         
0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x38, 0x00, //     @ 8