diff options
Diffstat (limited to 'lib/libc/sys/mmap.2')
| -rw-r--r-- | lib/libc/sys/mmap.2 | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/lib/libc/sys/mmap.2 b/lib/libc/sys/mmap.2 index 05f5b4f5ae85..54079688e84d 100644 --- a/lib/libc/sys/mmap.2 +++ b/lib/libc/sys/mmap.2 @@ -93,7 +93,7 @@ Pages may be executed. .Pp The .Fa flags -parameter specifies the type of the mapped object, mapping options and +argument specifies the type of the mapped object, mapping options and whether modifications made to the mapped copy of the page are private to the process or are to be shared with other references. Sharing, mapping type and options are specified in the @@ -109,7 +109,7 @@ The file descriptor used for creating must be \-1. The .Fa offset -parameter is ignored. +argument is ignored. .\".It Dv MAP_FILE .\"Mapped from a regular file or character-special device memory. .It Dv MAP_FIXED @@ -212,7 +212,9 @@ implies and .Fa offset of 0. +The .Fa fd +argument must be -1 and .Fa prot must include at least @@ -264,7 +266,7 @@ The flag .Dv PROT_READ was specified as part of the .Fa prot -parameter and +argument and .Fa fd was not open for reading. The flags @@ -275,33 +277,39 @@ were specified as part of the .Fa flags and .Fa prot -parameters and +argument and .Fa fd was not open for writing. .It Bq Er EBADF +The .Fa fd +argument is not a valid open file descriptor. .It Bq Er EINVAL .Dv MAP_FIXED was specified and the .Fa addr -parameter was not page aligned, or part of the desired address space +argument was not page aligned, or part of the desired address space resides out of the valid address space for a user process. .It Bq Er EINVAL -.Fa Len +The +.Fa len +argument was negative. .It Bq Er EINVAL .Dv MAP_ANON was specified and the .Fa fd -parameter was not -1. +argument was not -1. .It Bq Er EINVAL .Dv MAP_ANON has not been specified and .Fa fd did not reference a regular or character special file. .It Bq Er EINVAL -.Fa Offset +The +.Fa offset +argument was not page-aligned. (See .Sx BUGS @@ -310,7 +318,7 @@ below.) .Dv MAP_FIXED was specified and the .Fa addr -parameter was not available. +argument was not available. .Dv MAP_ANON was specified and insufficient memory was available. The system has reached the per-process mmap limit specified in the @@ -329,7 +337,9 @@ sysctl. .Xr getpagesize 3 , .Xr make.conf 5 .Sh BUGS +The .Fa len +argument is limited to 2GB. Mmapping slightly more than 2GB does not work, but it is possible to map a window of size (filesize % 2GB) for file sizes |