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Properly document return value of strpos().

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This commit is contained in:
Bruce Momjian
2005-11-16 03:56:35 +00:00
parent e68974665b
commit 1cb945bd50
3 changed files with 21 additions and 20 deletions
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4
doc/src/sgml/func.sgml
View File

@ -1,5 +1,5 @@
<!-- <!--
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.291 2005/11/04 23:13:59 petere Exp $ $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.291.2.1 2005/11/16 03:56:33 momjian Exp $
PostgreSQL documentation PostgreSQL documentation
--> -->
@ -1483,7 +1483,7 @@ PostgreSQL documentation
<row> <row>
<entry><literal><function>strpos</function>(<parameter>string</parameter>, <parameter>substring</parameter>)</literal></entry> <entry><literal><function>strpos</function>(<parameter>string</parameter>, <parameter>substring</parameter>)</literal></entry>
<entry><type>text</type></entry> <entry><type>int</type></entry>
<entry> <entry>
Location of specified substring (same as Location of specified substring (same as
<literal>position(<parameter>substring</parameter> in <literal>position(<parameter>substring</parameter> in

3
src/tools/fsync/README
View File

@ -2,4 +2,5 @@ This program tests fsync. The tests are described as part of the program output
Usage: test_fsync [-f filename] [loops] Usage: test_fsync [-f filename] [loops]
Loops defaults to 1000. Loops defaults to 1000. The default output file is /var/tmp/test_fsync.out.
Consider that /tmp or /var/tmp might be memory-based file systems.

