libc: add procsetname()

2 files changed, 20 insertions, 0 deletions

diff --git a/sys/src/libc/9sys/mkfile b/sys/src/libc/9sys/mkfile
index 6963ebbf6..686a7bd49 100644
--- a/sys/src/libc/9sys/mkfile
+++ b/sys/src/libc/9sys/mkfile
@@ -31,6 +31,7 @@ OFILES=\
 	nulldir.$O\
 	postnote.$O\
 	privalloc.$O\
+	procsetname.$O\
 	pushssl.$O\
 	pushtls.$O\
 	putenv.$O\
diff --git a/sys/src/libc/9sys/procsetname.c b/sys/src/libc/9sys/procsetname.c
new file mode 100644
index 000000000..5a75b5147
--- /dev/null
+++ b/sys/src/libc/9sys/procsetname.c
@@ -0,0 +1,19 @@
+#include <u.h>
+#include <libc.h>
+
+void
+procsetname(char *fmt, ...)
+{
+	int fd, n;
+	char buf[128];
+	va_list arg;
+
+	snprint(buf, sizeof buf, "#p/%lud/args", (ulong)getpid());
+	if((fd = open(buf, OWRITE)) < 0)
+		return;
+	va_start(arg, fmt);
+	n = vsnprint(buf, sizeof buf, fmt, arg);
+	va_end(arg);
+	write(fd, buf, n+1);
+	close(fd);
+}