SFS_TYPE

SFS_TYPE

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How to determine free disk space

port, edit sendmail/conf.h

The sendmail program can temporarily fail incoming mail messages if they are too large for the queueing disk. This ability is enabled by giving a positive, non-zero size to the MinFreeBlocks option (See this section). The method sendmail uses to measure the free space on a disk varies from system to system. This SFS_TYPE compile-time macro defines which of several methods sendmail will use. Those available are shown in Table 3-11.

Table 3-11. Method to determine free disk space

Compile-time macro	Description
SFS_NONE	Your system has no way to determine the free space on a disk. This causes the MinFreeBlocks option (MinFreeBlocks) to be ignored.
SFS_USTAT	Your system uses the ustat (2) system call to get information about mounted filesystems.
SFS_4ARGS	Your system uses the four-argument form of the statfs (2) system call and < sys/statfs.h >. If you define this, you can also define SFS_BAVAIL as the field name for the statfs C-language structure (by default, f_bavail ).
SFS_VFS	Your system uses the two-argument form of the statfs (2) system call and < sys/vfs.h >.
SFS_MOUNT	Your system uses the two-argument form of the statfs (2) system call and < sys/mount.h >.
SFS_STATFS	Your system uses the two-argument form of the statfs (2) system call and < sys/statfs.h >.
SFS_STATVFS	Your system uses the statvfs (2) system call.

In general, SFS_TYPE is correctly defined for all supported systems. You should need to modify it only if you are porting to a new system. To do so, you will need to edit sendmail/conf.h ( include/sm/conf.h beginning with V8.12).

You can use the -d4.80 debugging switch (-d4.80) to watch sendmail check for enough disk space. The only way to tell whether a precompiled version of sendmail has this ability is by setting the MinFreeBlocks option to a positive value and watching the -d4.80 output. If bavail= in that output is always -1 , no matter what, your support was defined as SFS_NONE.

New ports should be reported to [e-mail] so that they can be folded into future releases.