ben
/
mmap
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

wip

This commit is contained in:
Ben Harris 2016-10-02 15:35:02 -04:00
parent 9215caf9c5
commit 6864133d52
6 changed files with 50 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

BIN
mmapcp Normal file
View File

Binary file not shown.

81
mmapcp.cc
View File

@ -8,37 +8,52 @@
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
int s, d; int s, s2, d;
struct stat st; struct stat st;
void *sp, *dp; struct stat s2t;
s = open(argv[1], O_RDONLY); void *sp, *s2p, *dp;
if (s == -1) { s = open(argv[1], O_RDONLY);
perror("open source"); if (s == -1) {
exit(1); perror("open source");
} exit(1);
d = open(argv[2], O_RDWR | O_CREAT | O_TRUNC, 0644); }
if (d == -1) { s2 = open(argv[2], O_RDONLY);
perror("open destintation"); if (s2 == -1) {
exit(1); perror("open source2");
} exit(1);
if (fstat(s, &st)) { }
perror("stat source"); d = open(argv[3], O_RDWR | O_CREAT | O_TRUNC, 0644);
exit(1); if (d == -1) {
} perror("open destination");
if (ftruncate(d, st.st_size)) { exit(1);
perror("truncate destination"); }
exit(1); if (fstat(s, &st)) {
} perror("stat source");
sp = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, s, 0); exit(1);
if (sp == MAP_FAILED) { }
perror("map source"); if (fstat(s2, &s2t)) {
exit(1); perror("stat source2");
} exit(1);
dp = mmap(NULL, st.st_size, PROT_WRITE | PROT_READ, MAP_SHARED, d, 0); }
if (dp == MAP_FAILED) { if (ftruncate(d, st.st_size + s2t.st_size)) {
perror("map destintation"); perror("truncate destination");
exit(1); exit(1);
} }
memcpy(dp, sp, st.st_size); sp = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, s, 0);
return 0; if (sp == MAP_FAILED) {
perror("map source");
exit(1);
}
s2p = mmap(NULL, s2t.st_size, PROT_READ, MAP_SHARED, s2, 0);
if (s2p == MAP_FAILED) {
perror("map source2");
exit(1);
}
dp = mmap(NULL, st.st_size + s2t.st_size, PROT_WRITE | PROT_READ, MAP_SHARED, d, 0);
if (dp == MAP_FAILED) {
perror("map destination");
exit(1);
}
memcpy(dp, sp, st.st_size);
return 0;
} }

1
mymom Normal file
View File

@ -0,0 +1 @@
mymom

BIN
out Normal file
View File

Binary file not shown.

BIN
out.txt Normal file
View File

Binary file not shown.

1
urmom Normal file
View File

@ -0,0 +1 @@
urmom