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Start adding a basic /proc filesystem and a "ps" utility.

This commit is contained in:
Andreas Kling 2018-10-23 11:57:38 +02:00
parent 98f76f0153
commit ed2422d7af
13 changed files with 139 additions and 23 deletions

1
Userland/.gitignore vendored
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@ -1,3 +1,4 @@
id
sh
ps
*.o

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@ -1,10 +1,12 @@
OBJS = \
id.o \
sh.o
sh.o \
ps.o
APPS = \
id \
sh
sh \
ps
ARCH_FLAGS =
STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib
@ -30,6 +32,9 @@ id: id.o
sh: sh.o
$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
ps: ps.o
$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
.cpp.o:
@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<

25
Userland/ps.cpp Normal file
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@ -0,0 +1,25 @@
#include <LibC/stdio.h>
#include <LibC/unistd.h>
int main(int c, char** v)
{
int fd = open("/proc/summary");
if (fd == -1) {
printf("failed to open /proc/summary :(\n");
return 1;
}
for (;;) {
char buf[16];
ssize_t nread = read(fd, buf, sizeof(buf));
if (nread == 0)
break;
if (nread < 0) {
printf("failed to read :(\n");
return 2;
}
for (ssize_t i = 0; i < nread; ++i) {
putchar(buf[i]);
}
}
return 0;
}