Difference between revisions of "Dbtlockf()"
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Yvonnemilne (Talk | contribs) |
Yvonnemilne (Talk | contribs) |
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| Line 11: | Line 11: | ||
<input parameter> | <input parameter> | ||
| − | char *dbf; /* File descriptor of a .DBF file to be locked */ | + | char *dbf; /* File descriptor of a .DBF file to be locked */ |
<output parameter> | <output parameter> | ||
| Line 39: | Line 39: | ||
#include "dbl.h" | #include "dbl.h" | ||
| − | char *dbf; /* Database file descriptor */ | + | char *dbf; /* Database file descriptor */ |
| − | int rc; /* Return code | + | int rc; /* Return code */ |
rc = dbtlockf(dbf); | rc = dbtlockf(dbf); | ||
| − | if (rc = SUCCESS) printf("file is locked n"); | + | if (rc == SUCCESS) printf("file is locked \n"); |
else { | else { | ||
| − | printf("file could not be locked n"); | + | printf("file could not be locked \n"); |
return (ERROR); | return (ERROR); | ||
} | } | ||
Latest revision as of 15:40, 1 May 2009
PURPOSE
test for a lock on a database file
SYNOPSIS
#include "dbl.h" int dbtlock(dbf) <input parameter> char *dbf; /* File descriptor of a .DBF file to be locked */ <output parameter> none
RETURN VALUE
The dbtlockf() function returns 0 for success, or < 0 if an error occurs. See the section on return values for a detailed list of return codes.
DESCRIPTION
The dbtlockf() function tests to see if a database file is already locked by another user.
EXAMPLE
The following example test locks the .DBF file whose file descriptor is in "char *dbf".
#include "dbl.h" char *dbf; /* Database file descriptor */ int rc; /* Return code */ rc = dbtlockf(dbf); if (rc == SUCCESS) printf("file is locked \n"); else { printf("file could not be locked \n"); return (ERROR); }
SEE ALSO
dbfilemode(), dblockf(), dblocki(), dblockr(), dbunlockf(), dbunlocki(), dbunlockr()
