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author | midipix <writeonce@midipix.org> | 2018-08-03 20:56:45 +0000 |
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committer | midipix <writeonce@midipix.org> | 2018-08-03 21:13:30 -0400 |
commit | a3e2cfa926e49bb4f63557bd990f83b8f4685734 (patch) | |
tree | 3edaf363a11a1fe1050780de272309ca0ac40db8 /src/helper | |
parent | 18a091990a2de49fb0c9d85b0ae8e86825f2104f (diff) | |
download | mdso-a3e2cfa926e49bb4f63557bd990f83b8f4685734.tar.bz2 mdso-a3e2cfa926e49bb4f63557bd990f83b8f4685734.tar.xz |
library interfaces: object file generation: simplify, re-implement with mmap.
Diffstat (limited to 'src/helper')
-rw-r--r-- | src/helper/mdso_create_output.c | 53 |
1 files changed, 48 insertions, 5 deletions
diff --git a/src/helper/mdso_create_output.c b/src/helper/mdso_create_output.c index 24ed757..39dd4d7 100644 --- a/src/helper/mdso_create_output.c +++ b/src/helper/mdso_create_output.c @@ -10,6 +10,7 @@ #include <stddef.h> #include <unistd.h> #include <fcntl.h> +#include <sys/mman.h> #include <mdso/mdso.h> #include "mdso_driver_impl.h" @@ -25,13 +26,40 @@ static int mdso_create_output( fddst = mdso_driver_fddst(dctx); if ((fdout = openat(fddst,name, - O_CREAT|O_TRUNC|O_WRONLY|O_NOCTTY|O_NOFOLLOW, - S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) < 0) + O_CREAT|O_TRUNC|O_WRONLY|O_NOCTTY|O_NOFOLLOW, + S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) < 0) return MDSO_SYSTEM_ERROR(dctx); return fdout; } +static int mdso_map_output( + const struct mdso_driver_ctx * dctx, + struct mdso_object * obj, + int fd) +{ + void * addr; + + if (ftruncate(fd,obj->size)) { + close(fd); + return MDSO_SYSTEM_ERROR(dctx); + } + + addr = mmap( + 0,obj->size, + PROT_WRITE,MAP_SHARED, + fd,0); + + close(fd); + + if (addr == MAP_FAILED) + return MDSO_SYSTEM_ERROR(dctx); + + obj->addr = addr; + + return 0; +} + static FILE * mdso_create_output_stream( const struct mdso_driver_ctx * dctx, const char * name) @@ -51,6 +79,21 @@ static FILE * mdso_create_output_stream( return fout; } +static int mdso_create_mapped_output( + const struct mdso_driver_ctx * dctx, + struct mdso_object * obj) +{ + int fd; + + if ((fd = mdso_create_output(dctx,obj->name)) < 0) + return MDSO_NESTED_ERROR(dctx); + + if (mdso_map_output(dctx,obj,fd) < 0) + return MDSO_NESTED_ERROR(dctx); + + return 0; +} + FILE * mdso_create_archive( const struct mdso_driver_ctx * dctx, const char * arname) @@ -67,9 +110,9 @@ int mdso_create_asmsrc( : mdso_driver_fdout(dctx); } -FILE * mdso_create_object( +int mdso_create_object( const struct mdso_driver_ctx * dctx, - const char * objname) + struct mdso_object * obj) { - return mdso_create_output_stream(dctx,objname); + return mdso_create_mapped_output(dctx,obj); } |