34
src/tools/fsync/test_fsync.c
View File

@ -59,7 +59,7 @@ main(int argc, char *argv[])
strout[i] = 'a'; strout[i] = 'a';
if ((tmpfile = open(filename, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR)) == -1) if ((tmpfile = open(filename, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
write(tmpfile, strout, WAL_FILE_SIZE); write(tmpfile, strout, WAL_FILE_SIZE);
fsync(tmpfile); /* fsync so later fsync's don't have to do it */ fsync(tmpfile); /* fsync so later fsync's don't have to do it */
close(tmpfile); close(tmpfile);
@ -70,7 +70,7 @@ main(int argc, char *argv[])
for (i = 0; i < loops; i++) for (i = 0; i < loops; i++)
{ {
if ((tmpfile = open(filename, O_RDWR)) == -1) if ((tmpfile = open(filename, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
write(tmpfile, strout, 8192); write(tmpfile, strout, 8192);
close(tmpfile); close(tmpfile);
} }
@ -87,12 +87,12 @@ main(int argc, char *argv[])
for (i = 0; i < loops; i++) for (i = 0; i < loops; i++)
{ {
if ((tmpfile = open(filename, O_RDWR)) == -1) if ((tmpfile = open(filename, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
write(tmpfile, strout, 8192); write(tmpfile, strout, 8192);
fsync(tmpfile); fsync(tmpfile);
close(tmpfile); close(tmpfile);
if ((tmpfile = open(filename, O_RDWR)) == -1) if ((tmpfile = open(filename, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
/* do nothing but the open/close the tests are consistent. */ /* do nothing but the open/close the tests are consistent. */
close(tmpfile); close(tmpfile);
} }
@ -106,12 +106,12 @@ main(int argc, char *argv[])
for (i = 0; i < loops; i++) for (i = 0; i < loops; i++)
{ {
if ((tmpfile = open(filename, O_RDWR)) == -1) if ((tmpfile = open(filename, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
write(tmpfile, strout, 8192); write(tmpfile, strout, 8192);
close(tmpfile); close(tmpfile);
/* reopen file */ /* reopen file */
if ((tmpfile = open(filename, O_RDWR)) == -1) if ((tmpfile = open(filename, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
fsync(tmpfile); fsync(tmpfile);
close(tmpfile); close(tmpfile);
} }
@ -124,7 +124,7 @@ main(int argc, char *argv[])
/* 16k o_sync write */ /* 16k o_sync write */
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG)) == -1) if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
gettimeofday(&start_t, NULL); gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++) for (i = 0; i < loops; i++)
write(tmpfile, strout, 16384); write(tmpfile, strout, 16384);
@ -136,7 +136,7 @@ main(int argc, char *argv[])
/* 2*8k o_sync writes */ /* 2*8k o_sync writes */
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG)) == -1) if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
gettimeofday(&start_t, NULL); gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++) for (i = 0; i < loops; i++)
{ {
@ -154,7 +154,7 @@ main(int argc, char *argv[])
#ifdef OPEN_DATASYNC_FLAG #ifdef OPEN_DATASYNC_FLAG
/* open_dsync, write */ /* open_dsync, write */
if ((tmpfile = open(filename, O_RDWR | O_DSYNC)) == -1) if ((tmpfile = open(filename, O_RDWR | O_DSYNC)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
gettimeofday(&start_t, NULL); gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++) for (i = 0; i < loops; i++)
write(tmpfile, strout, 8192); write(tmpfile, strout, 8192);
@ -169,7 +169,7 @@ main(int argc, char *argv[])
/* open_fsync, write */ /* open_fsync, write */
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG)) == -1) if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
gettimeofday(&start_t, NULL); gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++) for (i = 0; i < loops; i++)
write(tmpfile, strout, 8192); write(tmpfile, strout, 8192);
@ -182,7 +182,7 @@ main(int argc, char *argv[])
#ifdef HAVE_FDATASYNC #ifdef HAVE_FDATASYNC
/* write, fdatasync */ /* write, fdatasync */
if ((tmpfile = open(filename, O_RDWR)) == -1) if ((tmpfile = open(filename, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
gettimeofday(&start_t, NULL); gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++) for (i = 0; i < loops; i++)
{ {
@ -200,7 +200,7 @@ main(int argc, char *argv[])
/* write, fsync, close */ /* write, fsync, close */
if ((tmpfile = open(filename, O_RDWR)) == -1) if ((tmpfile = open(filename, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
gettimeofday(&start_t, NULL); gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++) for (i = 0; i < loops; i++)
{ {
@ -218,7 +218,7 @@ main(int argc, char *argv[])
#ifdef OPEN_DATASYNC_FLAG #ifdef OPEN_DATASYNC_FLAG
/* open_dsync, write */ /* open_dsync, write */
if ((tmpfile = open(filename, O_RDWR | O_DSYNC)) == -1) if ((tmpfile = open(filename, O_RDWR | O_DSYNC)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
gettimeofday(&start_t, NULL); gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++) for (i = 0; i < loops; i++)
{ {
@ -236,7 +236,7 @@ main(int argc, char *argv[])
/* open_fsync, write */ /* open_fsync, write */
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG)) == -1) if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
gettimeofday(&start_t, NULL); gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++) for (i = 0; i < loops; i++)
{ {
@ -252,7 +252,7 @@ main(int argc, char *argv[])
#ifdef HAVE_FDATASYNC #ifdef HAVE_FDATASYNC
/* write, fdatasync */ /* write, fdatasync */
if ((tmpfile = open(filename, O_RDWR)) == -1) if ((tmpfile = open(filename, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
gettimeofday(&start_t, NULL); gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++) for (i = 0; i < loops; i++)
{ {
@ -271,7 +271,7 @@ main(int argc, char *argv[])
/* write, fsync, close */ /* write, fsync, close */
if ((tmpfile = open(filename, O_RDWR)) == -1) if ((tmpfile = open(filename, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out"); die("Cannot open output file.");
gettimeofday(&start_t, NULL); gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++) for (i = 0; i < loops; i++)
{ {
@ -306,6 +306,6 @@ print_elapse(struct timeval start_t, struct timeval elapse_t)
void void
die(char *str) die(char *str)
{ {
fprintf(stderr, "%s", str); fprintf(stderr, "%s\n", str);
exit(1); exit(1);
} }