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Implement basic chmod() syscall and /bin/chmod helper.

Only raw octal modes are supported right now.
This patch also changes mode_t from 32-bit to 16-bit to match the on-disk
type used by Ext2FS.

I also ran into EPERM being errno=0 which was confusing, so I inserted an
ESUCCESS in its place.
This commit is contained in:
Andreas Kling 2019-01-29 04:55:08 +01:00
parent ad53f6afd3
commit c30e2c8d44
22 changed files with 156 additions and 4 deletions

1
Userland/.gitignore vendored
View file

@ -28,3 +28,4 @@ rm
cp
rmdir
dmesg
chmod

View file

@ -25,6 +25,7 @@ OBJS = \
cp.o \
rmdir.o \
dmesg.o \
chmod.o \
rm.o
APPS = \
@ -55,6 +56,7 @@ APPS = \
cp \
rmdir \
dmesg \
chmod \
rm
ARCH_FLAGS =
@ -159,6 +161,9 @@ rm: rm.o
rmdir: rmdir.o
$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
chmod: chmod.o
$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
.cpp.o:
@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<

27
Userland/chmod.cpp Normal file
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@ -0,0 +1,27 @@
#include <unistd.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv)
{
if (argc != 3) {
printf("usage: chmod <octal-mode> <path>\n");
return 1;
}
mode_t mode;
int rc = sscanf(argv[1], "%o", &mode);
if (rc != 1) {
perror("sscanf");
return 1;
}
rc = chmod(argv[2], mode);
if (rc < 0) {
perror("chmod");
return 1;
}
return 0;
}